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Патент USA US2112215

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March 22, 1938.
J. R. WOOD
A2,1125215
BED MOTION
original Filed Nov. 26', 1954
Aw.-/1,I
4 Sheets-Sheet l
' March 22, 1938.
J. R. woon l l
2,112,215
BED MOTION
original Filed N<>v._ 26, 1934
4 Sheets-Sheet 2
March 22, 193s.
J. R. woon
.2,112,215
BEÓ MOTION
‘ Original Filed Nov. 26, 1934
F/ß, 4
4 Sheets-Sheet 3
-
March 22, 1938.
J. R'WOQD '
2,112,215
BED MOTION
original Filed Nov. 2e, 1934
4 shee1s~sheet 4
VPatented Mar. 22, 1938
2,112,2ii
UNITED ' STATES
PATENT OFFiCE
2,112,215
BED MOTION
James It. Wood, Shelton, Conn., assignor to Har
ris-Seybold-Potter Company, Cleveland, Ohio,
a corporation of Delaware
Application November 26, 1934, Serial No. 754,837
Renewed May 14, 1937
12 Claims.
This invention relates to improvements in bed
motions, that is to say mechanism for reciprocat
ing the bed of a printing press or other machine
at a constant speed during the intermediate por
5 tion of its travel, and for producing a gradual
slowing down and stopping and a gradual accel
eration in the opposite direction during the end
portions of the bed travel.
plishing the smooth reciprocation of a heavy bed,
so as to make high speeds possible without undue
strain upon the machine or its mounting.
A further object is the provision of driving
1 5 mechanism such that gearing with teeth of fine
pitch is utilized during the intermediate or print
ing travel of the bed, While gearing with teeth of
coarse pitch is utilized for theV end portions,
thereby insuring accuracy for the motion of the
20 >bed during the interval in which the printing is
performed, and providing heavy strong connec
tions during the end motion intervals when ac
curacy is not important.
Other objects andfeatures of novelty will ap
pear as I proceed with the description of that em
bodiment of the invention which, for the purposes
of the present application, I have illustrated in
the accompanying drawings, in which
0 tical section, illustrating an application of the
invention to a printing press.
‘
Fig. 2 is a plan view, partially in horizontal
section on the line 2--2 of Fig. 1, and with a por
tion of the bed broken away to more clearly dis
35 close the driving mechanism.
ness.
The bed, as previously indicated, has two
classes of movement, a movement at constant
speed during the intermediate part of the travel
A-Bl and D--E of Fig. 8, and a harmonic move
ment of deceleration and acceleration at each
end of the travel represented by the semi-circular
lines B-C-D and E-F-A of Fig. 8. Two
thirds of the time of each cycle is occupied in the
movements A--B and D--E, and one-third of the
time is occupied in the two end movements A15
B--C-D and E-F--A, that is to say each com
plete end movement occupies one-half of the
length of time of an intermediate movement.
The distances traveled by the bed during its dif
ferent movements are indicated by the dimension
lines in Fig. 8.
The constant speed movements of the bed are
produced by the use of an inverted rack 2U and
a pinion 2l meshing therewith, each having teeth
of relatively ñne pitch. The rack is secured
to the under surface of the bed by screws 22 or
the like. The pinion 2i is keyed to a shaft 23
and on its forward end outside the frame of the
machine it carries two pinions 24 and 25 which
are likewise provided with teeth of relatively ñne
mesh.
On a shaft 26, which is rotatably mounted in
the forward frame member I0, there is keyed a
Figs. 3 and 4 are transverse vertical sectional
views taken substantially on the lines 3_3 and
rotatable member or wheel 21 of large size, upon
which is mounted near the rim an internal gear
sector 28. An external gear sector 28, offset ax
4-4 of Fig. 1. v
ially from the sector 2B and positioned radially
Figs. 5, 6 and '7 are diagrammatic views illus
4 O trating the positions of the driving mechanism
inward therefrom, is also mounted upon the ro
tatable member. These two sectors are posi
0
40
at different points of the bed travel, and
Fig. 8 is a diagram representing the time inter
vals elapsing during the different portions of the
tioned diametrically opposite each other. Their
teeth are of relatively ñne pitch to mesh with the
teeth of the pinions 24 and 25, and each sector
travel of the bed.
has one tooth more than the number which could
be included within 120° of arc. The sector 28 is 45
,
Similar reference characters refer to like parts
throughout the views.
