Reciprocating Movement.
Year: 1887

page_text: Reciprocating Movement.
:
I, JOHN THOMSON of Brooklyn Kings County in the State of New York United
States of America, Engineer, do hereby declare the nature of this invention and
in what inanner the same is to be performed, to be particularly described and,
ascertained in and by the following statement:-
1
This invention relates to mechanical movements, and' the object thereof is to '
impart a coinbined rotary and reciprocating motion to any device where such may
be, desirable. The particular advantage of the device, however, consists in the ability
to change either the extent of the reciprocating action or the speed thereof with
respect to the rotary motion. I regard the device as particularly applicable in the
production of the irregular forins by the control of formers as used in lathes.
and milling-machines, and also for ink-mills and distributing cylinders of printing.
presses.
"
In the drawings herewith presented, illustrating my invention, I have chosen to
represent the same as applied to a hollow cylinder, such, for instance, as inight be
used in a printing-press.
Fig. 1 of said drawings is a vertical longitudinal section through the cylinder,
exposing the internal apparatus in elevation and section.
Fig. 2 is a transverse section on the line 2, viewed in the direction of arrows.
Fig. 3 is a right-hand end elevation with the standard removed, and
Fig. 4 is a detached view of a portion of cylinder, a section, of which is broken
away, the view being in the direction of arrow 5 of Fig. 1.
The general description and operation of the device are as follows:-
Mounted in standards, as 6 7, and free to rotate therein, is a shaft 8, on one end,
of which is fixedly mounted a gear-wheel 9, which is presumed to imesh with a'
main or primary driving-gear, as 10. Within the cylinder A are two arms or
webs, 11 12, in which are formed journal-bearings 13 14, for the shaft 8. The;
cylinder A is connected so as to have rotary movement with the shaft and a
Price 77

page_text: longitudinal reciprocating movement on the shaft by any suitable means. That shown,
which I have found exceedingly strong and efficient, consists in the boss 15, which is
formed as a part of the secondary gear 9, having two driving-pins 16 17, which are
fixedly mounted thereon and which project forward within the cylinder and have free
engagement with the bearings 18 18* formed in the arm 11. On the opposite end of
the shaft a sleeve 19 is secured, as by the set-bolt 20, upon one side of which is
formed a stud 21, and from the other side of which projects a counter-weight 22.
There is also freely mounted upon the shaft 8 a bevel-gear 23, but which is fixed
against rotation to the standard 7, as by the bolts 24.
Mounted upon the stud 21 of the sleeve is a bevel-gear adapted to engage the
fixed gear 23. On the outer surface of the gear 25 is formed a can-stud or wrist-
pin 26, which carries a friction-roller 27. When a stud is used it is set eccentric to
the axis of the gear 25, and may be adjustably nounted, so as to regulate the amount
of reciprocation of the cylinder. The said roller acts in the slot 28, formed by the
lugs 29 30, which project from the inner surface of the cylinder. Rotary motion
being imparted to the gear 9, the result will be as follows: The driving pins cause
the cylinder to rotate with the said gear, as also the shaft, the sleeve, and bevel-
gear 25, and, as the bevel-gear 23 is fixed against rotation, this causes the gear 25 to
partake of rotary notion upon its own axis, as well as to be carried in a circular path
with the shaft and cylinder. Strictly defined, it is an epicycle gear-train. Such
motion of the gear 25 causes the stud or wrist-pin 26 to follow the path indicated by
dotted line 31 of Fig. 4, thereby driving the cylinder back and forth upon the shaft,
as indicated by dotted lines 32, Fig. 1. To change the extent of the reciprocation of
the cylinder, it is simply necessary to increase or decrease the distance of the stud or
wrist-pin 26 from the centre of the gear 25. To change the number of reciprocations
of the cylinder to each complete rotation thereof, it is simply required to properly
proportion the relation of the gears to obtain the desired result. For instance, the
arrangement shown in the drawings gives for one complete rotation of the cylinder
approximately seventy three one-hundredths of the coinplete throw of the crank or
stud 26.
Where severe duty is required another stud may be formed on the sleeve in lieu of
the counterweight, and an additional gear with wrist-pin and friction-roller inay be
mounted thereon the duplicate of gear 25, the cylinder also having another slot
diametrically opposite from that shown in the drawings. In other words the cylinder
would then be reciprocated by a pair of gears, and so arranged the action would be
in its theoretically most perfect form.
As a whole, the operation of the device here illustrated and described is exceed-
ingly smooth at very fast rates of action and is simple and easy to construct.
The general arrangement and disposal of the parts here shown-that is, self-con-
tained within the cylinder-are also favorable for many purposes, as no extra space
outside is occupied by the device. When so arranged, to avoid any annoyance from
the working out of oil which may accumulate, I forin the cylinder with an inwardly-
projecting Hange 33, which thus acts to prevent the oil from escaping therefrom to
the limit of the depth of the said flange.
If it is desirable to discontinue the reciprocating actions at any time, it is only
necessary to remove the stop-bolts 24, in consequence of which the gear 23 will be
free to rotate with the shaft and cylinder, the gear 25 being thus not revolved upon
its own axis.
It is evident that the circular motion of the cylinder or roll might be obtained by
a key or feather fixed in the shaft operating in a slot in the bearings; but the pins
are the more preferable form of construction, in that a much greater area of bearing-
surface is obtained, and that, being farther from the centre, the pressure thereon is
very inch less, besides which they are more convenient to lubricate and cheaper to
construct.
While I have shown my invention as applied to one particular form of mechanism,
it is evident that the principles thereof may be applied to many and various forms
by those skilled in the art without material change.

page_text: 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
1. The combination, with a rotary shaft, of a cylinder mounted so as to rotate
therewith and free to reciprocate longitudinally thereon, a stationary gear, a gear
carried by the shaft moshing with said stationary goar, and an eccentric connection
between said gear and the cylinder, substantially as described.
2. The combination, with a rotary shaft, of a cylinder mounted so as to rotate
therewith and free to reciprocato longitudinally thereon and provided with engaging-
lugs, a stationary bevelled gear surrounding said shaft, a bevelled gear carried by the
shaft meshing with the stationary gear, and a pin mounted eccentrically on said gear,
substantially as described.
3. The combination, with a revolving shaft and a cylinder freely mounted thereon,
of a boss or hub, as 15, fixed on the shaft and provided with driving-pins, as 16 17,
thereby causing the rotation of the cylinder, while at the same time permitting it to
be reciprocated upon the shaft and driving-pins, substantially as described.
4. The combination, with a rotary shaft and a reciprocating cylinder mounted
thereon, said cylinder being provided with engaging lugs, of a fixed gear, a sleeve
carried by the shaft and provided with a bearing-pin, and a gear mounted on said
bearing-pin and having an eccentric stud, substantially as described.