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Патент USA US2403760

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July 9, 1946.
w. sEYBoLD
TWIN CRANK BED MOTION
Filed Jan. » 151,-> 1944
@i
ì
' ‘ 2,403,760.
Patented July 9, 1946
2,403,760
rrederi'ckwßeyboia, Westfield, N. J., assignor to
AmericanlType Founders, Inc., Elizabeth, N. J ¿,
a corporation ofNew J ersey`r ' f
Application January 31, 1944, SerialfÑO. 520,559
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_
(ol. 174-127 )
9 Claims.
, _Qther ,objectsV or features of v'novelty -_willïbe y
This invention relates toA bed motions-and, more
particularly to such motions which are especially
` ' apparent _from @the Afollowing specification rwhen
adapted. for `application tothel‘ßciprocating beds 'y ' “ read in `connection with' the acc,omparnling,tirent--
ing in which oneembodiment of the inventionv is
ofbed
The and
_general
cylinderprinting»
lobject _of> thepresses.n
invention is,` to
e » ,pro
,
illustrated by wayvofexample.
videpan improved 'bed motionffor printing presses '
»
.
Y..~ . -
.
kIn the drawing,
or the like,„in which' the ,impression cylinder ro
Figure 1_'is a diagrammatic View in side 4eleva
tates> at a constantflinear velocity, and in which " tion lof a bedand cylinder press embodying the
a novel transmission is employed to oscillate theY
principles ofthe invention;
Y
. ~ , Y,
.Figure `2 is a graph comprising the displace
bed vbetweenftwo extreme positions, so that dur
ment curve in which displacement of the bed is
ing a large portion of its stroke in one direction,
plotted against the crank angle of th'ezinterme
when the bedgis in vprint-ing contact .with ?the
cylinder,I the bed moves at a uniform linear ve
diate crank; and
Y
, ,
locity’exactly equal to that of lth‘e cylinder. These
Figure 3 is a tabulation of the relative propor
movements are Yelïected by means of _aminimum
tions of the dimensions and, distances,y shown in
number of parts, allof which are simple machine
elements readilyY manufactured without special
Figure 1, in order to attain the displacement curvev
y of Figure 2.
„tools or the use of special processes, the entire
_In the diagrammatic view constituting Figure
action of all parts being continuous Without peri
Y l of the drawing there is illustrated a bed and
odic engagement and disengagement withV each 20 cylinder press, the rotating impression cylinder
being indicated >at yHl andthe reciprocating bed
_ other.
In its preferred embodiment, the invention conf
templates .th'e provision of a4 main bed driving
lever pivotally connected with the bed at its up
per end- and adapted to extend therefrom in ay
generally downward direction.
The lever has a
atï-Hï. Asuitable bearing surface I2 is provided
along Vwhich the bed is adapted to move, carrying
the printing form I3Y into and out of contact
25 with thepaper on lthe impression cylinder lil.
combined~ pivotal andtranslatory movement. in
a plane generally'parallel with the directionY of
movement' of the bed. The -particular movement
of the lever to yield the desired bed velocity curve 30
is effected by the use of two cranks, th’ese cranks
being -disposedpreferably Yupon yone sideof the
lever and having theiraxessubstantially perpen
dicular to the plane of swinging movement of the
lever. The two „cranks are out of phase withr
each other as well as having dilïerentY throws and
Suitable antifriction elements for facilitating the
movement of the bed are indicated at I4. During
vpart of its travel, the form may be brought into
contact with conventional inking mechanism of
which thevtwo form rollers l5v are representative.
The impression> cylinderv Hl is driven vfrom the
mainpower means of the press through suitable
gearing `which ralso maybe conventional and
which it is unnecessaryto show in the present
disclosure.