In the drawings, I have illustrated the frame
of a reciprocating bed printing press as compris
ing side members I!! and cross members or struts
I I, I2 and I3. Supported upon the cross mem
bers I I, I2 and I3 are four longitudinally extend
ing rails I4, i5, i6 and I'I, the upper surfaces of
which constitute ways.
Running upon these
Ways there are a series of rollers i8 which sup
5m
are maintained in position by a frame or cage in
the usual manner, this part of the machine being
omitted from the disclosure for the sake of clear
which has bearing in the side frame members I0,
Fig. 1 is a side elevational View partially in ver
45
(Cl. 74-27)
in both directions, as represented by the lines
One of the objects of the invention is the pro
1 0 vision of relatively simple mechanism for accom
'3
f
port the bed I9 of the machine. The rollers I3
adapted to mesh With the outer side of pinion 2t
for producing rotation of shaft 23 in an anti
clockwise direction, while the sector 29 is adapted
to mesh with the inner side of the pinion 25 for
producing rotation of shaft 23 in a clockwise di
50
rection. The gearing is so designed that the
same number of revolutions of shaft 23 Will be
produced by each of the sectors. Between the
end of one sector and the adjacent end of the
other sector there is an angle of approximately 55
2
2,112,215
60°, during which neither sector is in driving
relation with the shaft 23. During the intervals
corresponding to these 60D angles the reversing
motion of the bed takes place, and at such times
the rack 2E) drives the shaft 2‘3 through pinion
2|, instead of being driven by the pinion.
On the periphery of the rotatable member 2T
there is an external gear 3@ with teeth of relative
ly fine pitch which meshes with a gear 3 la keyed
to the shaft 32.
Fixed on the same hub with gear
3m is a gear Bib which is provided with teeth of
a relatively coarse pitch. The latter gear meshes
With a pinion 33, also having teeth of coarse pitch,
that is keyed to a shaft 34 upon which is mounted
a pulley 35. Power for operating the machine
may be applied to pulley 35 by means of a belt, for
example. Driving force for the shaft 32, upon
which the heavy loads incident to the reversal
of motion of the bed are imposed, is therefore ap
20 plied directly to that shaft through heavy gearing
rather than through the fine gearing used to
drive rack 20.
The gear 3|] on the periphery of the rotatable
member 2l may also mesh directly with gears 3E
25 and 31 mounted upon or associated with impres
sion rolls 38 and 39 respectively, thereby provid
ing a close and accurate connection between the
bed and impression roll movements. That fea
ture of the invention however, together with var
30 ious other features having to do especially with
printing presses, is covered in a separate appli
cation ñled of even date herewith.
35
40
45
50
The mechanism for accomplishing the har
monic reversing movements will now be described.
A pair of reversing racks 40a and 4Gb are at
tached to the under side of the bed i9 just behind
the rack 2|). These racks are mounted in align
ment and their centers are spaced apart a dis
tance somewhat less than the length of rack 20.
Their teeth are of a relatively coarse pitch. A
gear 4 I, mounted upon a short shaft 42 which has
bearing in the rails l5 and I6, is adapted to mesh
with the racks 43a and 4Gb during the end por
tions of the bed travel.
The gear 4| is arranged to be rotated in oppo
site directions alternately by a driving rack 43
which meshes with the under side of the gear
and is attached by means of screws 44 or the like
to a yoke 45 that is slidably mounted upon a guide
bar 46 secured by suitable means to the rail iii
or other fixed portion of the machine. The yoke
45 carries a vertical channel guide 47 in which
runs a roller 48 that is mounted upon a pin car
ried by a crank disc 49 which is keyed to shaft
55 32. The effective crank length is the same as the
pitch radius of gear 3 ia.
