Improvements in Printing Presses.
Year: 1891

page_text: Date of Application, 13th Apr., 1891
Complete Specification Left, 24th June, 1991-Accented, 25th July, 1891
PROVISIONAL SPECIFICATION.
Improvements in Printing Presses.
I, Jons EBENEZER BOUSFIELD, of the firm of G. F. Redfern & Co., the
General Patent Office, No. 4, South Street, Finsbury, in the County of Middlesex
Patent Agents, do hereby declare the nature of this invention, (a communication
from abroad by William H. Golding, of Forthill Square, Boston, Massachusetts,
United States of America,) to be as follows:-
This invention relates to printing presses of that class known as oscillating.
The objects of the invention and the construction, operation and advantages
thereof will appear in the following description.
In carrying out the invention the base of the machine is provided, between its
ends, with a box, the front wall of which is pivotted to serve as a door, a knob and
any ordinary spring-bolt or other fastening is provided, it may be at one or both
of the edges of the door to take into an aperture or apertures in the side wall of
the box, whereby the door can be retained in a closed position.
Within the base and above the box are drawer cleats on which the bottom board
of a drawer may slide. The front wall of the drawer is provided with a shoulder
having semi-circular or other recesses to receive the ends or journals of ink rollers.
In this instance also, the front wall is provided with an integral drawer pull, the
front wall being made of a single casting which projects to the rear in the forin
of a bracket, through which screws or bolts are passed into the bottom of the
drawer to secure the front wall in position.
The rear wall is made like the front wall with the exception that the drawer
pull is omitted from the casting.
By the construction thus far described, the space between the end walls and the
base is utilized not only in the form of a box, but also with a drawer specially adapted
for the reception and retention of the ink rollers by supporting them solely by
their journals, so that the body of the roll is not injured and all the rolls within
the drawer can be kept free from dust and cleanly.
Upon the base of the machine, and, by means of knife-edge projections, is
mounted a treadle, provided with a laterally projecting lug-embracing pocket on
each side, so that, by means of a connecting-rod and crank-arm, the main shaft of
the press may be rotated. This shaft is mounted in bearings arranged on the top
of the base and at each side thereof and carries a pinion which meshes with the
master gear of the press. A crank-shaft is mounted in a frame which is connected
to the base of the machine. The master gear is keyed to the crank-shaft.
A crank-rod is mounted on a pin projecting from the outer surface of the master
gear and serves, by a pivotal connection with the roller frame, to oscillate the said
frame on its pivotal bearing in the frame.
may be
The rear cross-bars of the roller-frame have formed thereon, or it
attached thereto, branches arranged substantially at a right angle to each other
and connected by a vertically and laterally curved slotted bridge, the slot of which
is designed to operate a pawl carrying bracket by means of a pin thereon which
projects into the said slot."
An ink disc supporting bracket is bolted to the top of the bed of the press and
substantially at the centre transversely of the platen. The bracket is of such a
shape as to bring the surface of the disc in line with the roll-track of the frame.
The spindle of the dise passes through bearings formed in the pawl bracket and in
bearings of the dise supporting bracket.
A pivotted cha-e latch is provided at the top of the bed, and is projected beyond
its nivat and connected with a coil-suring which is attached to a lug extending

page_text: from the ink disc bracket, so that by the said spring the latch is held in a position
to retain the chase against the platen and under so as to permit of raising the latch
for the removal of the chase.
The upper end of the pawl bracket is bifurcated to form two arms, the latter
extending beyond the former, so as to form an obstruction against which a stop on
the double pawl may abut.
These projections are on the tooth portion of the pawl, of which there are two,
and between the two there projects a reversing arm which is, during a movement
of the ink disc operated by a lug projecting from the lower surface of the disc, so
as to throw one of the teeth of the pawl out of operation and to bring the opposite
tooth into operation with a series of lugs forined on the under surface of the di-c
and constituting, what may be termed, the rack-teeth of the disc as they alone
operate in connection with the pawl proper.
The bridge on the roller frame is curved vertically for the purpose of maintaining
the pin on the pawl carrying bracket and its anti-friction roller, when employed
constantly, within the slot, and the lateral curvature of the bridge and of the slot
is for the purpose of oscillating the pawl bracket, in order that the bolt may travel
over the rack lugs in one direction and be brought against one of the said lugs, when
travelling in the opposite direction, so as to give motion to the ink disc to secure
a proper distribution of the ink upon the ink-rollers as they travel over the same.
