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Патент USA US2129972

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Sept. 13,,1938-
B. D. STEVENS ET AL
2,129,972
PRINTING PRESS MECHANISM
Original Filed Dec. 1, 1933
5 Sheets-Sheet l
Sept. 13, 1938.
2,129,972
B. D. STEVENS ET AL
PRINTING PRESS MECHANISM
Original Filed Dec. 1, 1933
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B. D. ‘STEVENS ET AL
PRINTING PRESS MECHANISM
Original Filed Dec. 1, 1933
‘ 2,129,972
'
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Sept.‘ 13, 1938.
B. D. STEVENS ET AL
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PRINTING PRESS MECHANISM
Original Filed Dec. 1, 1933
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B. D. STEVENS ET‘AL
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PRINTING PRESS MECHANISM ‘
Original Filed Dec. 1, 1933
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Edward i’?adifé/ger,
Ernest /J. Vsrru
Patented Sept. 13, 1938
' 2,129,972
UNITED- STATES ‘PATIENT. OFFICE
2,129,972
PRINTING PRESS MECHANISM
Burt D. Stevens, Chicago, and Edward F. Dudley,
Oak Park, Ill., and Ernest A. Verrinder, Bed
lands, Calif., assignors to Mlehle Printing Press
and Manufacturing Company, Chicago, 111., a
corporation of Illinois
‘Original application December 1, 1933, Serial No.
700,416. Patent No. 2,085,833, dated July 6,
1937. Divided and this application April 15,
1931, Serial No. 136,998
2o
,(01. 271-46)
way of example in the accompanying drawings,
This invention relates to a printing press and,
while adapted for use on various types of print
ing presses, it ?nds particular application in con
nection with presses of the sheet-fed, bed-and
5 cylinder class in which two or more single color.
printing units are arranged in tandem to provide
> a press for producing multi-color work.
4 In multi-color printing presses, particularly of
in which:
,
Figure 1 is a. side elevation of two single color
printing units combined into a two-color printing
press and embodying the features of this inven- 5
tion;
,
Figure 2 is a plan view of the forwarding table
which receives sheets from the delivery conveyor
of the ?rst unit and on which the sheets bearing
the bed-and-cylinder class, a transfer cylinder is
10 arranged between the impression cylinders of two
adjacent printing units for the purpose of trans
the ?rst impression are again registered before 10
they are passed into the second unit to receive the
second color impression;
ferring the sheets from the impression cylinder
Figures 3, 4 and 5 are sectional views taken
of one color unit, after having received their ?rst
along lines 3-4, H and 5-5, respectively, of
impression therefrom,-to the impression cylinder
Figure 2;
15 of the other unit to receive their second color
impression,
_
_
.
15
Figure 6 is an enlarged sectional view of the
~
Such arrangements have the disadvantage fort driving mechanism shown in Figure 5;
Figure 7 is a cross section taken along line '|—-'l
instance that any variation in the register which
of Figure 6; showing also the drive shaft for the
frequently develops during the printing of a job
driving mechanism;
“
20
Figure 8 is a cross section taken along line 8-4
20 due to shrinkage or stretching ‘of the stock and
other causes, cannot be corrected without con
of Figure 6;
siderable loss of time, because on that type of
presses such correction requires accurate and
arrangement used for forwarding and controlling
tedious readjustments of the sheet controlling
the sheets of stock while passing over the for- 25
25 means and other parts involved.
Furthermore, because of the several color im
pressions being applied to the? sheets in quick suc
warding table shown’in Figure 2;
A
»
Figure 11 is a cross section taken along line
li—il of Figure 10; and
cession, no drying time is provided between each
- color impression, resulting in smutting of the first
30 impression during the transfer of the sheets from a
one impression cylinder to the other with the
printed side of the sheets facing the transfer
cylinder.
.
Figures 9 and 10 are details of the suction wheel
,
Moreover, it is impossible to observe the ?rst
35- impression and color setting on a sheet, because
the sheet, at the time it again becomes visible to
the pressman, after having been fed to the press,
has received the impressions from all of the color
units.