The parts 45, 4l, 48 and
49 therefore constitute a scotch yoke mechanism
for producing simple harmonic motion of the
rack 43, which motion is transmitted at the proper
60 times through gear 4! to the reversing racks 40a
and 4Gb. The rack 43 is of course reciprocated
at all times, but it does work only during one-third
of each cycle of the bed, that is during the periods
represented by the lines B-C-D and E-F-A
65 of Fig. 8.
The gears 3m and 3i] have pitch diameters in
the ratio of l to 3. The sectors 28 and 29 each
occupy an angle of 126°. Hence the constant
speed travel of the bed in either direction corre
70 sponds to a complete revolution of the crank pin,
and if the time occupied by a complete revolution
of the crank pin is taken as 1, then the time oc
cupied by a complete reciprocation of the bed is
3. This ratio of 1 to 3 is the preferred ratio, but
-75 other ratios, as 1 to 5 or 1 to '7, may also be €111
ployed. In any event, each end movement of the
bed occupies one-half of a crank revolution, While
the constant speed movement in each direction
may occupy one, two, or more complete revolu
tions of the crank. The constant speed move
ment must occupy one or more complete revolu
tions of the crank, as distinguished from half
revolutions as otherwise the crank movement
would come in the wrong direction at one end
of the travel. Hence the ratio of end motion to 10
constant speed motion must be l to some odd
number greater than 1, which means that the
pitch diameter ratios of gears 3Ia and 30 must
also be 1 to some odd number greater than 1.
The axis of gear 4| is located preferably in the
same vertical plane with the axis of shaft 26, that
is to say half Way between the impression rolls
38 and 39, because that is the desired center line
of travel of the bed. In the case of my construc
tion it is readily possible to utilize this most ad 20
vantageous position on account of the fact that
the shaft 23 is preferably offset from the plane
through the axis of shaft 26.
Operation-In Fig. 1 the bed is shown in its
dead center position at the right hand end of its 25
travel, in other Words in the position represented
by the point C in Fig. 8. At this time the crank
pin roller 48 and the yoke 45 are on left dead cen
ter, and the inertia of the yoke and associated
parts in moving to that position has counteracted
to some extent the inertia of the bed in moving
to the right. As the crank pin roller 48 rotates
clockwise from the position of Fig. 1 to that of
Fig. 5, the yoke 45 and its rack 43 move toward
the right with a regular acceleration, and thereby 35
rotate gear 4| in an anti-clockwise direction with
the same acceleration. The bed then travels to
ward the left with a gradual acceleration until, at
the point illustrated in Fig. 5, it has attained
maximum speed. This corresponds with point D 40
in Fig. 8. During this acceleration of the bed
from zero to maximum speed, the shaft 23 is simi
larly accelerated in an anti-clockwise direction
by its engagement with the bed through the rack
2Q and pinion 2|. When the bed travel reaches 45
its maximum at the point D the rack 40a leaves
the gear 4| and the gear sector 28 engages pinion
24, continuing its rotation in the anti-clockwise
direction. Motion is then transmitted through
the shaft 23 and the pinion 2| in an anti-clock 50
wise direction, to move rack 20 and bed I9 toward
the left at a constant speed. Such constant speed
is maintained until the bed arrives at the position
illustrated in Fig. 6, which corresponds with the
point E in Fig. 8. At this point the gear sector 55
28 leaves pinion 24 and gear 4| begins to mesh
with rack 4Gb. Yoke 45 is now in a maximum
speed position, but as the roller 48 continues from
the position illustrated in Fig. 6 through the next
90° of its rotation, the yoke decelerates while 60
moving toward the right. In so doing the gear
4| is rotated anti-clockwise and the bed I9 is ac
cordingly caused to travel a further short distance
toward the left, that is to the position indicated
by the point F in Fig. 8. At that point the direc
tion of movement of the yoke 45 is reversed and
the bed begins its travel toward the right from
F to A in Fig. 8. During this reversal movement
corresponding to the line E-F-A, the rotation
of shaft 23 is of course decelerated to zero and 70
then accelerated in the opposite or clockwise di
rection to maximum speed, being driven by the
bed in this portion of the cycle. In Fig. '7 the
bed is in a position corresponding with the point
A in Fig. 8, the rack 4Gb is just leaving the gear 75
2,112,215
3
4l, and the íexternal gear segment 29 is just be
a second gear vertically disposed and rotating
ginning to mesh with pinion 24. Rotation is once for each cycle of said bed, a segmental in
thereby imparted to that pinion and to its shaft ternally toothed member and a segmental ex
23, continuing the rotation of the latter in a ternally toothed member each arranged to ro
clockwise direction, producing travel of the bed tate with said second gear and disposed on the
to the right at constant speed, which continues same side of said bed as said second gear, each of
until the bed reaches the position corresponding said segmental members meshing intermittently
to point B in Fig. 8. The reversing mechanism with a corresponding one of said two pinions for
then comes into play, stopping the bed at the driving said bed in alternately opposite directions
point -C and ending the cycle.
throughout the major portion of the stroke 10
While I prefer to employ simple harmonic mo
thereof, mechanism for reversing the direction
tion- for reciprocating the rack 43 in order to of motion of said bed at the ends of its stroke,
impart to the bed at the ends of its travel a
deceleration and an acceleration as smooth and
even as possible, it will be understood that a less
costly mechanism for the reciprocation of the
rack, as for instance a simple crank mechanism,
could be employed without departing from the
spirit of the invention in some of its broader as
20 pects.
Other variations from the described structure
may be employed. Accordingly I desire it to be
understood that the scope of the invention is to
be regarded as defined exclusively by the ap
25 pended claims rather than by the foregoing de
' scription or the accompanying illustrations.
Having thus described my invention, I claim:
1. In mechanism of the class described, a re-V
ciprocating bed, gearing for driving said bed in
~30 alternately opposite directions through the
major portion of the stroke thereof, comprising
a shaft, two pinions mounted on said shaft, a
rotatable element provided with an annular
, toothed portion, a segmental internally toothed
A35 portion and a segmental externally toothed por
tion, each of the said segmental toothed portions
being adapted to mesh at different times with
one of said pinions for actuating said gearing,
mechanism for reversing the direction of motion
40 of said bed at the ends of its stroke, a pinion
meshing with said annular toothed portion of
said rotatable element, and a crank pin carried by
said pinion and operatively connected to said re
versing mechanism for actuating the latter.
2. In a printing press, a reciprocating bed,
gearing for driving said bed in alternately oppo
site directions, including two concentric pinions,
a ñrst gear vertically disposed and adapted to
rotate once for each cycle of said bed, a segmental
internally toothed member and a segmental ex
ternally toothed member, each of said members
being connected with said first gear to rotate
therewith and disposedon the same side of said
bed as said iirst gear, each of said segmental
members meshing intermittently with a corre
sponding one of said two concentric pinions for
driving said bed in alternately opposite direc
tions throughout the major portion of the stroke
thereof, mechanism for reversing the direction of
60 motion of said bed at the ends of the stroke there
of including a pair of racks carried by said bed,
including a pair of racks carried by said bed, a
third gear adapted to mesh with one rack of said
pair at each end of the stroke of said bed, a re
versing rack continuously in mesh with said third
gear, a scotch yoke operatively connected to said
reversing rackV for imparting reciprocating mo
tion to the latter, a crank pin and crankshaft for
reciprocating said scotch yoke, and a fourth gear
meshing with said second gear and carried by said
crankshaft, said fourth gear and second gear
having a ratio of one to three, whereby said
crankshaft and said second gear are maintained
in timed relation to drive said scotch yoke three
times for each cycle of said bed.