When, during the return stroke of the bracket, in which is carried over one or
more of the rack lugs, the arm reaches the lug, then the said arm serves to swing
the pawl on its pivot so as to turn the tooth, which, during the preceding platen
stroke of the bracket, moves the disc away from, so as to pass over the adjacent
rack lug and to bring the opposite tooth towards the disc and in line with its
adjacent rack lug so that the said opposite tooth becomes for a time the platen
tooth of the pawl, whereby the disc is rotated in the opposite direction. There
being but one reversing lug it is apparent that the disc will be reversed at the end
of each substantially complete rotation
An ink fountain is mounted on a riser and secured by a bolt to an arm which
terminates in clamps, adapted to embrace a bracket above its bearing and to be
removably secured to the said bracket by means of a bolt passing through both of
the clamps which are extended beyond the bolt and adapted to abut against
each other.
The object of the riser is to elevate the ink fountain and its delivery roll above
and out of contact with the base of the ink disc, in order that the ink shall be
conveyed directly from the fountain to the ink roll of the press instead of to the
ink disc.
The fountain roll is provided with a rigidly mounted ratchet-wheel, and on the
shaft of the roll there is loosely mounted a pawl-lever carrying a pawl. A con-
necting-rod extends from the free end of the pawl-lever to a lug extending from
the roll frame, at such a distance from its pivot, as to give the desired throw of
the connecting-rod and to the bolt-lever. The connecting-rod is slotted to give a
period of rest between the movements of the pawl-lever.
The ink fountain embodies novel features of construction. It has a cover, a roll
cover, made as a part of and projecting from one of the roll bearing brackets, and
an opposite roll bearing bracket. These brackets are perforated, for the reception
of thumb-screws which are seated in lugs, formed at opposite sides of the fountain,
so that two of the said thumb--er wry to bind the part- together to permit of
their separation for cleaning and to regulate the quantity of ink delivered by the
roll. A bracket is provided having projecting therion and seated therein rigidly
pivotal rod, which passes through the upper ends of standards projecting upwardly
from the fountain bed.
The single pivot rad serves to connect the cover, the roll cover and the two roll
supporting brackets pivotally with the fountain body, as the said rod passes
through lugs formed on the cover, which lugs are arranged inside of the standards,
while the brackets are arranged outside of said standards; by drawing one of the

page_text: brackets away from the standards, the said parts may be entirely separated from
each other for cleaning purposes.
The roll fits ink-tight within the brackets and
beneath its cover aud against the outlet of the fountain body so that when the
parts are closed the quantity of ink delivered by the roll may be regulated by
means of screws.
A connecting rod is connected operatively with a connecting shaft by a divided
box and extends and is pivotally connected to rock arms pivotted in the frame.
The means for pivotally connecting the rod to the rock arms may be readily
extended from one to the other of the rock-arms, or the said arms may be
constructed with an integral cross-bar similar to the cross-bar of the roll frame.
Links serve to connect the rock-arms with the oscillatory platen support by
being pivotted in ears cast or otherwise formed at its lower extremity.
The platen support is a strong, heavy, substantially U-shaped casting having a
strengthening cross-bar extending from one arm of the U to the other and having
strengthening under each arm around the curves of the U. The support has a
pivot bearing and the head of the support is provided with strengthening ribs and
with perforations in which are seated the platen adjusting bolts which have a set
nut.
The platen proper is cast with the usual strengthening ribs and with pivot lugs
for the support and operation of the gripper shaft to which are secured grippers
and a gripper cam extended beyond its pivot for the connection of a gripper spring,
the other end of which is secured to any suitable fixed part. Thumb-screws
project through collars of the gripper fingers and into a slot in the gripper shaft
formed for longitudinal adjustment of the grippers upon the shaft. The platen is
also provided with an apertured lug through which a thumb-screw passes and is
threaded in a nut arranged above two longitudinal slotted platen gauges each of
which is provided at its upper end and on its lower surface and within its extreme
edge with a curved depending lug, against which the lower edge of the paper rests
when arranged on the gauge. The gauges may be adjusted by turning either the
head of the thumb-screw or the nut and by sliding the gauges along on the bolts
to determine the distance of their projection upwardly on the platen and also by
swinging the gauges on the bolt to determine the distance which they shall be
from each other. In this adjustment the curvature of the curved lug is advan-
tageous in giving a uniformly smooth surface for supporting the shaft in all
positions of adjustment of the gauges.
