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Патент USA US2548123

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Aprää [email protected] WSE
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Filed May 20, 1947
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Patented Apr. 10, 1951
2,548,l 19
» George H. Pembroke, New York, N. Y.
Application May 20, 1947, Serial No. 749,120.
11 Claims.
My present invention is an improvement of'my
application Serial No. 687,846 ñled August 2, 1946,
for Silk Screen Printing Apparatus, which appli
cation is now abandoned, and relates to stenciling
apparatus and more particularly to apparatus
primarily designed for utilization in connection
with silk screen processes.
(Cl. 101-126)
ative lin timed relation to the lowering of the
screen vframe on to the blank on the table, the v
said ink applying means being operative in one
direction when the frame is ñrst lowered, halting
its operation when the frame is raised and be
ing operative inv the opposite direction when the
frame is lowered once more.
A primary object of my invention is the pro
In connection therewith, another object of my
vision of a stencilling machine of the silk screen
invention is the provision of novel ink applying
type with a horizontal table to receive the sheet 10 operating means, the direction of operation oi’
upon which the stencil is to be marked and with
which will be automatically altered when the
a frame for holding the silk screenor other sten
screen frame is raised at the end of the inking
cil; the said frame being alternately raised and
~ lowered automatically in timed relation to the
smoke in che direction.
Another object of my invention is the arrange
feeding of the blank onto the table and to the 15 ment of ink applying means comprising a single
movement of the ink spreader apparatus over the
spreader so constructed that it will be auto
A further object of my invention is the pro
vision of novel apparatus for raising and lowering
the frame for the silk screen or other stencil, the
said means comprising a single oscillating lever
movable in one direction to raise the screen vframe
and in the other direction to lower the screen
matically shifted to a trailing position each time
the screen is raised for sheet delivery and sheet
feeding purposes at the end of an inking stroke,
Another improvement embodied in my present
invention includes novel adjustable sheet Afeeding
means, novel sheet registering means and novel
sheet delivery means.
frame in conjunction with appropriate yielding
The foregoing and many other objects of my
means to maintain the screen frame in the raised
invention will become apparent in the following
or lowered positions for predetermined timed in--
description and drawings in which:
Figure l is a side view taken from the right
side of my novel silk screen printing device taken
from line I-»I of Figure 3.
member or crank pin connected to the lower end
Figure 2 is a side View taken from the left side
of an oscillating lever, providing a forward and
of my novel silk screen printing device taken
backward stroke, which in turn at the upper end
from line 2_2 of Figure 3.
connects with an oscillating shaft also having
Figure 3 is a top plan View of my novel silk
a forward and backward movement, but a longer
screen printing machine.
stroke than the cam or eccentric stroke itself.
Figure 4 is an end elevation of the feeding end
This is accomplished by means of pivoting the 35 of my novel silk screen printing device.
lower end of the lever and connecting the lever
Figure 5 is a plan View partly in cross section
to the eccentric off center, nearer to the pivot
or" the operating mechanism for my novel silk
point, providing about double the throw to the
screen printing machine taken from line 5--5 of
lever as compared to the eccentric throw.
Figure 1.
The eccentric lever with a fork-shaped head e
Figure 6 is a plan view partly in cross section
plays at the upper end between two collars on an
of specific silk screen printing table operating
oscilla'î‘ing'shaft, which shaft controls the raising
elements taken from line 6-6 of Figure 1.
and lowering of the screen frame.
Figure '7 is a plan View corresponding substan
A speciñc improvement in my present inven
tially tothe plan View of Figure 6 showing, how
tion comprises the connection between the oscil
ever, the relationship between the paper clamp
lating bar operated by the eccentric lever and the
at the left side of the printing table and the paper
screen table itself. The oscillating bar is con
stop at the rear end of the printing table.
nected by a chain to sprockets at opposite ends
Figure ~8 is an elevation partly in cross-section
of the` machine frame, which sprockets in turn
taken from line 8~-8 of Figure 3 showing the
are connected by a crank pin and connecting'links
printing table, >the silk screen frame and the
to the screen frame, thereby operating to raise
scueegee apparatus.
and lower the frame in accordance with the oscil
Figure 9 is a side view of a portion of the paper
lation of the eccentric lever.
'feed element taken from line 9--9 of Figure 10.
Another object of my invention is the provision 55
Figure 10 is :a top plan View partly in cross
of novel ink applying and spreading means oper
section taken from line ville-lli of Figure 1.
Essentially, the means for raising and lowering
' the screen frame comprises a driven eccentric
Figure 11 is a schematic View showing the drive
for the feed and registering belts on the printing
table which drive is under the control of the
feed apparatus shown in Figures 9 and 10. The
position of Figure 11 corresponds to the unen
gaged position of the gear and clutch mechanism
of Figure 10.
Figure 12 is a schematic View corresponding to
that of Figure 11 showing the feed belts of Figure
11 raised in order to perform the intended op
eration of moving the paper on to the table in
the proper position thereon. When the belt has
been raised to the position of Figure 12, the
driving elements of Figure 10 are engaged. At
the same time, the idling roller at the delivery
end of the belt has been raised as shown in Fig
ure 14 to raise the belts above the level of the
table to cause them to feed the paper.
, Figure 173 is a cross-sectional View taken on
Figure 28 showing the screen carrier frame in
the down position.
Referring now to Figures 1 to 5, the machine
comprises a main frame having principal vertical
posts I0, II, I2,and I3.
The legs I2 and I3 are connected at their lower
ends by longitudinal side frame members I5 and
IS and at their upper ends by the longitudinal
side members I8 and I9 which define the sides
of the work table 20.
The frame is also provided with the lower cross
members 22 and 23 connecting, respectively, the
legs I2 and II at the delivery end and the legs
I3 and I0 at the feed end of the machine. The
legs E0 and I3 at the front end and II and I2
at the delivery end are interbraced in any suit
able manner to provide supports for additional
elements including the longitudinal intermediate
frame members 25, 25 which carry the upper sec
tion of the operating mechanism.