`
Y
,
'
~
' A driveV gear I6 suitably connected with the
power means soas to be driven with uniform mo
The crank pins of the cranks are connected re
tion 'and in synchronism with theY impression cyl
spectively with an intermediatepoint on the lever , inder is rotatably mounted at the lowerrportion
and the lower end thereof byv means of links 40 of the press frame. The gear I6 meshes with an
which extend in, generally horizontal directions.
idler l1, which is preferably of the same diameter
l To attain the velocity curve shown in Figure 2
as the driven gear I8, which provides one of the
of the drawing, for example, in which the period
cranks for moving the bed l l. A smaller vgear I9
of uniform bed movement extends from approxi
is also driven by the idler l1 but this gear is only
mately 40° to approximately 120° ofthe cycle of 45 one-third the size of the gears I'l and I8. The y
movement, the crank f. which is connected with
gears I8 and I9 are driven in the same direction
the lower end ofy the lever vis, driven three times
of rotation, shown in the illustratedexample as
angularvelocities.
n
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,
as fast as th'e crank connected to the intermediate
point and is initially set 217° `inadvance of the
intermediate crank,„the intermediate crank at
that ,initial point of the bed movement being
horizontal andvextending toward the lever.,V Both
cranks are rotated Yin the same direction, and
theratio _ofthe length 0f theintermediate crank
tov that of the end crank'is 1 to .1056. Also, in
order 'to lprovide the particularv bed velocitycurve
shown in Figure 2, the other dimensions >and dis
tances involved in the `novel bed motion should
be in the proportions indicated in the table com-‘
Pr/iSîngFigure B_¿Ofthe drawing.:
‘
.
,
,
being clockwise.
A lever 20 has its upper end pivotally connected
50 to an ear or lug 2| secured to thel reciprocating
bedzll, >the pivot point >being designated C, and
being for convenience of illustration> situated on
the level of the bearing surface I 2. A link 24 piv
otally connects an intermediate point B of the le
ver "20 with a point A of the crank gear I8. An
other link 25y connects-the lowermostpoint E of
theV lever 20 Witha point'G on' the smaller crank
gear i9. The Vcenter -of the larger crankl gear i8
is indicated at O and the center of the smaller>
gear. vIllas designated F; and .thusvthe driving
2,403,760
4
3
cylinder during the return stroke of the bed is
crank for the intermediate portion of the lever 20
is of the length O-A and the crank length for
provided, and it is understoodthat, all other nec
The centers O and F are in vertical alignment
essary or convenient parts usually associated with
presses of this character may be employed, al
and a line connecting these centers intersects the
Ythough only that much of the press as is necessary
the lower end'of the lever is F-G.
.
,
'
surface I2 (which, in this case, is the path of the \' ~ ' for a disclosure of .the present invention is shown
j in theV drawing.
It is understood that terms of orientation used
in the specification and claims, such as “above,”
“below,”v “horizontaL” etc. are used in an exem
plary sense only, and if the plane of movement of
the bed is changed from the horizontal, the terms
describing the positions or movements- of the
pivot point C) at the point H.
In Figure 1 of the drawing, all of the parts are
shown in their initial positions-with the bed at
its extreme left hand point. Under these condi
tions, the crank O-A is horizontal and extending
to the left of the center of thecrank gear I8, and
this horizontal position will be taken as the zero
position in diagramming the movementl of the
bed. The initial position of the crank F--G is one
which is displaced 37° below the horizontal in a
clockwise direction, in other words, 217° in ad
vance of the crank O-A.
»
l
other parts must be altered accordingly to pre
serve the relative positions and relationships of
the various parts, within the principles- of the'in
vention.
’
Various changes and modiñcations may be
»
made in the embodiment illustrated and described
It has been found that in order to give unifor
motion of the bed for a substantial portion of the 20 herein without departing from the scope of the
invention as defined by the following claims.
stroke in one direction (a little more than 80° in
Having thus described the invention, what is
this case) the various cranks, linkages, lever por
claimed as new and desired to be secured by
tions, and distances should` have the relative
Letters Patent is:
v.
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Y »
‘
lengths set forth in the following table:
425
Unit length
Distance
1. A bed motion of the class described com
prising, in combination, a reciprocating bed,
means for driving the bed comprising a lever
having one end pivotally connected with the bed
and extending at an angle tothe direction of
30 movement of the bed, a power driven'lcrank op
eratively connected with an intermediate'portion
of said lever, another power driven crank opera
tively connected'with the end of said lever remote
from said bed, and power means'unconnected
35 with said lever or bed except through said cranks
With these dimensions, and the initial positions
of the points A and G as indicated, the displace
for driving said cranks at diiferent angular've-~
locities.
ment diagram of the bed will be as shown in Fig
ure 2 of the drawing. In this graph, the bed dis
placement is plotted against the crank angle of
the crank O-A. It will be Seen that the curve
is practically a straight line beginning a little
below the 40° point and extending slightly beyond
the
120°
point.
