Improvements in Printing Presses.
Year: 1898

page_text: Date of Application, 15th Aug., 1898-Accepted, 18th Feb., 1899
COMPLETE DI MUITIATION
Improvements in Printing Presses.
I, REGINALD HADDAN, of the Firm of Herbert Haddan & Co., of 18, Bucking-
ham Street, Strand, London, Patent Agent, do hereby declare the nature of this
invention a communication to from abroad by Samuel Lewis Merchant, of 63,
Washington Street, Gloucester, Essex County, Massachusetts, in the United
States of America, Box Manufacturer, and in what manner the same is to be per-
formed, to be particularly described and ascertained in and by the following
statement:-
This invention relates to printing presses, and to that class of such presses
usually termed "job presses and that have fixed beds and vibrating platens;
and it consists in certain novel features of construction, arrangement, and com-
bination of parts for imparting to the platen a vibratory motion to and from the
bed or type form, with a dwell or standstill when farthest removed from said
bed or form, all of which will be readily understood by reference to the descrip
tion of the drawings and to the claims to be hereinafter given and in which my
invention is clearly pointed out.
Fig. 1 of the drawings is a side elevation of a printing press embodying my
invention with the several parts in position for feeding the paper to the platen.
Fig. 2 is a sectional elevation of so much of the same as is necessary to illustrate
my improvement, the cutting plane being on line ex on Fig. 1, and the several
parts being in position for giving the impression; and Fig. 3 is a vertical section
on line yy on Fig. 2.
In the drawings, A is the main frame of the machine having cast therewith
or secured thereto at A¹ the bed (not shown).
B is the platen, pivoted at a to said frame. C is the feed table, D the ink
distributing table bbbb the inking rollers, E the main driving shaft, F the
crank shaft, G the inking roller carrying frame, operated by the link G¹ and the
crank pins e set in the gear wheels H as shown, and I is one of the draw rods for
operating the platen through the oscillations of the rocket shaft J and the elbow
lever J carried thereby to the arm d of which said rod I is pivoted as shown.
To the arm of the elbow lever J' is pivoted one end of the link K, the opposite
end of which is pivoted to the lever L mounted upon the rocker shaft L¹ and
carrying near its free or movable end, but to one side of the rod e connecting said
lever to the link K the rod e' which passes through the slot f formed in the upper
end of the pitman M the lower end of which has a bearing upon the crank
ping of the crank shaft Fall as shown in Figs. 2 and 3.
The lower end of the link K has firmly secured upon each side thereof a cam h,
a portion of the periphery of which as at i is concentric to the axis of the pivotal
connection of said link to the lever L, and against which the periphery of the
ring like truck j mounted upon a hub one at each side of the pitman M and
surrounding the slot f impinges when the parts shown in Fig. 3 and along which
said trucks roll while the platen is moving away from the bed and effectually
locks the pivot or rod e in the outer end of the slot f a sufficient time to insure the

page_text: downward movement of the platen until the axes of the lever L and the pivotal
connections of the link K with the levers L and J¹ are in line as shown in Fig. 1
which occurs before the crank pin g has reached the upper dead point in its
revolution relative to the pitman M. At this point the trucks ; pass from the
concentric surfaces of the cams h to the concave surfaces of said cams and the
pitman M will continue to move upward until the crank pin g has reached the
dead point in its revolution and the lower end of the slot f has come into contact
or nearly so with the rod e as shown in dotted lines in Fig. 1 without affecting
the position of the platen, the peripheries of the trucks moving freely past the
cut away or concave sides of the cams h thereby permitting a movement of the
pitman without moving the platen. As the crank pin g continues its revolution
beyond its upper dead point, the pitman is moved downward until the upper end
of the slot comes in contact with the rod e¹ without moving the platen, so that
the platen remains in a state of rest during the upward and downward movements
of the pitman M for a distance equal to the lost motion in the slot f which slot
may be made of greater or less length according to the length of time that it
is desired to have the platen remain at rest for the purpose of feeding the paper.
It will be observed that at the time the upper end of the slot f comes in con-
tact with the rod el to move the platen toward the bed the pivotal connection of
the link with the lever L has to move through quite a long distance to move
the platen a very small distance and hence said platen is moved from its state
of rest without a shock or jar.
Having now particularly described and ascertained the nature of this invention
and in what manner the same is to be performed I declare that what I claim is:-
1. In combination with the crank shaft, platen and draw bars of a
printing press, a pivoted lever provided with two pivots or bearing
rods at or near its free or' movable end, a pitman connecting one
of said pivots or bearing rods with the crank pin of said crank
shaft and slotted to permit an endwise movement of said pitman upon said bear-
ing rod, an elbow lever connected by one arm to the platen draw bars, a link
connecting the other arm of said elbow lever to the other pivot or bearing rod
of the pivoted lever and a locking device consisting of a cam shaped disk rigidly
secured to the lower end of said link, and constructed and arranged to bear upon
the upper end of said pitman during a portion of the revolution of the crank
shaft and thereby maintain the pivotal connection to the slotted end of the pit-
man at the outer end of the slot and during another portion of the revolution of
the crank shaft to assume a position to allow said pitman to continue its move-
ment without acting upon said cam to give the required dwell to the platen.
2. In combination with the crank shaft, platen, and draw bars of a printing-
press, the pitman M provided with the slot f the pivoted lever L provided with the
pivot or bearing rods e and e¹, the elbow lever J', the link K, the cams h fixed
on said link K and the trucks jj all constructed arranged, and adapted to
operate substantially as and for the purposes described.
ד
1
170
7
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1000