The -front of the machine is also provided with
a frame extension 30 comprising the longitudinal
bars 3 I, 3| and the cross bars 32 and 33 supported
ing to the schematic position of Figure 11.
at the front end by the legs 34 and 35 and at the
Figure 14 is a View corresponding to that of
Figure 13 but showing the up or operating po 25 inner end between the front leg members I0
and I3.
sition of the idling roller at the delivery end of
The front frame 30 provides a suitable sup
the table corresponding to the schematic view
port for the stacking table 40 on which the sheets
of Figure 12.
M to be fed into the mechanism are mounted
Figure 15 is a side elevation of a portion of the
screen carriage showing the squeegee carriage at 30 against the side guage 42. The table 40 is ad
justable vertically in order to register a desired
the end of its stroke; this View corresponds to
portion of the stack 4I with the feeding slat- 45
Figurer showing the squeegee carriage, how
on to which the paper sheets are first pushed to
ever, at the right hand end of Figure 1 rather
be engaged by the feed-in roller 56, the operation
than at the left hand end as in Figure 1.
of which is hereinafter described.
' Figure 16 is a plan view of a corner of the
Adjustable support for table 40 comprises the
screen carriage corresponding to the upper left
support 56 which includes the upper
hand corner of Figure 3 showing the squeegee
links 5I and 52 and the lower links 53 and 54.
carriage moved from the right-hand end of Fig
The lower end of link 51'5 may be pivotally secured
ure 3 to the left-hand end of Figure 3.
at 55 to a suitable support 56 cn the lower plat~
Figure 1'7 is a detail plan view of a portion of
form 35. The lower end of link 53 may be pivot
the upper right-hand corner of Figure 3.
ally secured at 5? to the element 53. Link 53a
Figure 16 is an elevation partly »in cross-section
.is connected between pivot 58 on link`54 and
taken on line IB-*IS of Figure 16.
line I3-i3 of Figure 3 looking in the direction
of the arrows and showing position of the idler
roller at the delivery end of the table correspond
Figure 19 is a cross-sectional view taken on
line Iii-I9 of Figure 3 looking in the direction
of the arrows and showing the alternate positions
of the squeegee.
Figure 20 is a side elevation partly in cross
section taken on line 20--20 of Figure 8 looking
in the direction of the arrows.
Figure 2'1 is a cross-sectional view showing the
operating elements of the squeegee carriage taken
on line 2I---2I of Figure 20 looking in the direc
tion of the arrows.
Figure 22 is an enlarged top plan view of the
left-hand end of the printing table showing the
clamp and stop operating elements and is taken
on line 22-22 of Figure 23.
Figure 23 is a side view taken on line 23-23 of
Figure 7.
pivot 6I.
The upper links 5I and 52 are pivotally secured,
respectively, at pivots 66 and 5I to the lower links
53 and 541. The links 5I and 52 are pivotally se
cured at 55, 65 to the underside of table 4D. Link
52a. is connected between pivot E3 on link 5I and
pivot 62.
A pair of extensible support elements 50 may
be used on each side with their pivots 6B and 6I
appropriately interconnected for simultaneous
operation. The pivots 60 and 5I include a nut in
one element through which is threaded the screw
lil having the crank handle ‘II and a collar in the
other element rotatably holding screw 79. Turn
ing the screw 'I6 by the crank handle 'I I will result
in collapsing or extending the extensible member
60 53 and thus raising or lowering the feed table 40.
The additional feeding element which times the
feed of the paper into the machine by means of
the operation of feed roll 46 with respect to the
feedingr slat 45 will be further described after
Figure 25 is a cross-Sectional View taken on
65 other basic elements of the machine have been set
line 25-25 of Figure 24.
Figure 26 is a cross-sectional View taken on
As seen in Figure 4, a pair of extensible ele
line 26-26 of Figure 3 looking in the direction
5S, 56 is provided with each side of the feed
of the arrows with the screen carrier down.
table 46. While a screw ‘Iû is needed on both
Figure 27 is a View corresponding to that of
70 sides, only one of the screws 16 need have the
Figure 26 showing the screen carrier up.
handle TI. Each of the screws 'Iü may be pro~
Figure 28 is a cross-sectional view taken on
vided with. a sprocket T3, 'I3 connected by a chain
line ZS--ZS of Figure 3 showing the sheet regis
T4 for common operation.
tering unit with the screen carrier frame in the
Figure 24 is a View corresponding to that of
Figure 22 showing the released position of the
elements thereof.
up position.
Figure 29 is a view corresponding to that of
A motor 65 drives the pulley 8| (see especially
Figure 5 as well as Figure 1) which through the
belt 32 drives pulley 33 secured to shaft 84 rotat
able in bearings 85, 86 secured on the lower longi
tudinal frame members I5 and I e.
connected to the front end of the screen frame. I 35
alternately to rise and fall> from the position of
Figure 1 to the position of Figure 2 and back
en shaft 3e meshes with and drives
gear 89 on shaft 93, which shaft is also rotatably
mounted in bearings 33 and 9d on the lower frame
livery end of the mechanism are connected by the
members I3 and I5. Gear 96 on shaft 33 meshes
short cranks |50 on their shaft and the long links
with and drives gear 5l on shaft 38 rotatably
|6| to the push rods |52 which in turn are con
secured in bearings 39 and |33 across the lower
nected to the delivery or rear end of the screen
frame members I5 and I 5.
II) table |30 on each side.
Sprocket |32 on shaft §53 drives sprocket |03 on
Consequently, the operation of sprockets |39
shaft |02 through the chain |55. Shaft IM is
and |38 will alternately cause the rear end of
the screen frame |30 to rise and then fall, Links
|5| and cranks |45 at the front end are, respec
rotatably mounted in bearings |33 and I5? on the
lower frame members I5 and I Si.
The outer end of shaft Illfl beyond the lower
frame members I5 and i3 carries the crank discs
H3 and II I, respectively. Each of the crank
discs IiIì and III is connected by the link |I2, II3
to the oscillating arms EIII and >SI5 on opposite
tively, longer than links I6! and cranks |60 at
the delivery end so that when the screen frame
|30 rises, the front end rises higher than the rear
end, as seen particularly in Figure 2. This makes
it possible for .the operator of the machine at
- sides of the machine.
the front end better to observe the action of the
Each of the arms liíi and i 5 is supported on
apparatus on the paper sheet to which a stencil
its lower frame member i5 and i5, respectively,
is being applied and also makes access to the
table easier for the operator.
by the downwardly depending ‘il-shaped bracket
H5, §99 having the pivot |25 and secured to the
This also makes it easier to insert a silk screen
in the screen frame |35 in the manner previously
described in connection with my prior application
lower frame member It and I5 on each side.
The oscillating arms Iifi and H5 on each side
are, as above pointed out, pivotally mounted on
Serial No. 687,846 ñled August 2, 1946.
the pivots §23 and are connected, respectively, by
pivots Iii and §22 to the links H2 and |I3.
Consequently, the operation of the motor 53 will
In addition, and in order to facilitate the eXtra
lift or rise given in the front end of the screen
frame |33, the front end of the screen is counter
balanced by the weight ilu comprising a cross
bar connected by chains Ill and I’IZ passing over
the sprockets I ‘i3 and IM and secured to the
through the gear train above pointed out cause
the crank discs [email protected] and I II to rotate and will
through the connecting links M2 and Iiîi cause
the oscillating- arms iid and H5 to move back
and forth in order to raise and lower the screen
carriage |33 in the manner described below.
front end of the screen frame i 30.
The upper end of each of the oscillating arms
I I4 and IIE is bifurcated at I3§ to surround and
engage the longitudinally oscillating bars |32, |32
on each side,
Adjustable collars §33, i3d are pro- ‘
vided on each of the oscillating bars |32 in order
to provide an abutment against the side of the
bifLu-catingr extension §35 of the arms I ill and I I5
to push the oscillating bars |32 back and forth.
Each of the oscillating bars |32 is supported at
opposite ends by the chain |35 which passes
around the front sprockets £35, |31" -and the rear
sprockets |33, I 3S. As the oscillating arms Iii!
and I I5 oscillate back and forth, they alternately
bear against the collars L33 on the oscillating bars
|32 and the collars |34 thereon, thus causing the
bars §32 to move back and forth.
This, therefore, causes the chain |35 on each
side to move back and forth and hence rotates
the sprockets IE6-«itl and ISB-|33 back and ,
Sprockets I 36 and |37 are connected by the
shaft ille mounted in appropriate bearings in legs
II] and I3. Sprockets |33 and |39 rotate on shaft
|32 mounted in appropriate bearings through legs
II and |2-the shafts |35 and Ill-2 rotating with
their sprockets.
Each end of the shaft for sprockets I 33 and
I3`| is provided with a relatively short crank |45,
|45 thereto.
Each of the cranks |45 is connected at pivot
|50 to the longer link |5I. Each of the links I5I
is connected by an appropriate pivot |52 to 'the
push bar I 53 on each side attached in any appro
priate manner to the underside of the front end
of the screen frame |33. Push bar i 53 rides in a
suitable vertical bearing [email protected] secured on each side
to the leg members I3 and I3.’
It will thus be seen that rotation of sprockets
I3‘I and |33 will cause the road |33 on each side
The sprockets |73 and I'M are mounted on the
cross shaft |'I5 carried between the vertical posts
|75 and ITI at the front or delivery end of the
machine. It will thus be obvious that as the oscil
lating arms ||4 and IE5 are moved back and
forth by the motor GQ working through the gear
train 88, 3Q, 95, and |39 to drive the sprockets
|62 and |33 which in turn drive the crank discs
IIiì and III, the oscillating bars |32 are moved
longitudinally back and forth.
, When the oscillating bars I I3 and H5 are
moved toward the back of the machine, as shown
in Figure 1, then the sprockets §35 and |33 are
rotated to the position shown in Figure l where
the links IBI and I5| are pulled down to pull
down the screen table.
The position of Figure l is that which the maI
chine reaches just after the screen frame |35 has
been pulled down with the inking carriage, here
inafter to be described, just beginning to move
over the screen frame from one end or" the frame
to the other.
The oscillating arm IIII is shown commencing
its return oscillation toward the left with respect
to Figure 1, which oscillation will be completed
just after the inking carriage has reached the
right-hand side or delivery end of the machine
with respect to Figure 1.
At this time, the end ISI of oscillating arm I I4
(as well as of oscillating arm H5) will strike the
collar |34 and release a latching element here
inafter described to release the paper stop and
clamping units, also hereinafter to be described.
At the same time, the movement of bifurcated
end |3| of oscillating arms H3 and H5 against
the collars |34 will move the oscillating bars I 32 to
the left with respect to Figure 1, thus rotating
sprockets I 36 and I 38 in a counterclockwise dl~
rection to a position where the links |45 and |5|
at the front and §33 and I 5I at the rear will
be extended in a substantially straight line to
cause the screen frame |30 to rise from the posi
tion of Figure 1 to the position of Figure 2.
In Figure 2, on the opposite side of the machine,
the completion of this rising operation for the
Shaft 2 I 0 is driven from shaft |9| as hereinafter
Shaft |9| is continuously driven by sprocket
|90, chain 2 I | and sprocket 2|2 on shaft 98 (Fig
ures 5 and 6). The shaft |9| is provided on its
screen frame |30 has been shown. At this time,
left side with respect to the feed end of the ma
the stencilled sheet is fed out of the machine at
chine (at the top of Figure 6) with a bevel gear
the delivery end, which is the left side of Figure
|93 which may mesh with the bevel gear |04 on
2, and the right side of Figure 1, and a sheet to
the longitudinally movable shaft |95 which is
be stencilled is fed in at the left side of Figure 1
10 rotatably mounted in and longitudinally movable
or the right side of Figure 2.
with respect to the bracket |96.