40
It is therefore the primary object of the present
invention to eliminate the disadvantages referred.
to above by the provision of a press in‘ which for
the conventional transfer cylinder a novel sheet
transferv and controlling means is substituted
45 which will make it possible to observe the im
_ '
Figure 12 is a sectional view taken along line,
|2--l2 of Figure 10.
'
30
Referring now to Figure 1, each printing unit
has a frame II, 20', respectively, which frames
are rigidly held in spaced relation to each other
by means of a base plate 2i. The ?rst unit A is
provided with an automatic feeder 22 from which 35
sheets ‘of stock to be printed are fed‘ to the im-/
pression, cylinder 23 in any known conventional
manner. After a sheet has received its impres
sion from the form on the bed 24 of the ?rst unit,‘
the sheet is taken over by the delivery conveyor 40
25 which ‘in the preferred form illustrated is’ of
the endless chain and gripper type. Thiscon
veyor deposits the sheet bearing the ?rst impres
sion onto av forwarding table ‘26 on which‘ the sheet
will be slowed down and re-registered prior to 45
receiving its/second. impression, ‘as will be ex
pression of a sheet as_ it comes from the ?rst color ,plained hereinafter in detail.
, unit, provide ample time for the ink of the ?rst
Upon having been properly registered on said
or any preceding impressions to dry before a suc
forwarding table, thesh'eet is transferred to the
ceeding impression is applied, as well as to readily " impression cylinder 23' of the second unit by any 50
50 correct any variation in the register of the impres
sions.
‘
'
'
These and other objects set forth hereinafter
are accomplished by the arrangement disclosed
.55 in the following description and illustrated by
convenient means, preferably, however, by a ro
tary or an oscillatory stop gripper mechanism,
whereby the sheet is engaged 'while at rest in
registered position on the forwarding table and
transferred to the impression cylinder grippers at l
4
2
2,129,972
impression cylinder speed. After the sheet has
received its second impression on the unit B, it is
taken over by the delivery conveyor 25' of the
second unit, and subsequently deposited onto the
5
10
15
20
25
30
pile delivery 21.
'
until the leading edge of a sheet is presented to
the front guides, the rotation of said wheels will
be decelerated so that they will have assumed
their lowest speed and thereby have sufficiently
slowed down the sheet by the time it reaches the 5
front registering guides to assure smooth contact’
of its leading edge with said guides. The train
By the provision of a forwarding table between
adjacent printing units, in addition to the endless
conveyor shown, ample time is provided for the ‘ of gears whereby this variable rotation of the
shaft 1615 produced may be covered by a guard C.
ink of one impression to dry before a sheet receives
Suction is applied to the forwarding wheels 42,
its successive impression. The pressman may
also readily observe the color setting, etc., of any . 43 and 44 in timed relationship and‘preferably
impression while thev sheets printed side up are controlled by the means illustrated in Figures 2
>
on the forwarding table during their transfer from and 5 to 8.
In the housing 12 is provided a bore 13, see Fig
one printing unit to another.
ures 6 and 8, into which is threaded a nipple 14
It will also be understood that by the arrange
ment of accessible registering means on the for- . for connection with ‘the main air line 15, which
leads to any conventional vacuum system such as
warding table, which means may be of any con
ventional type, variations in the register, that ' a pump on the press. Air vents 16 extend from
the bore 13 to the inner face 11 of said housing.
might develop during printing, can be con
Referring‘ now particularly to Figures 6 and 8
veniently corrected with the least possible loss of
of the drawings, the housing 12 is provided with
time.
The forwarding table 26, a plan view of which three bores 16 into which are driven studs 16,
is shown in Figure 2, has mounted thereon a 66 and 6|, each of which has a reduced portion 82
series of sets of suction, i. e., forwarding wheels which projects beyond the face '|'| in the housing
42, 43 and 44, preferably of the construction ‘I2 in order to provide bearing journals for the
air control valve gears 63, 84 and 65. These
shown in Figures 9 to 12, which ?gures will be de
scribed later- The latter two sets of said wheels gears are held in position on their respective
journals by means of a cover plate 86 secured to
are rotated at a uniform speed, .while the wheels 42
are given a variable speed of rotation in order to. the housing 12 preferably by bolts 61 and sult
ably spaced from the face 11 in any convenient
slow down a sheet prior to its reaching its reg
istering position.