v
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,
l,
.
y
2. A bed motion of the vclass vdescribed com
prising, in combination, a reciprocating bed,
means for driving the bed comprising a lever hav
ing one end pivotally connected with the bed
and extending at an angle tothe Vdirection of
movement of the bed, and adapted to'swing about
its pivotal connection with the bed during opera
tive movement, and a power drive crank the axis
of rotation of which is substantially rperpendicu
lar to the plane of swingingmovementof the
_
The positions of the principal points, of the
bed drive, at the start ofl the uniform motion pe
riod are indicated by the same letters but with
the subscript “1.” For example, the pivotal con
lever, means operatively connectingsaid crank
nection between the lever 20 and the bed will be
Vto said lever at an intermediate point, another
at the point Ci and the lever will be deñned by 50 power driven crankthe axis of which isV also sub
the points C1, B1, and E1. At this time, the piv
otal connection of the link 24 with the crank gear
I8 will have moved to lthe point A1, displaced by
40°'fr0m the zer-o point A. Since the initial posi
tion of the point G was at 217°, and since the gear
I9 rotates three times as fast as the gear I8, the
point of pivotal connection with the link 25 and
the gear I 9 at the beginning of the period of uni
form motion, will be at G1 spaced 337°.from the
stantially perpendicular toY said plane,V means
operatively connecting said second crank with
55
the end of said lever remotefrom, said bed, and
power means unconnected with said lever or bed
except through said cranks for‘driving said cranks
at different uniform angular velocities, the veloc
ity of one of said cranks being an even multiple
of that of the other.I
f
3. A bed-motion of the class'described com
zero point.
prising, in combination,V aKV reciprocating bed,
means> for driving the bed comprising `a lever hav
ing one end pivotally connected .with the bed
and extending ina generally perpendicular Adi
rection therefrom, and ¿adapted to swing about
the main crank will have moved through 120°, Ithe 65 its pivotal connectionwith the bed during opera
pivot point being at Az; and the point G will have
tive movement, and-a crank the axis-of rotation
made a complete revolution around the center F,
of which is substantially perpendicular to the
whereby the positions G and'G2 are identical. ’
plane of swinging movement of theflever, a link
At the end of the period of uniform motion the
bed connected lever 20 will be in position
operatively 'connecting said crankto saidV lever
After the period of uniform motion is concluded
the bed moves on to the end of its printing stroke 70 at an >intermediate point, another „crankthe axis
of which is also substantially perpendicular to
and then through its return stroke, which does
not necessarily have any uniform velocity portion,
back to the zero point at the left hand end of'its
travel.
Y,
.
.
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>
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l'
'
.
Suitablelmechanism for lifting'the impression
said plane,'anothe`r Vlink operatively connecting
said second crankvwith the end of -said lever‘re
mote from said bed, and means forfdi‘iving said
cranks at differentunifonn'angular lvelocities,
2,403,760
the velocity of the end crank being an even
multiple of that of the intermediate crank.
4. A bed motion or” the class described com- '
prising, in combination, a reciprocating bed,
means for driving the bed comprising a lever
having one end pivotally connected with the bed
and extending at an angle to the direction oi
movement of the bed, and adapted to swing about
its pivotal connection with the bed during opera
tive movement, and a crank the axis of rotation
of which is substantially perpendicular to the
plane ‘of swinging movement of the lever, means
operatively connecting said crank to said lever at
an intermediate point, another crank the axis
of which is also substantially perpendicular to
6
angular velocity of the first >named crank, the
relative dimensions of the parts being as fol- »
lows:
Units
Length of lever ________________________ __
51/3
Length of first named crank ____ __ ______ __
1
_Length of ñrst named link _____ __ ____ _-___
45/9
Length of second named crank _________ __ .1056A
Length of second named link ________ ___-'4%
Distance of axes of first named crank from
locus of lever and bed pivot __________ __
2%
Distance of axes of second named crank
from locus of lever and bed pivot ______ __
51/3
8.1m a bed motion of the vclass described, in
combination, a supporting frame, a horizontally
said plane, means operatively _connecting said
reciprocating bed, a lever pivotally connected at
second crank with theend of said lever remote
from said bed, and means for driving said cranks
at different uniform angular velocities,` the veloc
ity of one of said cranks being an even multiple
of that of the other, both of said cranks being
spaced from said lever- in the direction of longi
tudinal movement of said bed and positioned so
its upper end with said bed andadapted to swing
that the projection of a line joining the axes or
second crank mounted for rotation on said frame
about its pivotal point in the general direction of
movement of said bed, a crank rotatably mounted
upon said frame at one side of said lever and
having its axes perpendicular to ^ the plane of
swingv of said lever,A a link operatively connecting
said crank with the midpoint of said lever, av
said cranks intersects the plane of movement oi 25 with its axes directly below that of said ñrst
the bed substantially at right angles.