4. In mechanism of the class described, a re
ciprocating bed, a b-ed rack mounted thereon, a
pinion meshing with said bed rack, a shaft for
said pinion, means for driving said shaft in op
posite directions comprising a rotating member
having an outer internal gear sector and an in
ner external gear sector, two pinions mounted
on said shaft, each of said last named pinions be
ing adapted to mesh with one of said gear sectors,
a pair of reversing racks mounted on said bed,
a gear adapted to mesh with said last named
racks during the end portions of the travel of
the bed, a driving rack in constant mesh with said
gear, and means for reciprocating said driving
rack during each complete reciprocation of the
15
20
25
30
35
A'1.1.0
bed an odd number of times greater than one.
5. In mechanism of the class described, a re
ciprocating bed, rack and pinion means for pro
ducing intermediate travel of the bed in both
directions, said rack and pinion means compris~
ing relatively fine teeth, means for driving‘said
rack and pinion means for producing reciproca
tion of the bed in opposite directions through the
intermediate portion of its travel, a pair of coarse
v50
toothed reversing racksY mounted on the bed, a
gear wheel element with coarse teeth adapted to
mesh with said reversing racks during the end
portions of the bed travel, a coarse toothed rack
element meshing with said coarse toothed gear
wheel element, and means for reciprocating one
of said elements, whereby the strain of reversing
the direction of bed travel is taken upon coarse
gear teeth and whereby the constant speed travel
of the bed is eñected by relatively iine gear teeth. 60
6. In mechanism of the class described, a re
a second gear adapted to mesh with one rack
` of said pair at each end of the stroke of the bed,
ciprocating bed, a bed rack with fine pitch teeth,
cycle of said bed, and means for driving said re
ciprocating means in timed relation lwith said
first gear.
3. In a printing press, a reciprocating bed,
of coarse pitch, a gear adapted to mesh with said
a pinion meshing with said bed rack, a shaft upon
a rack continuously in mesh with said second »which said pinion is fixed, a pair of spaced re
gear, reciprocating means for imparting to said versing racks mounted in alignment lcngitudinal~ f65
last-mentioned rack three reciprocations for each ly of said bed, said reversing racks having teeth
gearing for driving said bed in alternately op
posite directions including a rack carried by said
bed, a first gear in continuous mesh with `said
rack, a shaft fixed for rotation with said gear,
75
two pinions fixed for rotation with said shaft,
reversing racks during the end portions of the
travel cf the bed, means for turning said gear in
opposite directions with simple harmonic motion, 70
said means comprising a crank shaft, and a train
of gears operatively connecting said crank shaft
with said ñrst named shaft for imparting rotation
to said first named shaft in opposite directions at
spaced intervals, said train of gears having teeth 75
4
2,112,215
of ñne pitch, and means for applying power to
said crank shaft.
'7. In mechanism of the class described, a re
ciprocating bed, a bed rack with teeth of fine
pitch, a pinion meshing with said bed rack, a
shaft upon which said pinion is ñxed, a verti
cal rotating member having an outer internal
sector and an inner external gear sector offset
axially, the teeth of said sectors being of ñne
10 pitch, two pinions mounted upon said shaft,
each pinion being adapted to mesh with one of
said gear sectors, a pair of spaced reversing
racks mounted in alignment longitudinally of
said bed, said reversing racks having teeth of
coarse pitch, a gear adapted to mesh with said
reversing racks during the end portions of the
travel of the bed, a driving rack meshing with
said gear, means for reciprocating said driving
rack comprising a crank shaft, an external gear
20 with iine pitch teeth on said rotating member,
a gear on said crank shaft meshing with said
to rotate once for each cycle of said bed, a seg
mental internally toothed member and a seg
mental externally toothed member, each of said
members being connected with said ñrst gear to
rotate therewith and disposed on the same side
of said bed as said first gear, each of said seg
mental members meshing intermittently with a
corresponding one of said two concentric pinions
for driving said bed in -alternately opposite di
rections throughout the major portion of the
stroke thereof, mechanism for reversing the di
rection of motion of said bed at the ends of the
stroke thereof including a reciprocable rack,
means for reciprocating said rack three times for
each cycle of said bed, means for intermittently 15
placing said rack into operative relation with
said bed for reversing the latter, and means for
driving said reciprocating means in timed rela
tion with said ñrst gear.
11. In mechanism of the class described, a 20
reciprocating bed, a bed r-ack mounted thereon,
a pinion meshing with said bed rack, a shaft for
said pinion, means for driving said shaft in op
posite directions comprising a rotating member
extern-a1 gear for operatively connecting the
crank shaft with the ñrst named shaft for im
parting rotation to said ñrst named shaft in
opposite directions at spaced intervals, and means
having an outer internal gear sector and an` 25
for applying power to said crank shaft.
8. In mechanism of the class described, a
reciprocating bed, a bed rack, a pinion meshing
with said bed rack, a shaft upon which said
30 pinion is ñxed, a rotating member having an
outer internal gear sector and an inner external
gear sector, two pinions mounted on said shaft,
inner external gear sector, two pinions mounted
on said shaft, each of said last named pinions
being adapted to mesh with one of said gear
sectors, a driving rack, means for placing said
driving rack into operative relation with said 30
bed during the end portions of the travel of the
bed only for e‘rïecting reversal thereof, and means
each of which meshes with one of said gear
‘ sectors, the center of said rotating member be
ing spaced l-aterally from said shaft, a pair of
spaced reversing racks mounted in alignment
on said bed, a gear arranged with its axis in the
same vertical plane with the axis of said rotat
ing member adapted to mesh with said revers
40 ing racks during the end portions of the travel
of the bed, a driving rack meshing with said last
named gear, and means geared to said rotating
member for reciprocating said driving rack.
9. In a printing press, a reciprocating bed,
gearing for driving said bed in alternately op
posite directions including two concentric pin
ions, a iirst gear vertically disposed and adapted
to rotate once for each cycle of said bed, a seg
mental internally toothed member and a seg
mental externally toothed member, each of said
segmental members being connected with said
first gear to rotate therewith and disposed on the
same side oi said bed as said iirst gear, each
of said segmental members meshing intermit
55
tently with a corresponding one of said two con
centric pinions for driving said bed in alter
nately opposite directions throughout the major
portion of the stroke thereof, mechanism for
reversing the direction of movement of said bed
60 at the ends of its stroke, -a crank pin for actuat
ing said mechanism, and a second gear rotating
with said crank pin and meshing with said iirst
gear.
l0. In a printing press, a reciprocating bed,
65
gearing for driving said bed in alternately op
posite directions, including two concentric pin
ions, a first gear vertically disposed and adapted
for reciprocating said driving rack during each
complete cycle of the bed an odd number of
times greater than one.
35
l2. in a printing press, a reciprocating bed,
gearing for driving said bed in alternately op
posite directions including a rack carried by said
bed, a first gear in continuous mesh with said
rack, a shaft fixed for rotation with said gear, 40
two pinions fixed for rotation with said shaft,
a second gear vertically disposed and rotating
once for each cycle of said bed, a segmental inter
nally toothed member and a segmental exter
nally toothed member each arranged to rotate
with sai-d second gear and disposed on the same
side of said bed as said second gear, each of
said segmental members meshing intermittently
with a corresponding one of said two pinions for
driving said bed in alternately opposite direc
tions throughout the major portion of the stroke
thereof, mechanism for reversing the direction
of motion of said bed at the ends of its stroke,
including a reversing rack, means for placing
said reversing rack in operative relation with
said bed during the end portions only of the
travel of the bed, a scotch yoke operatively con
nected to said reversing rack for imparting recip
rocating motion to the latter, a crank pin and
crankshaft for reciprocating said scotch yoke,
said crankshaft being driven to turn at three
times the speed of said second gear, whereby said
crankshaft and said second gear are maintained
in timed relation to drive said scotch yoke three
times for each cycle of said bed.
JAMES R. WOOD.
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