The throw off mechanism involves the following constructions. The platen
proper is connected with the platen support solely by springs which are at one end
secured to the support by bolts entering apertures in the support, the opposite end
of each spring is secured to the platen by bolts entering apertures formed in the
platen. Ordinary platen clamps are provided.
At one end of the platen and entering its edge there is seated a pivot for a
throw off lever. At its free end this lever is provided with a lug adapted to take
upon a slight projection formed on the edge of the platen and serving to removably
connect the free end of the lever against accidental displacement and yet permit of
its quick and ready detachment. Between the free end and the pivot of the
lever there projects inwardly between the platen and platen support a rod
upon which a link is mounted for reciprocation. At its opposite end it is
perforated at a right angle to the bearing for the rod for the reception of another
rod projecting from the cam frame of the throw off mechanism. This cam frame
is pivotted to the under surface of the platen, and is provided with recesses having
its walls bevelled inwardly from the lower to the upper surface of the frame for
the reception of similar bevelled wedges. These wedges are bevelled lengthwise
and have enlarged heads which, when the platen is in position to take an
impression from type on the bed, rest upon the bolts of the platen support. The
inner surface of each wedge is plain and takes bearing on the trued faces of lugs
formed at the intersection of two of the strengthening ribs of the platen.
By this construction as the platen is in position to take an impression when the

page_text: free end of the lever is connected therewith it can be quickly thrown off, as it is
approaching the bed, by simply grasping the handle of the free end of the lever
and quickly drawing it towards the operator the direction of the movement of the
platen assisting the operation. As the lever is drawn towards the operator the
cam frame is rotated on its pivot thereby withdrawing the thicker ends of the
wedges from between the platen and the bolts in its support. During this
movement of the cam frame, the link travels towards the fever on the rod by
reason of the curved path of the pin or rod on the cam frame about the pivot
from its end towards the frame, until it reaches a point opposite the pivot of the
frame when its travels away from said frame on the pin. By this construction of
throw off mechanism there is but one part to be seized by the operator and the
platen is practically locked beneath when " on or "off." Of course it is under-
stood that the springs permit of the change of the relative positions its relative
support and at the same time maintain a parallelism which would not be secured
by the mere pivotal connection and yet have such connection, constructed to
maintain parallelism between the platen and bed when the platen is "on", such
parallelisin will be immaterial when the platen is "off." Any ordinary pivotal
connection of the platen and support can, if desired, he substituted for the spring
connection herein disclosed so that the novel features of my throw off mechanism
are not limited in this particular.
:-
The operation of the parts which give motion to the platen and its support is as
follows The crank shaft is rotated by the master gear which is keyed thereto
and the said shaft gives oscillation to the rock arms thus giving oscillation of the
platen support by means of the intermediate links. When the platen is parallel
with the bed, the parts approach a straight line whereby rebounding of the platen
is prevented and a smooth reversal of the direction in its travel, that is, away
from the bed is secured.
Casting the lugs on the teeth of the double pawl renders the adjustment of the
pawl to co-operate with the frame and the rack lugs a simple matter in that after
being cast, and while assembling the parts, the lugs simply require, by grinding, a
reduction to such a length as to permit of a swinging movement of the bolt on its
pivot sufficient only to allow the tooth of the pawl to drop behind the rack lug
and at the same time to limit said movement so that the extreme end of the said
tooth shall not come into contact with the disc between the lug. The arm also
serves as a weight or counterbalance to maintain the idle tooth of the double
pawl away from the disc until the said arm reaches the reversing lug.
The ink fountain supporting arm is slotted to permit of such an adjustment
as will cause the inking roll of the fountain to project more or less over the ink
disc.
Datod the 13th day of dunil 1901
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in Printing Presses.
