Year: 1892

page_text: Date of Application, 6th Dec., 1892-Accepted, 4th Feb., 1893
Philadelphia, United States of America, Machinist.
I, ALFRED JULIUS BOULT of 323 High Holborn in the County of Middlesex,
M.I. Mech. E., and Chartered Patent Agent, 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:-
This invention relates to that class of machines employed for printing oil-cloth
and has for its object to secure the utmost precision in the movement of the parts
to avoid accidents from the failure of the troughs to be arrested at the proper
times and to prevent the flow of the paints to the journals of the paint rollers, to
which end the parts of the machine are constructed as fully set forth hereinafter,
and as illustrated in the accompanying drawings in which :-
Figure 1 is an elevation of sufficient of an oil-cloth printing machine to illustrate
the improvements.
Figure 2 is a view illustrating the arrangement of the friction device.
Figure 3 is a plan view of the friction device.
Figure 4 is a view illustrating the governing device in part section.
Figure 5 is a sectional view of part of the governing device.
Figure 6 is an end view of the same.
Figure 7 is an enlarged section illustrating the end of the trough and the arrange-
ment to prevent the paint from passing through the journal bearing of the roller.
The frame A is suitably constructed to support the operative parts and has bearings
for the shafts 102, 98 and 116 the latter being one of the driving shafts and
imparting motion to a slotted lever 95 through the medium of a crank 96 the
said lever 95 being connected by a rod 97 with a rocking arm 99 upon the shaft 98
and the arm 99 having a pawl 100 which engages the teeth of a ratchet 101
connected with a gear 103 which meshes with the teeth of a gear 104 upon the
shaft 102.
A crank arm on the shaft 102 is connected by a rod 92 with the rock arm 93
which is connected by a connecting rod 94 with the adjacent trough U of a series
of troughs connected together, these troughs being paint troughs in which revolve
paint rolls E as fully set forth hereinafter.
The reciprocation of the arm 95 imparts movement to the pawl lever 99 and
feeds the ratchet wheel 101 and thereby imparts movements to the connected parts
and to the troughs. As these troughs are very heavy there being sometimes 8, 10,
or 12, of them and as they reciprocate back and forth from ten to fifteen times a
minute it is important to overcome the momentum, because a very slight extra
movement will be sufficient to put the parts out of time. Thus, if the trough is
not carried from beneath the printing block exactly at the right time the latter
may descend upon it and cause the destruction of some of the parts.
To prevent such a result my correspondent combines with the moving parts, for
instance with one of the swinging levers 93 of which there may be a pair, a governor
in which a fluid is made the means of gradually arresting the movement of the
parts at the exact point. Preferably this is a compressed air governor and as
shown, the construction, preferred to be employed, embodies an oscillating
cylinder 2, having trunnions rocking in brackets i connected to the frame and
in this cylinder slides a piston 4 the rod 3 of which is connected to the arm or

page_text: lever 93. At each end of the cylinder 2 is a port closed by an inlet valve 5 lifting
inward or upward and another port closed by an outlet valve 6 against which bears
a spring 7 with any suitable means for regulating the pressure of the spring. As
shown the spring 7 bears upon a shoulder of the valve 6 and also upon a cross
head 9 through which extend two screw bolts 8, 8 and nuts 10 10 on the threaded
ends of the latter serve to set in the cross-head 9 to compress the spring to any
desired extent.
The stem 12 of the valve 6 projects inward to such an extent that it will be
struck by the piston or a part thereof as the latter approaches the limit of its
movement.
The springs 7 are adjusted to exactly the tension desired so that as the troughs
approach the limit of their movements in either direction the air in the governor
will be compressed to the exact extent required to overcome the momentum of the
trough to bring them to rest at the exact points required. At the instant when
the troughs come to rest the piston 4 will strike the stem 12 of the valve 6 thereby
opening the same against the pressure of the springs 7 and at once relieving the
governor of the internal pressure so that there will be no tendency upon the part
of the compressed air to re-act and force the piston in an opposite direction. The
opening of the cylinder and the escape of the compressed air at the instant that
the trough reaches its proper position is of the utmost importance because if the
reaction of the air should throw the parts back to a very slight extent the
printing trough would be brought beneath the cross-head and something would
be broken.
By means of the governor constructed as set forth hereiubefore my correspondent
is enabled to secure such precision and exactness of action that it is possible to
drive the machine at a much higher rate of speed than has ever been practicable
before. If the ratchet wheel 101 and the connected parts were to move even to a
very slight extent short of or beyond their proper positions, the cross-head might
be brought down to mash the printing blocks upon the troughs.
To prevent such a result a braking mechanism that will clamp the parts in place
as soon as they reach their proper positions is made use of. Thus, a band wheel 130
is secured to the shaft 102 and a braking strap or band 131 is carried around a
portion of said wheel, one end of the strap being secured to a shaft d or at any
other fixed point, and the other end being fastened to an adjustable screw bar or
bolt extending through a bearing on a long lever 132 pivotted to the bar d, or
other suitable point, the said screw bolt carrying a nut 16 by means of which it
may be adjusted. By moving the bar 132 at the proper time the band may be
applied to the brake wheel so as to bring the latter at once to rest. Any suitable
means may be employed for actuating the lever 132 but as shown I make use of
a cam m upon the shaft 116 which engages with an anti-friction wheel at the end
of the lever 132 so as to raise the latter and apply the brake strap the moment
the arm 99 and pawl reach their forward position. Preferably the lever 132 is
made in the form of two parallel bars connected together by proper cross bolts
and carrying the cross piece 19 between them upon which bears the nut 16.
Much difficulty had been experienced in oil-cloth printing machines from the
passage of the paints from the troughs to the outer end through the journals, the
said paints composed of metallic oxides causing the journals to be cut very rapidly
and increasing the space through which the paints can leak.
To avoid this result the end of the paint roll is packed against a sleeve which
surrounds the journal so as to prevent the admission of any paint between the
sleeve and the journal. Thus as shown in Figure 7 the journal E of the paint
roll E' extends through a sleeve g which is fitted to an opening in the end bearing h
of the trough and through the sleeve g is extended an oiling pipe f. The end of
the sleeve bears against the packing a fitting an annular opening in the end of
the roll, and the sleeve is forced inward by any suitable device so as to maintain
close contact with this packing. As shown the device for forcing inward the
9
9