The screen frame |30 is up long enough for this
The delivery end of the longitudinally movable
delivery and feeding operation to be completed,
shaft |95 is provided with a clutch engaging ele
while the bifurcated end I3| of oscillating arm
ment |98 which may engage with the opposite
| |5 moves toward the collar |33. Oscillating arm
15 clutch engaging element |99 of the clutch 200
I I4, of course, moves simultaneously with arm I |5.
mounted on the end of shaft 20 I, which in turn is
When the oscillating arm ||5 now strikes the
rotatably mounted in bracket 202.
collar |33, it moves the oscillating bar |32 to
Shaft 20| carries at its delivery end the bevel
the left with respect to Figure 2 rotating the
gear 203 which meshes with bevel gear 204 on
sprockets |39 and |31 (and their corresponding 20 shaft 205 mounted in appropriate bearings across
sprockets |38 and |36) in an opposite direction
the intermediate frame members 25.
to cause the screen frame |30 to move from the
Shaft 205 is provided with gear 206 which
position of Figure 2 down once more back to the
meshes with gear 201 on shaft 208 which in turn
position of Figure 1.
is also mounted in suitable bearings across the
At this time, the inking carriage which has 25 intermediate frame members 25. The shaft 208
moved to the opposite side of the mechanism is
is connected by the sprocket 2|0 and chain |01
now operated to move back to the initial side of
to sprocket |88 on shaft |80.
the mechanism during the return stroke of the
Thus, the belts |80 are driven by the driving
oscillating arms | |4 and I I5 to the position where
pulleys |82 on shaft |84 only when the bevel gear
they will once more raise the screen frame.
30 |94 on the clutch shaft |95 is in engagement
Thus, it will be clear that the screen frame is
with the bevel gear |03 on shaft I9! which car
caused to rise at the completion of the movement
ries the sprocket |90, which in turn drives the
of the oscillating arms ||4 toward the front or
shaft |84 of belts |80.
When the bevel gear |04 is disengaged from
feed end of the mechanism and is caused to be
lowered at the completion of the movement of 35 bevel gear |93, then there is no drive to the belts
the oscillating arms ||4 and ||5 toward the de
|80 since this drive is broken at the said bevel
gears. Thus, when it is necessary to drive the
livery or rear end of the mechanism.
belts |80, the drive from sprocket 2|2, Figure 5,
The screen frame remains down while the os
in the bottom frame portion of the machine must
cillating arms ||4 and ||5 move from the de
livery to the feed end of the mechanism and the 40 be complete through chain 2I| to sprocket |90
on shaft |9|, then through bevel gears |94 and
screen frame remains up while the oscillating
|93, to the shaft 20|, then through the clutch 200
arms ||4 and II5 move from the feed to the de
to bevel gears 203 and 204 to gears 206 and 201
livery end of the mechanism.
to drive shaft 208 and sprocket 2|0 and then by
The inking carriage, hereinafter to be de
chain |81 and sprocket |83 to drive the belt drive
scribed, moves in one direction during the down
shaft |84.
cycle of the screen frame |30, then remains at
The feed mechanism which includes the feed
the end of its stroke during the up cycle of the
in roller 46 which cooperates with the feed slat
screen frame and then moves back in the opposite
45 also controls the energization or de~energizadirection during the next down cycle of the screen
tion of belts |80 through the bevel gears |94 and
frame |30.
|93 and the clutch 200.
Thus, the oscillating arms go through a com
The feed-in roller 46 is mounted across the
plete back and forth cycle for each rising and
arms 220, the lower ends of which are pivotally
lowering of the frame, while the inking carriage
mounted on the cross shaft 22| which is held
goes through one-half of a cycle for each rising
in any appropriate manner as, for instance, by
and lowering of the frame.
the brackets 222 on the front legs I0 and I3
When the screen frame |30 rises, it is necessary
of the machine.
to feed in a paper blank on which a stencil is to
The shaft |40 which carries the front sprockets
be printed and, at the same time, deliver or feed
|36 and |31 which in turn serve to raise and
out the paper on which a stencil has already
been printed. For this purpose, a plurality of 60 lower the screen frame |30 also carries just in
side the leg I3 the spur gear 225 which
belts |80 are provided registering with grooves
|8| in the surface of the table 20 (Figures 3, 11,
meshes with the gear 226 on the cross bar or
shaft 22| on which the arms 220 operate.
and 12).
Gear 226 has a link 228 eccentrically secured
The belts |80 pass over the driving pulleys |32
mounted on driven shaft |84 at the front end of 65 thereto at the pin 229. The opposite end of
link 228 is connected by shaft 230 to links 23|
the mechanism, pass diagonally across the table
registering with the grooves IBI, and then pass
and 232 (see particularly Figures l, 2, and 9).
Link 23| is connected between the outer end of
link 228 being connected to link 228 as above
The shaft |84 for the driving pulleys |02 of the 70 pointed out by shaft 230 and the shaft 234 on
arm 220.
belts |80 are driven by chain |81 which engages
Link 232 is connected between shaft 230 and
the sprocket |88 on shaft |84 and which chain is
the cross bar 236 mounted in appropriate
driven by the sprocket 2|0 on shaft 208 (Figure
brackets on the frame 30. The mechanism is
.6) mounted in appropriate bearings across the
over the idler pulleys |85 on shaft |86 at the rear
or delivery end of the mechanism.
intermediate longitudinal frame members 25.
so arranged, therefore, that when the sprockets
|35and |32 are operated from the positionl‘of
Figure l to the position of Figure 2 to raise the
screen frame |32, as shown in Figure 2, the gear
226 is rotated to pull the link 228 toward the
left with respect to Figures 9 and 2 and thus
drive the link 23| toward the'left, which in turn
end of the machine by a universal joint 252 to
the push bar Zäi, which in turn »passes through
an appropriate opening in the cross bar or shaft
234 between the feed-in roller carrying arms 22€).
> A suitable collar 253 is secured to the push
bar 253 on the rear of the cross bar shaft 234,
will result in driving the arm 22d to the left.
and a suitable adjustable nut 252 with an ape
The link mechanism .228-23l-222 and the
lock nut 255 are secured on the ’front
gears225 and225 are repeated on the opposite
side of the machine so that both arras 22e are 10 threaded end 255 of. the .push bar 25M. lWhen
the arms 22e carrying the roller et are operated
driven on both sides of the machine. Thus, the
the feed-in position, the cross bar 231i moves
arms 22S, as above pointed out, are driven in
up with respect to Figure 10 toward the rear end
toward the slat d5 when the screen frame is
of the machine, pushing the push bar 25! and
the longitudinally slidable bar |95 to the right
The pulleys |82 which drive the belts ige pro 15 with
respect to Figure 6.
ject upwardly throughv notches 22E! in the cross
slat 45 so that the belts |22 at the feed end of
the mechanism are above the level of the cross
This causes the bevel gears [email protected] and |23 to en
gage and alsoengages the clutch elements |98
and §99 so that the drive to shaft ISI previously
slat` 45.
described-is completed. This effects a drive to
Consequently, ’when the arms 22!) are driven 20 the belts iêdthrough sprockets |52 and |83 and
in toward the pulleys |32, the roller ed engages
the belts |82 on the pulleys |82. The roller 25
is a heavy friction surface roller supported by
the pins 46u in the notches- 225e at the top of
the arms 222. Consequently no accurate ad
justments arerequired, but the roller d6 may
ride up slightly on the portion of belts |32 lover
pulleys |82 when the arm 225 is driven in, thus
ensuring an' appropriate pressure engagement
between the roller 25 and the feed end of belts
laß and permitting the roller d5 to yield up
wardly slightly in order to ensure such pressure
and to prevent buckling or breakage of any of
the elements.
Thus, when the lscreen frame |35 is raised as
shown in Figure 2, a sheet t! which has been.
placed on the slat 45 against the feed end of the
belts i863 will be pressed by the roller 4S in the
manner above described against the feed end of
belts E82 so that the belts
draw the sheet
chain i5?, all as'above described.
Thus, the belts [email protected] are operated to move across
the tabl-e 2E only when the feed-in cross arms 220
and their roller ‘te are in the feed-in po1ition;
but since the cross arms 220 are in the feed-in po-V
sition only when the screen frame iii-ii is raised,
then the belts [email protected] are caused to move across the
face of the table 2i! only when the screen frame
§30 is raised.
When the screen frame E3!) is dropped, then, as
above pointed out, the roller carrying arms 220
are moved outwardly and this, through the nut
252, pulls out the push bar 25E and the longi
tudinally slidable shaft |95 to disengage the bevel
gears |94 and |533 and to disengage the elements
E98 and |99 of the clutch 222.
Thus, when the screen frame is lowered, the
belts |82 are halted. AS above pointed out, the
belts mi? ride in »grooves ißt in the table 25. The
grooves ISI are of sufficient depth so that the belts
E82 may rest therein at least flush with the sur
li! in. „
In actual operation, when the screen frame
face of -table 2G. It thus becomes necessary to
|35 is down in the position of Figure l, the arms
raise the belts i213 out of the grooves |`S| above
220 have moved back to a position where the
the level of the table 22 when it is desired to op
roller 46 just clears the feed-in slat 25. The 45 erate the belts §20.
belts |89 are not operating at this time as will
250 is
shortly be pointedout.
The operator feeds a sheet> of paper
provided, the said roller being appropriately
l on
notched at 278i , 25| .to guide and control the belts
which a stencil is to be made onto the feed-in
slat45 and under the roller 45 up to the portion
of belts its on the drive pulleys L32. When the
screen frame E32 is raised to the position of Fig
ure 2, then this operation simultaneously moves
|32 which pass thereover as shown in Figures 3,
13,14, 11 and 12.
The roller 25S is driven from the motor Si) (Fig
ure 5) through pulley 2|, belt t2, puller;7 83, shaft
84, gear 82, gear 89, shaft 9i? which carries the
sprocket 21|). Sprocket 270 is connected by chain
in the arms 22|] and simultaneously causes the
belts |85 to move.
55 2li to sprocket 272 on cross shaft [email protected] which is
, Thus, the roller £5 is moved in, as above
mounted in appropriate bearings 2M, 272 across
the base frame members l5 and it.
paper against the belts and thus permit the belts
Pulley 276 on shaft 2l`3 is connected by belt 2T!
to draw the paper on to the table 2i).
to the pulley 2718 on the cross shaft 2ï9 carried
When the screen frame |32 moves down once 60 between the intermediate longitudinal frame
more, the roller 45 moves back again so that
members 25. Sprocket 285 on shaft 279 drives the
all elements are in the position of Figure 1 and
chain 28| which drives sprocket 282 on shaft 283.
the operator may once more place a sheet lll
Sprocket 284 on shaft 223 drives the chain 285
in proper position to be engaged torbe fed in on
which drives the sprocket 285 on shaft 2.3i of the
the next screen lifting operation.
pointed out, to push the leading edge of the
feed~out roller 222.
The movement of arms 222 which carry the
The feed-out roller 260 is mounted in appropri
roller 22 into the feed-in position also serves to
bearings in the vertical standards 290, 290 on
engage bevel gears itl-t and |93 and clutch 22S
the cross bar 22| which is mounted just beneath
to, drive the >belts E52. The drive for the belts
|85 through the clutch 222 and bevel >gears E23 70 the table frame i9. Cross bar 2st is mounted
on the vertical rods 225 which pass through ap
and 'me has already been described.
openings in brackets 29S, 2M’ secured
It was pointed out above that bevel gear i522
beneath the table frame i9.
and clutch element ist are mounted on the
The said rods 295 are secured to the bracket in
longitudinally . movable shaft §95. Longitudi- ‘
suitable manner as,> for instance, by ar'
nally movable'shaft |55 is connected at the feed 75 ranging
the rods 295 so that the lower half sec
tion thereof is threaded and by passing the rods
295 through appropriate openings in the cross bar
29| and securing them thereto by appropriate
nuts 299.
A compression spring 399 on each side is cap
tured between an appropriate washer 39| beneath
the nuts 299 and the lower horizontal surface of
brackets 291. The compressing of spring 399 is
determined by the adjustable nut 393 and lock nut
during both the down and up position but is, of
course, effective only in the up position of Fig
ures 12 and 14. The driving connections through
the Various chains and sprockets are sufficiently
iiexible to permit the roller 269 to be raised and
It will be obvious that, as pointed out in my
prior yapplication Serial No. 687,846, the angle
which the belts |99 make to the side of the ap
paratus will notonly feed the sheet longitudinally
399. The springs 399 tend to drive the rods 295
on to the table 29 but will also carry the sheet
up as shown in Figure 14 to a position where the
over to the left against an appropriate paper
upper side of roller 269 is above the upper surface
clamp or stop 359 (Figures 6, and 22 to 29) which
of table 29.
extends along the left side of the table 29 look
The roller 269 is rotatably mounted as will be
at the table from the feed end.
obvious from an inspection of Figures 3, 13, and 15 ingThe
paper clamp 359 comprises a stop element
14 in the slot 3I9 in table 29. When the roller
35| and a clamping element 352. When the
269 is in the position of Figure 14 above the upper
clamp 359 is up in the position of Figures 27 and
surface of table 20, then the notches 26| in the
29, then only the stop element 35| comes into play
roller 269 lift the belts 299 from the position of
the paper sheet is moved over by the belts
Figure 11 to the position of Figure 12, lifting the
|89 against the side stop 35 I.
belts from a position Where they are flush with
When the paper clamp 350 is down, the clamp
the surface of the table 29 to a ‘position where
ing element 352 moves to the position of Figures
they are above the surface of the table 29 and
26 and 28 and clamps a sheet on the table be
thus may feed a sheet of paper longitudinally
25 tween the clamping element 352 and the table 29,
across the table 2 9.
thereby holding the sheet firmly on the table.
At the same time, whenl the upper surface of
In addition, it is necessary to provide a back
roller 269 has been raised above the upper sur
stop 355 (Figures 3, 7, 26 and 27). Back stop
face of table 29, a sheet of paper which has been
moved out partly by the belts |89 will ride on the 30 355 moves up and down in the slot 356 in table 29.
Back stop 355 is in the up position when the
upper surface of the roller 269 which will feed
screen frame |39 is raised as is also the clamp
the sheet of paper out to appropriate delivery
359 and is in the down position when the screen
frame |39 is lowered,
Any appropriate delivery mechanism may be
However, the mechanism must be so adjusted
used and the said delivery mechanism which may 35
that back stop 355 will not rise immediately upon
consist of a delivery belt or belts may be driven
the rising of the screen frame |39 since it is first
by the belt 3I2, Figure 5, on pulley 3|3 which is
necessary to cause the printed sheet to move over
driven by the shaft 213.
the back stop on to the feed-out roller.
When the roller 269 is lowered to the position
of Figures 13 and 11, then the belts |89 drop _
down into the notches |8| and at the same time,
as pointed out below, the roller 269 drops down
to a position where it does not interfere with any
thing on the table.
The position of the roller 269 is automatically
controlled by the position of the screen frame
|39 which moves down into engagement with the
table frame I9 as shown in Figure 13 to operate
the roller 269 from the up position of Figure 14
to the down position of Figure 13.
When the screen frame |39 is down, it pushes
down the rods 295 thus pushing down the cross
bar 29| and thereby pushing down the roller 269
to a position below the top surface of the table
29 wherein both the roller 269 and the belts |89
are flush with or below the level of the table, as
shown in Figure 11.
When the screen frame |39 rises, then the com
pression springs 399 move up the bracket 29|
and accordingly move up the roller 269 to a feed
The paper stop is mounted on the cross bar
369 which passes beneath the side frame mem
bers I8 and I9 in front of the cross bar 29|. Cross
bar 369 is provided at its outer end with the rods
36|, 36| on each side which project upwardly
through appropriate openings in the table frame
pieces I8 and I9.
Compressing spring 363 between the cross bar
369 and the dependent bracket 364 biases the
cross bar 369 upwardly, said compression spring
being centered by the rods 36 I.
Thus, the cross bar 369 is biased upwardly,
thereby biasing the stop member 355 upwardly
to extend through the slot 356 above the level of
the table. The stop member 355 is provided with
the notch 319 through which the side belt |99
may pass so that the stop 355 does not interfere
with the operation of the belt «while it is up and s0
that the stop 355 may project upwardly sum
ciently on both sides of the belt to serve as a
back stop for the paper.
It will be seen from a comparison of Figures
out position while, at the same time, moving up
and 27 that when the screen frame |39 is up,
the belts |99 to a position where they will move
the springs 363 on each side urge the cross bar
a sheet across the surface of table 29. Thus, it
369 up to raise the back stop 355 and the paper
will be seen that in addition to a feed-in mecha.
clamp 359. When the screen frame |39 is down
nism controlled by the raising and lowering of
pushing down the rods 36|, then the cross bar
the frame, the movement, both the starting and
369 is down and the stop 359 is below the level
stopping, of the belts is controlled by the raising
of the table and the clamp 359 is down in
and lowering of the vframe through the clutch
clamping position.
mechanism which in turn is controlled by the
The cross bar 369 is connected on one side by
feed-in mechanism and at the same time the 70
paper clamp 359 to the front latching bar
height of the belts above the table and the p0
389 which is also provided with a rod 38| ex
sition of the feed-out roller for cooperation with
tending up through the side frame member I8
a sheet is also controlled by the position of the
and spring biased upwardly.
screen frame with respect to the table.
The feed-out roller 269 is continuously rotated 75 Thus, the front end of the clamp element 359
is> also biased ,upwardly Clamp 350 is so _ar
ranged that its clamping element 352 extends
yfrom >adjacent the front end of the table up to a
point adjacent the rear end of the table as shown
in Figures 3 and 7 but does not extend clear up
to the stop 355.
Thus, if the front end of the clamp element 352
is released first, it will pivot upwardly at the rear
and on bar 332 being sufficiently ñexible to do
this, and it will thus rise sufficiently to release the
clamping pressure on the paper sheet. The paper
sheet will then be fed over the stop 355 on to the
roller 2‘60 by the belts |80.
At this time, the stop 355 will rise but since a
portion of the paper has already passed the stop
355 and is resting on the roller 260, the paper
will be fed out.
Accordingly, the screen frame |30, while it
presses down the rods 36| at the rear end and the
rod 38| at the front end to engage the clamp and
move the stop below the level of the table 20, does
not directly cause the stop or the clamp to rise
when it rises. This occurs because of the latch
elements 430, 40| which engage the'edge of the
cross bar 360 'in the lowered position of the
screen frame as shown in Figures 1, 7, and 27 ,
the front end of clamp 350 to be raised thereby
clearing the clamp from its engagement with the
paper on the bed of the machine.
Since the belts |80 have been energized, the
5 ` paper is moved over the paper stop 355 on to the
roller 250. As seen in Figure 3, this requires only
a very short movement.
With the paper now on the roller 260, the con
tinuance of rotation of the latches releases latches
400 and 40| from the paper stop bar 360 permit
ting the paper stop to snap up in position to fur
nish an appropriate stop for the next sheet of
paper to be fed into the machine. The timing is
thus obtained by the length of the latches and
' by the difference in depth of the detents.
All of the latches are spring biased toward
latching position by the tension spring 440 which
biases the bell crank lever 42| in a counterclock
wise direction with respect to Figure 1. The top
edges of all of the latches are chamfered to per
mit them to move to be engaged when the screen
frame is lowered.
By this means, therefore, a simplified method
is obtained for clamping the paper sheet and at
the same time removing the paper stop from a
point where it may interfere with the operation
and because of the latch element 402 which en
of the screen frame.
gages the front cross bar 380 for the clamp 350.
'.Í‘he same apparatus provides a simplified se
The latch elements 400 and 40| are keyed to
quential means for ñrst .releasing the- paper
the shaft 4|@ carried between the intermediate 30 clamp to permit the paper to move the fraction
frame members 25 so that they operate simul
taneously. When the cross bar 360 Ais _pushed
down by the action previously described, the edge
of cross bar 360 engages the detent in latches 400
and 40 I,
At the same time, the edge of cross bar 380 is
engaged by the detent of latch 402. This moves
the stop 3555 down and engages the clamping ele
ment 352 of clamp 350 against the table 20 in the
position of Figures 26 and 28.
When the screen frame |30 rises, the paper stop
355 and the clamp 350 are nevertheless held down
b'y the latches 400 and 40| at the back end of the
paper stop and latch 402 at the front end for the
of an inch necessary for it to clear the paper stop
and then releasing the paper stop. Even if the
paper has not yet reached the roller 260 when
the paper stop 355 snaps up, the fact that
the leading edge of the paper is over the paper
stop and the fact that the belts I 80 are operating
are sufficient to ensure that the paper will be
fed out.
The arrangement of the latches 400 and 402
to ensure that the front latch 402 .will release
ñrst is particularly shown in Figures 23 and 25.
In addition, it is necessary to obtain extreme
accuracy of registry of the paper on which a
stencil is to be made with the desired portion
of the table.
As the screen |30 continues to rise, the upper
I have found that at times the movement of
bifurcated end |3| of oscillating arm ||-4 which
the paper up to the side clamping stop element
is beginning to move against the collar |34 strikes
35| while it rmoves up against the back stop 355
the adjustable stop 420 on the bell crank lever 42|
provides more accurate registry but permitsno
which ispivoted at 422 on side frame element 25.
adjustment of the registry.
The upper end of the bell crank lever 42| is con
Accordingly, in Figures 22 to 25 and es
nected by pin 424 to the link 425, which in turn is
pecially in Figures 28 and 29, I have shown ad
connected by pin 425 to the lower end of latch ele
justing elements which permit adjustment of
ment 40|.
the registry. This includes adjusting lingers
This rotates the bell crank lever 42| clockwise
350, 450 keyed to the rotatable bar 45| in bear
with respect to Figure l and thus through the
ings 452, 452 on the supporting bracket 453 of
the clamp.
link 4.25 rotates the latch element 40| counter
clockwise with respect to Figure 1 to release the
A lever 400 is keyed to the shaft 45|; a ten
back stop 355.
60 sion spring 462 is secured at its upper end to
The raising of the screen |30 now operates the
the lever 430 and is secured at its lower end to
any suitable portion of the frame and thus biases
arms 220 to feed in a blank and start the belts
lever 430 downwardly biasing the finger 450 out~
|80; the roller 260 also rises up because it is not
held by a latch.
wardly away from the clamp 350.
The side 35| of clamp 350 is provided with
The upper end ‘of latch element 400 is con 65
slots 65 through which the ends of the fingers
nected at 430 to the link 43| which in turn is
45.0 may project as shown in Figures 28 and 29.
connected at 432 to the latch element 402 so that
The outer end of lever 430 rests on the adjusting
the latch 402 is also tripped.
screw 410 threaded into bracket 41| supported by
The latch 402 is provided with a relatively shal
the side frame I8.
low detent and is relatively shorter so that it is
When the screen |30 is up and hence raising
rotated more rapidly out of latching engagement
the clamp 350, vthe spring 462 pulling down on
than the latches 400 and 40 I.
lever 450 pulls the linger 450 out as> shown in
Thus, when the latches are tripped by opera
Figure 29. When the clamp 350 is lowered so
tion of bell crank lever 42| by oscillating arm I |4,
that its supporting bracket 403 carries down the
the front latch 402 releases ñrst. This perm-itsV ' ‘shaft
45 I ,
then lever 460v is rotated'upwardly
since screw ¿510 is stationary and fingers 450 are
pushed in as shown in Figure 28.
The degree by which fingers 450 are pushed
in on rotation of shaft 45| is controlled by the
adjustment of screw 4'l0. Thus, with the screen
frame |30 up, the paper is fed in on to the table
and moved against the back stop S55 and the
side clamp 350. On completion of this move
ment and as the screen frame |30 descends, it
pushes down both the back stop 355 and the
side clamp 350 as above pointed out.
This action, as shown in the figures, especially
Figures 28 and 29, moves the fingers 450 in the
slots 465 being provided in the clamp to permit
this action to occur.
The iingers 450 at each end thus push against
the edge of the paper and slowly push it to the
preset point of registryas determined by the
adjustment ofthe screw 410. Thus, for sheets
of paper which are required to be stencilled with ‘
slightly different margins, a simpliñed rapidly
made adjustment is provided, the said sheets
being pushed outwardly away from side stop 35|
of the clamp Yby the degree to which the fingers
450 enter the slots 465 of the clamp.
The screen frame |30 has the general con
struction. previously described in my prior ap
plication Serial No. 687,846 land is so arranged
as to removably support a silk screen.
Thus, as seen in Figure 8, it comprises essen
tially the pair of longitudinal I-beams |3041 and
|305 connected together in any suitable manner.
An inking carriage 500 comprises the outer side
plates 50i, 502 connected together by the cross
bars 503, 504 (see Figures 1, 2, 3, 20 and 21 as
well as Figure 8) .
squeegee 530 for various reasons, either- for the
purpose of raising or lowering the same or for
the purpose of compensating for any cant or tilt
thereof, then it is only necessary to turn the nuts
510 on each side and the adjustable plates 540
and 54| on each side will accordingly be raised
and lowered. This adjustment may be locked by
the locking bolt 585, the head of which bears
against the material of the intermediate side
plate 520 on each side of slot 550 and Which is
captured in the adjustable plates 540 and 54| by
the nut 586.
The shaft 550 is connected by gears 590 on shaft
550 and gear 59| on shaft 532 to the shaft 532.
The shaft 550 extends out on the left side of the
machine with respect to Figure 8 to the tilting
bar 600.
Tilting bar B00 is so arranged that it may be
rotated back and forth to rotate shaft 550 back
and forth and thus to rotate the shaft 532 back
and forth to move the squeegee 530 back and
forth. The operation of the tilting bar 600 is
demonstrated in Figure 2.
When the inking carriage 500 has reached the
front end of the machine by means of the appa
ratus hereinafter described, the printing frame
|30 rises. At this time, the squeegee 530 has been
in a trailing position and the tilting bar 600 was
in an angular position displaced counterclock
wise, which is approximately 45° from the posi
tion shown in Figure 2.
As the screen frame |30 now rises lifting up the
carriage 500, the end 60| of the tilting bar strikes
the pin 602 carried by the vertical bar 603 secured
by an appropriate bar 004 and bracket 605 to the
front side frame I8. This turns the tilting bar
600 in a clockwise direction approximately 45° to
the position shown in Figure 2 and, consequently,
shifts the squeegee 530 from its original trailing
>Each of the side frame members |[email protected] and
|3019 of the screen frame is provided with an
upper and lower rail 505, 500, respectively, to
receive the rollers 500, 509, respectively, on each 40 position to a new trailing position as shown in
Figure 19, which new trailing position corre
side of the carriage.
sponds to the next intended movement of the
For rigidity, there is a pair of upper rollers
inking carriage 500 back toward the delivery end
508 on each side and a pair of lower rollers 509
of the machine.
on each side. The inking carriage 500 may thus
When the delivery end of the machine is
roll along the upper portion of the screen frame
|30 from one end to the other as shown by a
comparison of Figures 1 and 2.
The intermediate side plates 520 and 52| on
each side are supported by the cross bars 503
and 504 which pass therethrough and are se
cured thereto.
The squeegee or ink spreader 555 is removably
secured to the legs 55|, 53| which are keyed
to the shaft 532 which is journalled in appro
priate bearings in the adjustable plates 540 and
54| slidablyA mounted inside the intermediate
side plates 520 and 52|. Shaft 550 is also jour
nalled in the adjustable plates 540 and 50| but
passes through the said plates and through the
reached by the inking carriage 5,00, the tilting
bar 600 is in the position shown in Figure 2, but
the carriage 500, of course, is at the delivery end
of the machine.
Now, when the printing frame |30 is again
raised, the end 60| of the tilt bar 500 moves under
the pin 0H carried by the vertical bar SI2 sup
ported by bracket 6|3 from the rear side frame
I8. This will rotate the tilting bar 600 counter
clockwise once more about 45° and shift the
squeegee 530 to the new trailing position with
respect to the next movement of the carriage
toward the front or feed end of the mechanism.
Accordingly, the squeege-e is shifted from one
trailing position to the other as the printing
intermediate side plates 520 and 52|, passing
frame is raised. When the squeegee reaches the
through the adjusting slot 500 in the interme
end Aof its stroke, it is in the trailing position for
diate side plates 520 and 52|.
that stroke but must be shifted to the trailing
The adjustable plates 550 and 54| are con
position for the next return stroke.
nected, respectively', to the intermediate side
At the same time, this shift must be in such
plates 520 and 52| by thD adjusting nut
on 65
a manner as not to dislocate the ink supply. By
each side which engages the adjusting screw
this means, therefore, the shift of the squeegee
51| on each side, which screw is in turn rigidly
to the proper trailing position occurs when the
secured to the bracket 513 of the adjustable plates
inking carriage 500 has been raised up by the
540 and 50 I, respectively.
The nut 510 bears on the upper surface of 70 elevation of the printing carriage.
The upper ends of the side intermediate frame
bracket 580 secured to the top of the intermediate
520 and 52| are interconnected by the
side plates 520 and 52| on each side, the screw
51| passing through an appropriate opening in
cross bars 620 and 52 l. These cross bars 620 and
62| project at 625 beyond the intermediate side
When it is desired to adjust the position of the 75 plate 52|.
the said bracket.
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