I, JOHN EBENEZER BOUSFIELD, of the firm of G. F. Redfern & Co., the
General Patent Office, No. 4, South Street, Finsbury, in the County of Middlesex,
Patent Agents, do hereby declare the nature of this invention, (a communication to
me by William H. Golding, of Forthill Square, Boston, Massachusetts, United
States of America) 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 printing presses of that class known as oscillating. The
objects of the invention and the construction, operation and advantages thereof will
appear in the following description.

page_text: supporting the same on the press.
Figure 3 is a detail in perspective of the ink well, the parts being shewn opened
or partially separated from each other.
Figure 4 is a side elevation of the platen and frame.
Figure 4 is a plan of the platen gauges.
Figure 5 is a plan of the oscillatory platen frame.
Figure 6 is a plan of the rear surface of the platen with the throw-off' mechanism
and with the gripper shaft and cam arranged therein.
Figure 7 is a detail in perspective (on an enlarged scale) of a portion of the
throw-off mechanism.
Figures 8 and 9 are respectively longitudinal and vertical sections of the throw-off
wedge.
Figure 10 is a side elevation of the ink disc pawl carrying bracket.
Figure 11 is a perspective view, and
Figure 12a front elevation of that portion of the roller frame which is provided
with a pawl bracket operating cam.
Like letters refer to like parts in all the figures.
In carrying out the invention the base A of the machine is provided, between its
ends, with a box A the front wall A of which is pivotted as at A³ to serve as a
door; a knob A and any ordinary spring-bolt or other fastening A' is provided;
it may be at one or both of the edges of the door to take into an aperture or
apertures A in the side wall of the box, whereby the door can be retained in a
closed position.
Within the base and above the box are drawer cleats B' on which the bottom
board of a drawer B may slide. The front wall B2 of the drawer is provided with
a shoulder 133 having semi-circular or other recesses to receive the ends or
journals C of ink rollers C. In this instance also the front wail B is provided
with an integral drawer puli B', the front wall being made of a single casting which
projects to the rear in the form of a bracket as at B, through which screws or bolts
are passed into the bottom of the drawer to secure the front wall in position.
The rear wall is made like the front wall with the exception that the drawer
pull 1 is omitted from the casting.
By the construction thus far described, the space between the end walls and the
base is utilized not only in the form of a box, but also with a drawer specially
adapted for the reception and retention of the ink rollers by supporting them solely
by their journals, so that the body of the roll is not injured and all the rolls within
the drawer can be kept free from dust and cleanly.
Upon the base A of the machine, and, by means of knife-edge projections A, is
mounted a treadle D, provided with a laterally projecting lug-embracing pocket D'
on each side, so that, by means of a connecting-rod D2 and crank-arm D³, the main
shaft D'of the press may be rotated. This shaft is mounted in bearings D³ arranged
on the top of the base and at each side thereof and carries a pinion D which meshes
with the master gear D7 of the press. A crank-shaft D is mounted in a frame E
which is connected to the base of the machine by bolts E. The master gear Di is
keyed to the crank-shaft.
A crank rod F is mounted on a pin F projecting from the outer surface of the
master gear D and serves, by a pivotal connection at with the roller frame G,
to oscillate the said frame on its pivotal bearing Gin the frame E.
The rear cross-bars G² of the roller-frame have formed thereon, or attached
thereto, branches G arranged substantially at a right angle to each other and
connected by a vertically and laterally curved slotted bridge (, the slot (³ of
which is designed to operate a pawl-carrying bracket II by means of a pin H
thereon which projects into the said slot.
An ink-disc supporting-bracket I is bolted to the top of the bed I of the press

page_text: and substantially at the centre transversely of the platen. The bracket I is of such
a shape as to bring the surface of the die J in line with the roll-track E2 of the
frame E. The spindle of the disc passes through bearings H, II³ formed in the
pawl-bracket and in bearings I, 13 of the disc-supporting-bracket I.
A chase latch K is pivotted at K' at the top of the bed I and is projected
beyond its pivot and connected with a coil-spring K² which is attached to a lug K**
extending from the ink disc bracket, so that by the said spring the latch is held in
a position to retain the chase against the platen and under so as to permit of raising
the latch for the removal of the chase.