page_text: sleeve consists of an annular nut t upon the threaded outer end of the sleeve and
bearing against the outer wall or bracket w of the trough; instead of this a screw
bolt may bear against the end of the sleeve and force it inward, see dotted lines
Figure 7.
It has been found that this arrangement effectually prevents the leakage of paint
around the journal. While I have illustrated one form of fluid governor it will be
evident that the same result may be obtained with fluid governors of other forms
the material feature being the adjusting of the parts so as to bring the trough or
troughs to rest exactly in their right positions and without any tendency to recede
from these positions from any cause.
My correspondent does not limit himself to the precise construction and arrange-
ment of parts set forth.
Having now particularly described and ascertained the nature of the said inven-
tion as communicated to me by my foreign correspondent, and in what manner the
same is to be performed, I declare that what I claim is :-
1. The combination in an oil-cloth printing press of a series of troughs devices
for reciprocating the troughs a fluid governor connected with said devices and
means for relieving the governor of pressure when the troughs reach the limit of
their movement in either direction substantially as set forth.
2. The combination with the reciprocating troughs and operating devices of an
oil-cloth printing machine of a fluid governor comprising a cylinder and piston and
means for relieving the same of pressure when the troughs reach the limit of their
position in either direction substantially as set forth.
3. The combination with the reciprocating troughs and operating devices of a
fluid governor consisting of a cylinder piston and piston rod connected to a recipro-
cating part of the machine, inlet openings and valves at the opposite ends of the
cylinder outlet openings and valves at the opposite ends of the cylinder springs
bearing upon said outlet valves and means for opening the valves as the piston
reaches the limit of its movement in either direction substantially as set forth.
4. The combination of reciprocating troughs and operating devices cylinder
provided with a piston connected with part of the operating devices, and having
inlet and outlet openings and valves, springs bearing against the outlet valves and
means for compressing the springs and stems projecting from the outlet valves in
position to be struck by the piston substantially as set forth.
5. The combination with the reciprocating troughs and operating parts of an
oscillating cylinder having a piston connected with one of the reciprocating parts
of the machine inlet ports and valves outlet ports and valves and springs for varying
the pressure upon the outlet valve substantially as set forth.
6. The combination of the troughs the ratchet wheel and pawl and connections
for moving the troughs shafts 102 and 116 a band pulley on the shaft 102 and gears
between the latter shaft and the ratchet wheel a band adapted to said pulley and
carried by a lever and a' cam on the shaft 116 operating upon the free end of the
lever to reciprocate the same substantially as set forth.
7. The combination with the devices for reciprocating the trough of a band
wheel a lever composed of two parallel connected bars and provided with a band
arranged to bear upon said wheel and a shaft provided with a cam arranged to
operate the outer end of said lever substantially as set forth.
8. The combination of the paint trough roller and its journal of a sleeve
surrounding the journal and means for moving the sleeve longitudinally to bring
its inner end into contact with the end of the roller substantially as set forth.
9. The combination of the trough roller journal packing at the end of the roller
and sleeve surrounding the journal and means for bringing the sleeve against said
packing substantially as set forth.
10. The combination of the trough roller journal sleeve surrounding the journal
packing opposite the end of the sleeve and a screw nut at the outer end of the

page_text: sleeve arranged to bear against a bearing upon the trough substantially as set
forth.
; Dated this 24th day of November 1892.
W. P. THOMPSON & BOULT,
Of London, Liverpool, Manchester, and Nottingham,
Agents for the Applicant.