.
Rotation is imparted to all of said forwarding
wheels from any convenient part of the press
drive, preferably by means of a shaft 45 and a
35 bevel gear 46, see Figure 5, whichv gear extends
into the drive case 41 mounted on one side of the
table 26, see Figure 2.
The shafts 48 and 49, which carry the suction
_‘ wheels 43 and 44 respectively, extend through the
40 side wall or ?ange 56 of the forwarding table
26, and the bevel pinions 5|, 52 keyed to the free
ends of said shafts mesh with complementary
bevel pinions 53 and -54 carried by the shaft 55,
which is continually rotated at a uniform speed
45 from the drive shaft 45, through the intermediary
of the bevel pinion 56, pinion 51 and bevel pinions
manner so that said gears will be free to rotate be
tween the face 11 and the plate 66. Each one of
said gears functions as a valve to control the
vacuum to the respective suction wheels in the
forwarding table 26, and for that purpose airv
openings 66 are provided in said gears in such
position that once during every revolution of a
gear the opening 66 therein will align itself with
its corresponding air vent in the housing 12. In
the cover plate 66 and in alignment with said air
vents 16 are tapped holes 88 into which are se
cured nipples 66 of air lines 6|, which latter. lead
to the respective-suction wheels in the forwarding
table 26. It will be understood, therefore, that
vacuum will only then be applied to said suc
tion wheels when the holes 68 in the cover plate,
air openings 66 in the valve gears and air vents
56 and 59.
,
16 in the housing 12 are in alignment.
As indicated above, the suction wheels 42, lo
Said valve gears intermesh and are driven to
cated near the front end of the forwarding table
50 26, are not rotated at a uniform speed but are rotate continually in one direction by a gear 82,
driven at a variable speed for the purpose of see Figures 6 and 7, carried by the cam shaft 66
slowing down a sheet prior to it being presented to , and held against rotation on the hub 63 of the
the registering guides. The mechanism whereby worm wheel 6| by means of a pin 94 driven into
the variable speed is accomplished is shown in said hub, the worm wheel» 6| being splined to the
55 Figures 2, 3, 5, 6 and 7. The cam shaft 66 which shaft 66 by a key 65 and secured in position by a
constitutes the drive shaft for said mechanism, set screw 66 in said hub and bearing against said
carries at one end a helical gear or worm wheel
6|, see Figures 6 and 7, which wheel meshes with
a helical gear or worm 62 provided on the con
60 tinually rotating shaft 55.; At the other free
. end of the shaft 66 is mounted a centroidal gear
63, Figures 2 and 3, which in turn meshes with a
complementary centroidal gear 64 mounted for
rotation, together with a pinion 65, on a stud 66
G5 threaded into the side of the table 26. Pinions
61 and 68, which are integral and mounted for ro
tation on stud 69, preferably driven into a bore
in the table 26, transmit a variable rotation to
the solid shaft 16 and therewith to the suction
70 wheels 42, by means of a pinion ‘H which is se
cured by any convenient means to the reduced free
end of the solid shaft 16. The timing of the
centroidal gears, of course, is such that the suc
tion wheels 42 rotate at top speed at the moment
75 when a sheet reaches them, while from then on
key.
The speed at which the air control valve gears
63, 84 and 65 are driven is such that for every
sheet fed to the printing couple of the second unit
of the press, each of said wheels will perform
one complete revoution. As will be understood
from the location of the air openings 68 in said
wheels and indicated in Figure 6, vacuum will
?rst be applied to the wheel 63 during that period
when its air opening 66 is in alignment with its
corresponding air vent 16 in the housing 12
and with its corresponding tapped hole 86 in the
cover plate 86.