The upper end of the pawl bracket is bifurcated to form two arms Hand H³, the
latter extending beyond the former, so as to form an obstruction against which a
stop on the double pawl L may abut.
These projections L are on the tooth portion of the pawl, of which there are
two, and between the two there projects a reversing arm L which is, during a
movement of the ink disc J operated by a lug J projecting from the lower surface
of the disc (see Figure 10) so as to throw one of the teeth 3 of the pawl out of
operation and to bring the opposite tooth 13 into operation with a series of lugs J³
(see Figure 2) formed on the under surface of the disc and constituting, what may
be termed, the rack-teeth of the disc as they alone operate in connection with the
pawl proper.
The bridge G on the roller frame is curved vertically for the purpose of main-
taining the pin on the pawl carrying bracket and its anti-friction roller 11*,
when employed constantly, within the slot (and the lateral curvature of the
bridge and of the slot is for the purpose of oscillating the pawl bracket H, in order
that the bolt may travel over the rack lugs in one direction and be brought
against one of the said lugs, when travelling in the opposite direction, so as to give
motion to the ink dise to secure a proper distribution of the ink upon the ink-rollers
as they travel over the same (see Figures 10 and 12). When, during the return
stroke of the bracket H, in which is carried over one or more of the rack lugs J³,
the arm L reaches the lug J, then the said arm serves to swing the pawl L on its
pivot L so as to turn the tooth, which, during the preceding platen stroke of the
bracket, moves the disc away from, so as to pass over the adjacent rack lug J³ and
to bring the opposite tooth L³ towards the disc and in line with its adjacent rack
lug so that the said opposite tooth becomes for a time the platen tooth of the
pawl, whereby the disc is rotated in the opposite direction. There being but one
reversing lug it is obvious that the dise will be reversed at the end of each
substantially complete rotation.
An ink fountain M is mounted on a riser M' and secured by a bolt M² to an
arm M³ which terminates in clamps M, M, adapted to embrace the bracket I
above its bearing 12 and to be removably secured to the said bracket by means of a
bolt M passing through both of the clamps which are extended beyond the bolt
and adapted to abut against each other as at M.
The object of the riser M is to elevate the ink fountain and its delivery roll
above and out of contact with the base of the ink disc, in order that the ink shall
be conveyed directly from the fountain to the ink roll of the press instead of to the
ink dise.
The fountain roll M is provided with a rigidly mounted ratchet-wheel M³ and
on the shaft M of the roll there is loosely mounted a pawl-lever M enrrying a
pawl MR.
A connecting-rod MB extends from the free end of the pawl-lever M
to a lug extending from the roll frame G, at such a distance from its pivot, as to
give the desired thres of the commecting-rod and the bolt-lever. The connecting
rol is slotted as at M to give a period of rest between the movements of the pawl-
lever.
The ink fauntain M embodies novel features of construction.
a roll cover M, made as a part of and projecting from one
brackets M, and an opposite roll bearing bracket M
perforated as at M, for the reception of thumb-screws M
It has a cover M
of the roll hearing
These brackets are
which are seated in

page_text: lugs M, formed at opposite sides of the fountain, so that two of the said thumb-
screws serve to bind the parts together to permit of their separation for cleaning
and to regulate the quantity of ink delivered by the roll M. The bracket M has
projecting therefrom and eated therein rigidly a pivotal rod M, which passes
through the upper ends of standards M3 projecting upwardly from the fountain bed.
It will be seen that the single pivot rod M serves to connect the cover M",
the roll cover M and the two roll supporting brackets M pivotally with the
fountain body, as the said rod passes through lugs M formed on the cover M,
which lugs are arranged inside of the standards M, while the brackets M
and Mare arranged outside of the said standards. In Figure 3 the parts are
shewn as opened away from each other; now by drawing the bracket Ms away
from the standards M3 the said parts may be entirely separated from each other
for cleaning purposes. The roll M* fits ink-tight within the brackets and beneath
its cover and against the outlet of the fountain body so that when the parts
are closed the quantity of ink delivered by the roll may be regulated by means
of the screws M.
Referring now to Figure 1, N represents a connecting rod connected operatively
with the connecting shaft D by a divided box N'; it extends and is pivotally
connected at () to rock arms O (shewn in dotted lines) pivotted in the frame at (
The means for pivotally connecting the rod N to the rock arms O' may be readily
extended from one to the other of the rock-arms O, or the said arms may be con-
structed with an integral cross-bar similar to the cross-bar G of the roll frame.