named crank, the projection of a line joining said
5. A bed motion oi the class described com
axes being perpendicular to and intersecting the
prising, in combination, a reciprocating bed,
extension of the locus of the point of pivotal
means for driving the bed comprising a lever hav
connection between the bed and the lever, means
ing one end pivotally connected with the bed .
for driving said ñrst named crank, means for
and extending in a generally perpendicular di
driving said second named crank at three times
rection therefrom, and adapted to swing about
the angular velocity of the ñrst named crank, the
its pivotal connection with the bed during opera
relative dimensions of the parts being as follows:
tive movement, and a crank the axis or rotation
~
of which is substantially perpendicular to the
,
Units
plane of swinging movement of the lever, a link
operatively connecting said crank to said lever
at an intermediate point, another crank the axis
Lengthof lever ________________ __' ______ __
51A;
Length of iirst named crank ____________ __
1
said second crank with the end of said lever re
mote from said bed, and means for driving said
Distance of axes of ñrst named crank from
Length of ñrst named link _____________ __
4%
Length of second named crank _________ __ .1056
, of which is also substantially perpendicular to
said plane, another link operatively connecting 40 Length of second named link ___________ __ 4%
locus of lever and bed pivot __________ __
2%
DistanceV of axes of second named crank
cranks at diiîerent uniform angular velocities,
the velocity of the end crank being three times
that of the intermediate crank, both of said
from locus of lever and bed pivot_ _____ __
51/3
the position of said first named crank being hori
cranks being spaced from said lever in the direc
zontal and extending toward said lever when the
tion of longitudinal movement> or said bedand
bed is in its remote position from said crank, and
positioned so that the projection of a line joining
the position of said second named crank at that
the axes of said cranks intersects the plane of
time being 217° in advance of said first named
movement of the bed substantially at right angles. 50 crank, both cranks rotating in the same direction.
6. The bed motion set forth in claim 5, in which
9. A bed motion of the class described compris
both cranks rotate in the same direction and
ing, in combination, a reciprocating bed, means
when the bed is in one of its extreme positions,
for driving the bed comprising a leverhaving one
the intermediate crank is parallel with the direc
end pivotally connected with the bed and extend
tion of movement of said bed and the end crank
ing in a generally perpendicular direction there
is 217° in advance of the position of said inter
from, and adapted to swing about its pivotal con
mediate crank.
7. In a bed motion of the class described, in
combination, a supporting frame, a horizontally
reciprocating bed, a lever pivotally connected at
nection with the bed during operative movement,
and a crank the axis of rotation of which is sub
eo
its upper end with said bed and adapted to swing
about its pivotal point in the general direction of
stantially perpendicular to the plane of swinging
movement of the lever, means operatively con
necting said crank to said lever at an intermediate
point, another crank the axis of which is also
movement of said bed, a crank rotatably mounted
substantially perpendicular to said plane, means
upon said frame at one side of said lever and
operatively connecting said second crank with the
65
having its axes perpendicular to the plane of
‘end of said lever remote from said bed, and means
swing of said lever, a link operativelyconnecting
for driving said cranks at different uniform
said crank with the midpoint of said lever, a
angular velocities, the velocity of one of said
second crank mounted for rotation on said frame
cranks being an even multiple of that of the other,
with its Vaxes directly below that of said -ñrst
both of said cranks being spaced from said lever
named crank, the `projection of a line joining said 70 in the direction of longitudinal movement of said
axes being perpendicular to and intersecting the
bed and positioned so that the line joining the
extension of the locus of the point of pivotal con
axes of said cranks is generally parallel with said
nection between the bed and the lever, means for
lever.
driving said ñrst named crank, means for driv
FREDERICK W. SEYBOLD.
_ing said second named crank at three times the 75
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