At that time no vacuum will b
applied through the air openings 88 either i
wheel 64 or wheel 85. When the opening 86 i
wheel 63 is about to pass beyond its correspond
ing air vent ‘I6, then the opening 88 in wheel 6
will commence to move into alignment with it
corresponding air vent ‘l6 and through its ai
11
1
2
ma
2,129,972
line 9! will apply vacuum to‘ the second set 43
of the suction wheels in the forwarding table 26.
By the time the vacuum to the suction wheels
£143 is cut o? by the continued rotation of the valve
gear 84, the opening 88 in gear 85 will have moved
into alignment with its corresponding air vent ‘i6
and thereby apply vacuum to the front suction
wheels 132 in the forwarding table through the air
10
line 9| leading thereto.
As indicated in Figure 6, the opening 88 in the
wheel 85 is of an elongated shape, the purpose of
which will be apparent from the following de
scription.
The suction wheels 63 and lid function merely
to advance the sheets over the forwarding table
26, while the wheels ‘52, in addition to advancing
the sheets over said table, act to control them
during that period when the sheets are being
given their front and side registering movement.
20 In order to accomplish this, it is essential that
3
It might also be mentioned here that the vac
uum at the air wheels M is so timed with the
grippers on the delivery conveyor 25 that'before
said grippers release the sheet, suction will have '
been applied to said wheels so that the sheet may 5
be under positive control during its transfer from
the delivery conveyor to the forwarding table 26.
In order that sheets to be registered will not be
thrown out of alignment with the front reg
istering guides during the side registering of the 1O
sheets, the front suction wheels 62, in addition
to their rotary motion have a lateral movement
while a sheet is under their control, which move
ment is accomplished by means of a cam NH
mounted on the cam shaft 60, see Figure 2. A 15
rocking lever “22 pivotally mounted on abracket
803 is secured to the side of the forwarding table
and which lever at one end carries a roller ltd
engaging in the cam groove ‘M35 of the cam mi,
while the other end of said lever is provided with AG
means be provided whereby the air pressure, 1. e., a gear sector we engaging the teeth of a rack
the vacuum, to the wheels 32 can be suitably member 881', secured to, the hollow shaft 808, on
varied to accommodate stock of different weights. whichthe suction wheels 432 and associated parts
The preferred form of such means is illustrated are arranged as a unit to move therewith lat
25 in Figure 5 of the drawings and includes a by
25
erally.
I
'
pass tube 97, which provides a direct connection
In order that the wheels 132, which rotate with
between the main air line ‘i5 and the front suc ' the shaft ‘i0, may readily slide longitudinally of
tion wheels 62. The air pressure within the tube said ‘shaft to follow the lateral movement of the
9? is controlled by means of a petcock 98, which shaft I88, they may be splined to the latter shaft
30 together‘ with a relief valve 99 are interposed
by means of a key and a key-way or in any other
between said tube and the main line ‘£15.
preferred manner. During the rotation of the
A ‘second relief valve 9% is mounted on the shaft 60, which carries the cam IN, the lever Hi2
cover plate 12 and has for its purpose to establish will be rocked and consequently the wheels 62 will
direct communication to the atmosphere through be moved laterally to and fro on the shaft ‘E0.
an air port provided in said plate and located in The lateral movement of said wheels of course
such position that once during every revolution of occurs after suction has been cut vo?‘ on the
the air control valve gear 85, it will come into wheels 133 and 45, so that the sheet will be en
alignment with the air opening 89 in said gear tirely under the control of the wheels I32. Fur
and thereby brake the vacuum to the suction thermore, it will be readily understood that the
40 wheels 62. The timing of the relief valve me
suction in the wheels a2 will be timed so that dur
with the opening 88 in the gear 85 being such ing the return lateral movement of said wheels,
that when the leading edge of a’sheet is about namely, during the in movement to the left, as
one-half inch from the front registering guides viewed in Figure '2, no suction will be applied to
of the press, the vacuum applied to the wheels said wheels.
52 will be relieved for the purpose of avoiding
The side guide i081, which may be of-any well 45
buckling of the sheet when its leading edge known conventional construction, is imparted its
reaches the front registering guides.
lateral movement‘preferably by means of a. cam
‘By the time the sheet has reached its register
Hi! pinned to the cam shaft 66, which cam en
ing position, vacuum through the valve gear 85 gages a roller Hi mounted on a stud M2 car
will have been cut off completely and the wheels ried by a fork M3, the stem tilt of which is piv< 50
.62 will thereupon be in direct communication with otally connected to abell crank lever I it, one arm
of which is provided with a gear sector H6 engag
' the main air line 75 through the auxiliary by
pass tube 91. The amount of ‘suction applied ing in a rack bar H‘? adapted to reciprocate in
to the sheet through said tube being controlled ' the front end of the forwarding table 26 and one
55
by the setting of the petcock 98, only su?icient
suction is required to hold the sheet down after
it has been registeredv and to thereby prevent
displacement of the sheet, also to prevent the side
guides from pulling the sheet away from its front
60
registering guides during registering movement of
said side guides.
_
The setting of the petcocl: 93 is constant for
the majority of stock handled on presses of this
type, but for extremely ‘light stock, for instance,
65 or cardboard, the volume-of air pressure in the
by-pass tube 51 may be suitably varied.
The relief valve 99 is used for relieving the
suction in the main line 15 and thereby in the
suction tubes on the forwarding table when ex ‘
70 ceedingly light stock, suchas tissue paper, is
handled on the press. By suitable adjustment of
the relief valve 99, the vacuum can be held to a
minimum vso that during the forwarding of such
exceptionally light stock the paper willlnot be
-75 sucked into the air vents of the suction wheels. '
end of which carries the side registering guide 55
E09.
The arrangement illustrated in Figures 2 and 4
functions to side register a sheet in a direction to
the right of Figure 2. This condition, however,
may be reversed simply by turning the cam mi 60
180° on the'shaiftv 60 and by also mounting the
side registering guides m9 at the left hand side of
the rack bar In instead of at the right hand side
as shown in ,Figure 2.
While any suitable type of suction wheels may'
be used in connection with this invention, a pre
ferred construction is illustrated in Figures 9 to
12 inclusive. according to which each forwarding
wheel unit comprises a. series of discs I it, provided
with perforations H9 and slots'lm, one of which
extends from'every perforation to the periphery
of the discs. Each one of said discs is secured
to the shaft 10, preferably by a key MI .in order
to rotate with said shaft. On the hollow station-_
ary shaft I08 are'mounted onnecting brackets 75
2,129,972
4
I22 which are secured against lateral displace
ment on said shaft by means of set screws I23
or the like and in such position that the bore I24,
provided in each bracket, will communicate with
a port hole I25 in said shaft. Lateral air vents
I26 extend from the inner end of the bore‘ I24 to
each side face of the brackets I22, which vents in
turn communicate with the perforations III! in
the discs II8 through ports I21 provided in seal
10 ing discs I28. These discs are secured against
rotation with the shaft 10, preferably by means of
a pin I29 driven into the bracket I22 and extend
ing on both sides thereof into bores ‘I30 provided
in the discs I28. By means of these discs an air
15 tight seal is provided between the bracket I22 and
the discs or wheels H8. The outer faces of said
wheels are sealed by means of discs I3I loosely
mounted on the shaft ‘I0. In order to maintain
20
constant sealing condition between the bracket
I22, wheels H8 and sealing discs I28 and I3I,
compression springs I32 are interposed between
the latter discs and retention collars I33, which
are adjustably mounted on‘the shaft 1d and are
held in position by means of set screws I34,
25 whereby the tension of said springs, and there
with the degree of pressure applied between said
wheels and sealing discs may be suitably varied,
With this arrangement it is possible to readily
dismantle the entire suction wheel unit for re
placement of any parts or for cleaning purposes.
In order to facilitate cleaning out of the bore
I24 ‘in the brackets I22 an opening is provided
to communicate with the inner end of said bore
and which opening is normally sealed by means of
35 a screw I35.
It will be apparent from this disclosure that
during the rotation of the shaft 10 and therewith
of the wheels H8, the perforations H9 in the lat
ter will successively come into alignment with the
40 ports I21 in the discs I28 so that suction will be
applied through the corresponding slot I20 of
each perforationas it passes the port I21. Each
hollow shaft I 08 of the different suction wheel
units is connected to its respective suction con
trolling means by' way of air lines SI as indicated
in Figures 2 and 8.