Links O serve to connect the rock-anns with the oscillatory platen support P
by being pivotted in ears P' cast or otherwise formed at its lower extremity.
The platen support is a strong, heavy, substantially U-shaped casting having a
strengthening cross-bar P extending from one arm of the U to the other and
having strengthening webs P³ under each arm around the curves of the U (as
clearly shewn in Figure 4). The support has a pivot bearing 1" and the head of
the support is provided with strengthening ribs and with perforations P® in
which are seated the platen adjusting bolts which have a set nut P
The platen proper Q is cast with the usual strengthening ribs Q¹and with
pivot lugs Q for the support and operation of the gripper shaft R' to which are
secured grippers R and a gripper cam R2 extending beyond its pivot as at R³ for
the connection of a gripper spring R the other end of which is secured to any
suitable fixed part. Thumb-screws R Figure 11, project through collars R of
the gripper fingers and into a slot R7 in the gripper shaft formed for longitudinal
adjustment of the grippers upon the shaft. The platen is also provided with an
apertured lug Q through which a thumb-screw Q passes and is threaded in a
nut arranged above two longitudinal slotted platen gauges Q each of which is
provided at its upper end and on its lower surface and within its extreme edge
with a curved depending lug Q against which the lower edge of the paper rests
when arranged on the gauge (see Figures 4 and 44). The gauges may be adjusted
by turning either the head of the thumb-screw or the nut Q and by sliding the
gauges along on the bolts to determine the distance of their projection upwardly
on the platen and also by swinging the gauges on the bolt to determine the
distance which they shall be from each other. In this adjustment the curvature
of the curved lug Qis advantageous in giving a uniformly smooth surface for
supporting the shaft in all positions of adjustment of the gauges.
The throw-off mechanism involves the following constructions. The platen
proper is connected with the platen support solely by springs S which are at one
end secured to the support by bolt- S' entering apertures Pin the support the
opposite end of each spring is secured to the platen by bolts Sentering
apertures S formed in the platen. Ordinary platen eclamps are provided.
At one end of the platen and entering its edge there is seated a pivot T for a
throw-o lever T. At its free end this lever is provided with a lug T adapted to
engage with a slight projection T formed on the edge of the platen and serving to

page_text: removably connect the free end of the lever against accidental displacement and
yet permit of its quick and ready detachment. Between the free end and the
pivot of the lever T there projects inwardly between the platen and platen support
a rod T upon which a link T is mounted for reciprocation. At its opposite end
it is perforated at a right angle to the bearing for the rod T for the reception of a 5
rod U projecting from the cam frame U of the throw-off mechanism. This cam
frame is pivotted to the under surface of the platen as at U' and is provided with
recesses U having their sides bevelled inwardly from the lower to the upper
surface of the frame for the reception of similar bevolled wedges V. These
wedges are bevelled lengthwise and have enlarged heads V₁ which, when the platen 1
is in position to take an impression from type on the bed, rest upon the bolts P'
of the platen support. The inner surface V' of each wedge is plain and takes
bearing on the trued faces of lugs Q (see Figure 4) formed at the intersection of
two of the strengthening ribs Q₁ of the platen.
By this construction it will be observed that as the platen is in position to take 1
an impression when the free end of the lever T is connected therewith it can be
quickly thrown off, as it is approaching the bed, by simply grasping the handle of
the free end of the lever and quickly drawing it towards the operator, the direction
of the movement of the platen assisting the operation. As the lever is drawn
towards the operator the cam frame is rotated on its pivot thereby withdrawing the 2
thicker ends of the wedges from between the platen and the bolte in its support.