_
4. In a printing press, the- combination of a
forwarding table, front registering means, side
registering means, sheet controlling means asso
ciated with said table and comprising one series
of suction wheels driven at a uniform speed to in
advance a sheet over said table, a second series
of suction wheels driven at a variable speed,
means whereby suction is applied to both of said
series of suction wheels in timed relation to each
other, and means whereby-said. second series of
wheels is given a lateral motion to move a sheet
toward said side registering means as it ap
proaches said front registering means.
5. In a printing press, the combination of a
forwarding table, front registering means, side 15
registering means, sheet controlling means asso
ciated with said table and comprising a plurality
of sheet conveying elements operated in timed
relation to each other, and means whereby some
of said elements are given a lateral motion to 20
move a sheet against said side registering means
as it approaches said front registering means.
6. In a printing press, the combination of a
forwarding table, registering means, sheet con
trolling means associated with said table and 25
comprising a series of suction wheels, means
whereby suction is applied to said wheels in timed
intervals to advance a sheet and control it as it
approaches said registering means, and means to
vary the amount of suction applied to said 30
wheels.
7. In a printing press, the combination of a
forwarding table, registering means, sheet con
trolling means associated with said table and
comprising a series of suction elemen , means
whereby suction is applied to said elements at
timed intervals to advance a sheet and control
it as it approaches said ‘registering means, and
means to vary the amount of- suction applied to
40
said elements.
8. In a printing press, the combination of a
forwarding table, registering means, sheet con
trolling means associated with said tablevand
comprising a series of suction wh
, means
whereby suction is applied to said wheels in timed
intervals to advance a sheet and control it as it
approaches said registering means, and means
This application is a divisional of our‘applica
tion which has issued as Patent No. 2,085,833
to vary the amount of suction applied to some of
under date of July 6, 1937.
What is claimed is:
v
other wheels.
'
-
1. In a printing press, the‘ combination of a
said wheels without affecting the suction to the
50
I
9. In a printing press, the combination of a
sheet forwarding table, a plurality of sheet con
forwarding table, registering means, sheet con
trolling means associated with said table and
comprising a series of sheet conveying elements,
means whereby the speed of some of said ele
veying elements carried by said table, means'to
forwarding table, registering means, sheet con
trolling means associated with said table, a plu
means, sheet controlling means associated with
impart to said elements different speeds, and
means whereby some of said elements are given a
ments is varied to slow down a sheet and control lateral movement. press, the combination of a.
10. In a printing
it as it approaches said registering means, and ' plurality
of printing units, a forwarding table
means for imparting to said latter elements a located between adjacent units and adapted to
lateral motion.
receive sheets of paper from one of said units and 60
2. In a printing press, the combination of a forward them to the- other unit, registering
said table and comprising a series of suction
rality of suction wheels, means to drive some of wheels, and means whereby suction is applied to
said wheels to advance a sheet over said table ' said wheels in timed intervals to advance a. sheet 65
' at a uniform speed, means to drive other of said and control it as it approaches said registering
wheels at a variable speed to control a sheet
as it approaches . said registering means,‘ ‘and
means.
1
,
11. In-a printing press, the combination of a
means whereby suction is applied to said suction
plurality of paper handling units, a forwarding
wheels in timed relation to'each other.
70
3. In a printing press, the combination of a table adapted to receive sheets of paper from
one
of
said
units
and
transfer
them
to
another
forwarding table, registering means, sheet con
unit, registering means, sheet controlling means
trolling means associated with said table, a plu
rality of suction wheels, means to drive some of associated with said table and comprising a. series
said wheels at a variable speed to control a sheet _ of sheet conveying elements, means whereby the 75.
speed of some of said elements is varied to slow
as it approaches said registering means.
‘2,129,972
_
5
down a sheet andcontrol- it as it approaches said . plurality of paper handling units, a forwarding
registering means, and means for imparting to table adapted to receive sheets of paper from
said latter elements a lateral motion.
,
one of said units and transfer them to another
12. In a printing press, the combination of a unit, registering means, sheet controlling means
5 plurality of paper handling units, a forwarding
associated with said table and comprising a series
table adapted'to receive sheets of paper from one . of suction wheels, means whereby suction is apé
of said units and transfer them to anotherunlt.
registering means, sheet controlling means asso
ciated with said table, a plurality of suction
10 wheels,‘ means to drive some 'of said wheels to
advance a sheet over said table at a uniform
speed, means to drive other of said wheels at a
variable speed to control a sheet as it approaches
said registering means, and means whereby suc
15 tion is applied to said suction wheels in timed
relation to each other.
13. In a printing press, the combination of a
plurality of paper handling units, a forwarding
table adapted to receive sheets of paper from one,
no of said units and transfer them to another unit,
registering means, sheet controlling means asso
ciated with ‘said table, a plurality of suction
wheels, means to ririve some of said wheels at a
variable speed to control a sheet as it approaches
as said registering means.
.
7
‘
(14. In ‘a printing press, the combination of a
plurality of paper handling units, a forwarding
table ‘adapted to receive sheets ‘of paper from
.one of said units and transfer them to another
son-unit, front registering means, side registering
I means, sheet controlling means associated with
said table and comprising one series of suction
wheels driven at a uniform speed to advance a
sheet over said table, a second series of suction ~
I 3‘ wheels driven at a. variable speed, means whereby .
plied to said wheels in timed intervals to ad
vance a sheet and control it as it approaches said
registering means, and means to vary the amount
of suction applied to said wheels.
I 10
17. In a printing press, the combination ofv a
plurality of paper handling units, a forwarding
table adapted to receive sheets of paper from one
of said units and transfer them, to another unit,
registering means, sheet controlling means‘ asso 15
ciated with said table and comprising a series of
suction elements, means whereby suction‘ is ap
plied to said elements at timed intervals to ad
vance a sheet and control it as it approaches
said registering means, and means to vary the 20
amount of suction applied to said elements.
l8. In a printing press, the combination of a
plurality of paper handling units, a forwarding
table adapted to receive sheets of paper from one
of said units and transfer them to another unit‘, 25
registering means, sheet controlling means asso- .
ciated with said table and comprising a series of
suction wheels, means whereby suction is applied
to said wheels in timed intervals to advance a , '
sheet and control it as it approaches said regis 30
tering means, and means to vary the amount of
suction applied to some of said wheels without
affecting the‘ suction to the other wheels.
-19. In a printing press, the combination of a
plurality of sheet handling units, a sheet for 35
suction is applied to both ‘of said series of suc : warding table located between adjacent units
tion‘ wheels in timed relation to each other, and . and adapted to receive sheets of paper from one
means whereby said second series of wheels is
given a lateral motion to move a sheet toward
‘40' said side registering means as it approaches said
'
front registering means.>
-
-
of said units and forward them to the other unit,
rotary sheet 'ccnveying‘e‘lements carried by said
table, and means for imparting to said elements
40
a variable speed.
15. In a printing press, the combination of a
20. In a printing press, ‘the combination of a plurality of paper handling units, a forwarding plurality of sheet handling units, a sheet for
table adapted to receive sheets of paper from warding tables located between adjacent units
45 one of said ,units and transfer them to another‘ and adapted to receive sheets of paper from one
unit, front registering means, side registering of said units and forward them to the other 45
means, sheet controlling means associated with unit, a plurality of sheet conveying elements car
said table and comprising a plurality of sheet ried by said table, means to impart to said ele
- conveying elements operated in timed relation to
50 each other, and means whereby some of said ele
,
ments different speeds, and means whereby some. ‘
of said elements are given a lateral movement.
ments are given ’a lateral motion to move a sheet .,
toward said side reglsiii?rlng means as 'it ap
proaches said front registering means.
16. In a printing press. the combination of a
Bma'rm. STEVENS.
EDWARD F? DUDLEY. '
ERNEST A. vnnnmnnn.
50
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