During this movement of the cam frame, the link T travels towards the lever on
the rod T by reason of the curved path of the pin or rod U' on the cam frame
about the pivot U from its end towards the frame U, until it reaches a point
opposite the pivot of the frame when it travels away from the said frame on the 2
pin U
"
In Figure 7 a portion of the frame U and its pin U¹ and the lever and a portion
of the platen are shewn in the relative positions which they occupy when the
platen is "on." By this construction of throw-off mechanism there is but one
part to be seized by the operator and the platen is practically locked beneath 3
when "
"off."
on or
Of course it is understood that the springs S permit of the
change of relative positions and at the same time maintain at parallelism which
would not be secured by the mere pivotal connection and yet have such connection,
constructed to maintain parallelism between the platen and bed when the platen is
on such parallelism will be immaterial when the platen is "off." Any ordinary
pivotal connection of the platen and support can, if desired, be substituted for the
spring connection herein disclosed so that the novel features of my throw-off
mechanism are not limited in this particular.
"
The operation of the parts which give motion to the platen and its support is as
follows: The crank shaft D is rotated by the master gear D' which is keyed
thereto and the said shaft gives oscillation to the rock arms thus giving
oscillation of the platen support by means of the intermediate links O'. When
the platen is parallel with the bed, the parts approach a straight line extending
from the centre of the pivot O' to about the point Figure 1, whereby rebounding
of the platen is prevented and a smooth reversal of the direction in its travel, that 4
is, away from the bed, is secured.
Casting the lugs L' on the teeth L of the double pawl L renders the adjust-
ment of the pawl to co-operate with the frame H and the rack lugs a simple
matter in that after being cast, and while assembling the parts, the lugs L' simply
require, by grinding, a reduction to such a length as to permit of a swinging
movement of the bolt on its pivot sufficient only to allow the tooth of the pawl to
drop behind the rack lug and at the same time to limit the said movement so that
the extreme end of the said tooth shall not come into contact with the disc between
the lug. The arm L' also serves as a weight or counterbalance to maintain the
idle tooth of the double pawl away from the disc until the said arm reaches the
reversing lug J'.

page_text: The ink fountain supporting arm is slotted as at M³ to permit of such an adjust-
ment as will cause the inking roll M of the fountain to project more or less over
the ink disc.
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. A drawer for ink rollers having the opposite walls thereof provided with an
ink roller journal receiving depressions anil with lugs for the connection of the
wall of the drawer with its bottom, sub-tantially as specifiel.
2. A wall for an ink roller drawer having ink roller journal receptacles and
having integral lugs for connecting the wall to the adjacent part of the drawer, the
whole being formed as a single casting, substantially as specified.
3. In a press of the class described, an oscillating platen support, a rock arm
connected by a link to the same, a crank shaft, connected to the rock arm and
gearing connecting the treadle with the crank shaft, substantially as specified.
4. In a press of the class described, a substantially U-shaped platen support
adapted to be extended beyond its point of suspension and connected by links
pivoted to the arms of the support and two rock arms, in combination with a crank
shaft pivotally connected with the rock arms, the latter being pivotted at a point
between the point of suspension of the platten support whereby the operative
parts approach a straight line when the platen is in a vertical position, sub-
stantially as specified.
5. In a press of the class described a pivotted support extended beyond its pivot,
rock arms pivotted at a point below the pivot of the support, links connecting the
free ends of the rock arms with the support, a crank shaft and a connecting rod
extending from the same to the rock arms and connected therewith at a point
between their free ends and their pivots, substantially as specified.
6. The combination with an ink disc and ink disc supporting bracket of a
printing press, of a pawl-carrying bracket mounted for pivotal movement and
provided with an arm extending beyond its pivot and of a slotted cam arranged
upon the ink roller frame to engage a pin on the pawl-carrying bracket and means
for oscillating the said frame, substantially as specified.
7. The combination with an ink dise having a series of rack lugs and a pawl
reversing lug, of a double toothed pawl having an arm arranged in the path of the
reversing lug of the disc, substantially as specified.
8. An ink disc provided with a pawl-reversing lug, substantially as specified.
9. A double toothed ink disc operating pawl having an arm projecting midway
between the teeth of the said pawl and having its outer end at substantially right
angles to its body portion, substantially as specified.
10. The combination with the roller frame of a printing press, and with a cam
thereof, of an oscillating pawl-carrying bracket, a double pawl arranged therein
and provided with a reversing arm and an ink disc provided with rack lugs and a
reversing lug, substantially as specified.
11. In a printing press, an ink fountain, the cover, roller-support and roller-
cover of which are removably connected by a single pivotal rod, substantially as
specified.
12. In a printing press, an ink fountain having its cover, the cover for its roller
and the brackets for supporting the said roller and the body of the fountain
connected by a single rod, substantially as specified.
13. In a printing press, an ink fountain having one of the journals of its rollers
removably mounted in a roll-supporting bracket, the latter being retained in
operative position by the ink supply adjusting serew, substantially as specified.
14. In a printing press an ink fountain having the roller supports and roller
cover thereof secured in operative position by the ink supply adjusting screw,
thereof, substantially as specified.

page_text: 15. In a printing press an ink fountain having a roll cover and roll-supporting
bracket formed in a single casting, substantially as specified.
16. In a printing press an ink fountain having a roll supporting bracket pivotally
connected to the fountain and one longitudinally adjustable and secured in
operative position by the ink supply adjusting screw, substantially as specified.
17. In a printing press an ink fountain body provided with standards apertured
for the reception of a rod and having its cover pivotted to the said rod, substantially
as specified.
18. In a printing press an ink fountain body having standards apertured for the
reception of a rod, and roller supporting brackets mounted on the said rod one
rigidly and the other removably, substantially as specified.
19. In a printing press a roll cover adapted on its under surface to fit the
periphery of the roll and terminating at one side in a bracket provided with a roll
bearing which bracket is fitted to the end of the roller provided with an aperture
for an adjusting screw and with a bearing for its pivotal connection with a fountain
body, substantially as specified.
20. The combination with an ink disc supporting bracket, of an ink fountain
supporting arm terminating in clamps which are adapted to embrace the said
bracket, substantially as specified.
21. The combination of a pawl-carrying bracket having a projecting arm, as at
Hand a double toothed pawl the teeth of which swing in a common plane with
the said arm, as specified.
22. The combination with the platen and its support, of yielding means arranged
between and substantially parallel with the platen and supports and connected at its
ends thereto, substantially as specified.
23. The combination with a platen and its support, of a removable series of
wedges interposed upon curved lines between the platen and support, and means
for changing the positions of the wedges, substantially as specified.
24. The combination with a platen and its support, of an interposed pivot frame
carrying wedges having enlarged heads, substantially as specified.
25. The combination with a platen and its support, of springs connecting the one
with the other, and of an interposed series of wedges bevelled lengthwise and
having enlarged heads designed to rest upon the bolts of the platen supports, and
means for operating the same, substantially as specified.
26. The combination with a platen and its support, of an interposed frame
carrying wedges, and connections for the frame and lever pivotted to the under
surface of the platen, substantially as specified.
27. The combination with a platen and its support, the latter provided with
adjusting bolts and the former with bearing surfaces substantially opposite the said
bolts, of a frame carrying wedges and adapted to move the same between the said
bolts and surfaces, substantially as specified.
28. The combination with a platen and its support, the latter having adjusting
bolts and the former having bearing surfaces, of a pivotted frame carrying curved
wedges, substantially as specified.
29. The combination with a platen and its support, of an interposed wedge-
carrying frame, a rod projecting over the said frame, a lever having a rod projecting
at a right angle from the first-mentioned rod and a link connecting and adapted to
slide on the rods, substantially as specified.
30. As a means for operating a throw-off mechanism of a press, a lever having
a rod, a partially rotating device for moving the platen to and fro, a rod extending
from the said device and a link connecting the same with the rod of the lever, sub-
stantially as specified.
31. The combination with a platen and its support, of a frame having recesses
with inclined walls and with bevelled wedges adapted to fit the said recesses, sub-
stantially as specified.
32. In combination with the platen of a press, a lever pivotted to the platen,

page_text: throw-off mechanism, the parts thereof with the exception of the said lever being
arranged in the rear of the pivot of the lever with relation to the direction of
movement of the platen towards the bed, and connecting devices arranged between
the throw-off mechanism and the lever, whereby a single movement of the free end
of the lever in a direction opposite to the movement of the platen serves to throw
off the same, substantially as specified.
33. The combination with the platen of a printing press, of a bearing such as V
for the platen having a flat surface for holding the strain of the impression and an
inclined portion for throwing off the impression, substantially as specified.
34. The improved printing press herein before described and illustrated in the
accompanying drawings.
Dated the 94th day of June 1891
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant.