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Патент USA US2405168

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Aug- 6, 1946-
R. G. scHuLER
2,405,168
PROJECTOR FOR ÍÍ’AC'YE- PRINTERS
Filed'July 17, 1940,
4 Sheets-Sheet 2
Aug. 6, 194e»
R, G, SCHULER
29495168
PROJECTOR FOR PAGE PRINTERS
Filed July 17. 1940
4 Sheets-Sheet 3
FIG. 5
[26
28
mvElyToR
REGINALD G. scHuLER
ATTORNEY
Aug. 6, 1946.
R. G. scHULER
2,405,168
PROJECTOR FOR` PAGE PRINTERS
Filed July 17, 19510
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FIG. 8
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INVENTOR
REGINALD G. SCHULER
Patented Aug. 6, 1946
UNITED
2,405,168
STATES
PATENT OFFICE l
2,405,168
PROJECTOR FOR PAGE PRINTERS
Reginald G. Schuler, Highland Park, Ill., assignor
to Teletype Corporation, Chicago, Ill., a corpo
ration of Delaware
Application July 17, 1940, Serial No. 346,003
6 Claims.
(Cl. 88-24)
l
2
The present invention pertains to printing tel
egraph projection systems and apparatus and
more particularly to combination page printers
The foregoing and other objects and features
of the invention will appear from the following
detailed description taken in conjunction with
the accompanying drawings, in which,
and projectors for displaying on a screen or in
spection area information in enlarged characters.
The primary object of the invention is to pro
vide a page printer-projector wherein the image
appearing on the screen includes substantially
the last character recorded.
ACCOI'díIlg to the present invention a projection
Fig. 1 is a perspective view of the projection
cabinet with a part of the wall broken away to
show schematically the optical and projection
system;
Fig. 2 is 'a cross-sectional view of the printer
projector according to the present invention;
system has been provided which embodies a page
printer, of the type shown in U. S. Patent No.
1,904,164, designed to give upon a screen a run
Fig. 3 is a perspective View of a stereoptican
slide carrier;
Fig. 4 is a modiiied form of delivery means for
ning account of received message matter, through
the instrumentality of an optical system compris
the supply of record material;
Fig. 5 is an enlarged side View and partial sec
tion of the printer mechanism and associated
ing an arrangement of inclined mirrors so that
the printer and lamp housing may be located at
lamp housing and part of the optical arrange
the lower part of a suitable cabinet, and the
ment;
'
screen formed as a part of the upper forward,
Fig. 6 is a View of an alternate form of guiding
wall of the cabinet and positioned above the 20 means for the record material;
printer compartment,
Fig. 7 is a view of an alternate form of mount
Specifically, the page printer is mounted on
ing for the small reñector mirror of the projec
rails supported in a structural frame to which is
tion system;
pivotally mounted the lamp housing, in such
Fig. 8 is an enlarged cross-sectional view of the
manner that the lamp housing with its con N) Cil printer platen and platen frame;
densing lenses is positionable so as to embrace
Fig. 9 is a view taken substantially on line 9-9
within the field of projection the last line of
of Fig. 8;
printing, and also to include eight or ten printed
Fig. 10 is a top view of the part of the printer
lines. Printing is effected on a Cellophane strip
mechanism shown in Figs. 8 and 9; and
and the image of the record produced thereon is 30 Fig. ll is an enlarged side view of a type bar
projected through the optical system onto the
head.
screen. The Cellophane web or strip is drawn
Having reference to the drawings in which like
upwardly through the projection field. The
characters on the section of the web in the pro
jection field are so arranged as to form horizon
tal lines one above the other, and the images of
said horizontal lines of characters are projected
on the screen. The horizontal lines of images on
reference characters indicate similar parts
throughout the several views, the combination
35 page printing and projecting apparatus accord
ing to the present invention is housed in a cabi
net, indicated generally by the numeral II, which
is provided in the lower portion thereof with a
the screen move upwardly across the screen simi
door I2, and in the upper portion with a trans
lar to the movement of the web through the 40 lucent projector screen I3. Secured to the floor
projection field.
of cabinet I! are two angle iron rails I4 (only
The lamp housing together with the condensing
one of which vis shown in Fig. 1) which provide
lenses is swingable upwardly about its pivotal
a track for the frame i5 (Fig. 2) which supports
articulation with the structural frame to permit
ready access to the page printer, so that when
the lamp housing is raised, the printer is rendered
Ul
the page printing apparatus, indicated generally
by the numeral I6; the >lamp housing I'I, and the
optical arrangement represented generally by
`condensing lenses I8, small .mirrorl I9 and objec~
accessible for servicing.
Further features of the invention reside in pro
tive lens 2|. Wheels 22 are journaled to the bot
riding a disc platen movable with the type car
tom side members of the frame I5 and co-operate
riage wherein printing is effected on the periph 50 in rolling relation with rails i4, which are pro
ery of the disc and the number of hidden printed
vided with indentations 23 into which the wheels
characters is reduced to a minimum; and mea-ns
2.2 are admitted when the frame I5 in assuming
for assuring even wear of the platen by auto
its fully inserted position in the cabinet II, rests
matically rchanging its printing point, incom
upon spacing bosses 25. In the fully inserted po
mensurately.
sition, the frame I5 is anchored by means not
2,405,168
shown to the base of the cabinet II. With this
arrangement, the frame is easily insertable in the
cabinet II by means of rollers 22, and moreover
is adapted, when the proper position has been
assumed, to rest upon spacers 25 and then to be
anchored to the cabinet.
At each side of frame I5 and disposed at the
rear thereof are pivot supports 24 for a frame 25
which carries the lamp housing I1 and condenser
lenses I8.
A bar 20 (Fig. 6) is pivoted to frame «
26 and the lower end of said bar is provided with
a hook portion (not shown) which, when the
frame 26 is swung upwardly about pivots 24 tok
facilitate removal of the printer for servicing,
is held in its upward position by the engagement
of said hooked portion with a stud, in well-known
manner, the bar 29 thus serving as a brace or
support. The lamp housing I1 comprises »an
outer casing 21 (Fig. 2) which is secured to a
plate 28 fastened to a crossbar 29 of the frame 26.
Contained within the lamp housing I1 and suit
ably spaced from the outer casing 21 thereof is
a bañie plate 3| which rests upon the bottom of
the housing I1 and extends upwardly kto a point
close to the top as illustrated in Fig. 2. The
bottom of the housing I1 is provided, between the
outer casing 21 and the bafñe plate 3|, with aper
tures 32. This construction permits the flow of
convection currents between the outer casing 21
and the baffle plate 3| for cooling purposes. ;
Housing I1 is provided with a cover 33 having a
grilled section 34 covered by a meshing if desired.
Depending from the cover 33 and spaced there
from is a baffle plate 36 (Fig. 2) of substantially
the same area as the opening 34. 'I'.o protect the
condensing lenses I8 from the heat of lamp 31,
the bottom of the housing I1 may be cut away
as at 38. Lamp 31 is adjustably clamped te a
Mirror 5I is supported at three points to mini
mize, or even eliminate the possibility of injury to
the mirror due to a twisting action. Mirror 5I is
secured to the cabinet I I through the instrumen
tality of a bracket 58 located centrally of the
bottom edge of the mirror. At each of the upper
corners of mirror 5I is provideda bracket 59 by
means of which the mirror is secured to the roof
Of cabinet I i. Mirror 5| is in the form of a regu
-lar trapezoid, with the shorter of the parallel
sides positioned contiguous to bracket 58,
The
trapezoidal shape of the mirror 5| conforms to
the effective shape of the field of projection at the
.angle at which mirror 5I is placed in cabinet I i.
Mirror 5I, so shaped, produces a rectangular
visual field or field of projection on screen I3,
which accordingly is of rectangular conforma
tion.
The projection screen I9 is composed of trans
lucent material so as to permit an image to be
projected on to it from the rear and be visible
from the front of the screen.
-
A blower or exhaust fan 14 (Fig, 1) is located
at the upper part of the cabinet II and is posi
tioned behind the mirror 5|.
Blower 14 is so
mounted that its exhaust port projects through
an aperture 16 in cabinet I I, and is suitably sup
ported in said cabinet.
Having reference to Fig. 2 a page printer of
the type shown in U. S, Patent 1,904,164 is mount
ed in the frame I5. The printer indicated gen
erally as I6 has been mcdiñed in certain respects
to adapt it for use with the projector of the pres
ent invention. The‘page printer comprises the
side frames 19 and 'i9 (Fig. 5) to which is piv
oted at 8| a platen frame indicated generally as
82. The usual cylindrical form of platen has been
dispensed with in the present embodiment of the
invention and has been substituted by the disc
bracket 39, which in turn is adjustably supported
form of platen |13 shown in Figs. 8, 9, and 10 and
by the floor of the housing |1_ A reilector 4| is 40 which will be hereinafter described.
spring clamped by a carrier 42 which is adjustably
To provide a running account of the message
supported, through the instrumentality of a rod
printed on the page material a delivery mecha
43 and the enlarged mounting holes for plates 45,
nism is provided which comprises a means for
by the outer casing 21 of the lamp housing I1.
permitting the record material to escape from the
In the embodiment of the invention shown in
supply roll, suitable guides, and a web pulling
the drawings, a condensing lens system I8, com
means whereby the page material is advanced
prising two plano-convex lenses and one convexo
through the printing Zone. The page material
convex lens, is provided, these lenses being suit
49 in being withdrawn from the roll 83 is directed
ably clamped by clamps 44 to plates 28, 46 and 41 .l , over a slack bar 84 which is pivoted at 95 and is
which are appropriately separated by spacing
normally biased clockwise by a, spring 89 to main
posts (not shown). Plate 41 is secured along its
tain the page material or Cellophane web taut
top edge to a crossbar 48 (Fig. 2) of frame 26.
between the roll 89 and a hanged cylindrical
Plates 28, 46 and 41 are suitably apertured to p-ro
guide 81 carried on a shaft 99 journaled in plates
vide a ñeld of projection of such area as to pre
89 depending from side frames 18 and 19. The
sent upon the screen I3 (Fig. 1) a predetermined
'web 49 is then directed over a roller 9i to which
number of lines of printing produced- on the rec
is fixed a ratchet wheel 92, the ratchet wheel and
ord strip or web 49 of transparent material.
roller being carried on a shaft 93 journaled in
IAs previously mentioned, the optical system of
the plates 89 secured to side frames 18 and 19.
the present invention includes a mirror I9 and
Cooperating with the roller 9| is a pressure roiier
an objective lens 2|. The optical system also in 60 94 which is carried on a standard 99 secured to
cludes a mirror 5| (Fig. 1) supported in the
a rock shaft 91.. Pressure roller 94 is drawn into
upper part of the cabinet II, and through this
pressing relation with roller 9| by means of a
system the image is projected upon the screen
spring 98. Secured to rock shaft 91 and located
I3, The mirror I9 is adjustably pivoted on a pair
in juxtaposition to plate 89 is a pressure roller
of standards 52 by means of which its angular
release lever 99. Cooperating with lever 99 is a
position may be determined.l Moreover, stand
shoulder IGI on plate 89 arranged so that when
ards 52 are adjustably mounted on brackets 53
lever 99 is actuated counterclockwise (as viewed
secured to frame I5. The objective lens 2| is
in. Fig. 5) against the action of spring 98 it will
adapted to be adjustably clamped by a clamping
latch up behind or on the left-hand side of the
band 54 which is supported on a U-shaped
shoulder IDI thereby releasing the pressure roll
bracket 56, .which in turn is secured to a crossbar
er 94 from engagement with pressure roller 9|
51 on frame I5, Thus, the adjustable mountings
and maintaining this condition, until lever 99 is
provided for the mirror I9 and the objective lens
again released from the shoulder |9I to permit
2| facilitate the proper positionment of the image
on the screen.
o spring 98 to bring roller 94 again into pressing
2,405,168
5
6
relation with roller 9|. Associated with the
ratchet Wheel >492 is a pawl member |02 (Fig. 2)
(as yshown in said patent) a set >of curved code
vbars |4| (Fig. 5). Code bars |4| and said bell
cranks are supported Yon a movable type carriage,
which is‘pivoted 'to a bell crank lever |03 car
ried on a pivot shaft |04. The depending arm of
bell crank |03 is pivoted to one end of a push
rod |06, the other end of which is shouldered
to cooperate with a function bail |08 in the man
indicated generally by thve numeral | 42, which
is provided with rollers '|43 and |44 whereby it
is adapted to travel on tracks >|45Aand |46, re
spectively, positioned between side frames 18 and
i9. Cooperating with code bars í‘êí are a plu
ner shown in the aforementioned patent 1,904,164.
Thus, in response to a predetermined selection, a
function lever, similar to function lever |01 shown
in Fig. 5, is selected to raise the free end of push
bar |06 upwardly into the path of the function
bail blade |08. Then, when the push rod |05
is actuated leftwardly by the function bail |00,
clockwise rotation is imparted to bell crank lever
rality of pull bars |41 having individuall springs
|48. Pull bars |41 are operatively connected by
rack and pinion connections to a corresponding
plurality of type bars |49 pivoted on a shaft |'5|.
Type carriage |42 is also provided with a spac
ing rack |52 which cooperates with a spacing
mechanism (not shown) similar to that illustrated
in Patent 1,904,164, to control the movement of
type carriage |42 to form character spaces, tend
|03 to impart in turn, downward movement to
p'aWl |02. In this manner, the ratchet wheel 92
is rotated clockwise one step, which vthrough the
ing in this movement to wind up a carriage re
cooperation of pressure rollers 9| and v94, acts in
turn spring mechanism (not shown). Upon re
cooperation with a web pulling device to deliver 20 ceipt of the carriage return signal, a function le
a predetermined amount of record material 49
ver (similar to .lever |01) is selected and the car
from the supply roll 83 to the printing zone and
riage return mechanism actuated in the manner
the projection area.
described in the aforementioned Patent 1,904,164.
The record material 49 is brought to the print
A pull bar bail |53 is mounted in the type carriage
ing position by means of a pulling or drawing .
mechanism now to be described. The record ma
terial 49 as it leaves roller 9| Yis directed around
guide rods |09, Ill and ||2.
|42
the
|54
‘|51
and is provided with a roller |54 carried on
bottom side thereof on a stud |55. Roller
operates between a pair of blades |56 and
of a main printing bail |56 so that bail |53
can be reciprocated by bail |58 in any character
These guide rods
may take the form of a fixed rod carrying guide
rollers thereon to eliminate friction. From the
guide rod | I2 the record material 49 is directed
v
vertically through the printing zone and projec
tion field to a guide rod | |3 carried by a U-shaped
shifting 'frame member | | 4 (Figs. 2 and 5) piv~
otally Vcarried on pivots | |5 suitably journaled in 3 5
the frame |5. The page material 49 is then di
rected around a guide rod ||1 carried in sup~
ports ||8 (Fig. 5) depending from bars ||9 se
provided with a. pair of arms |66 which carry a
Shaft |24 is interconnected through a friction
Continuous counter- =
of a belt |29 connected to a pulley |3| fixed to the
main operating shaft |32 of the page printing
apparatus shown in Patent 1,904,164. Shaft §32
ed on a shaft | 6| on which is also carried a print
ing bail actuator |62 which cooperates with a
printing cam |63. Actuator |62 carries 'at the
not permanently connected thereto, which is to
permit spring printing. Printing bail |58 is also
bars H9.
parted to pulley |28 through the instrumentality
connected to a printing blow adjustment means
as shown in Patent 1,904,164. Bail |58 is mount
ting relation only with printing bail |58 and is
frame I5. From thence, the page material 49 is
directed around a spindle |23 fixed to a shaft
|24 journaled in standards |26 supported on said
clockwise rotation (as viewed in Fig. 5) is im’
tened to the printing bail |58 is one end of a
printing spring |59, the other end of which is
end of its upper arm a stud |64 which has abut
cured to angle iron cross bars | 2| and |22 of
clutch |21 to a pulley |28.
spacing position ofthe type carriage | 42. Fas#
function lever bail |99. Also carried on shaft
|61 is a function bail comprising arms |65 and
|61, Arm |65 »is provided with a follower roller
which cooperates with a function bail cam |68,
'and arm | 61 supports on its end the function bail
blade |08.
Associated with the selector Vanes |30 are la
plurality of function levers |01 mounted on pivot
rod '|1| and provided with individual springs |12
gear |34 fixed to shaft |35 of a motor |36 (Fig.
which tend to rotate the function levers clock
2). Motor |35, therefore, through gears |34 and
wise into registry with the selector vanes |38.
|33, shaft |32, pulley |3|, and belt |29 imparts
continuous rotation to pulley |28 which through 55 The function levers |91 rare normally held out
of engagement with the selector vanes |38 by
the friction clutch |21 imparts a constant torque
means of the rod |69 of the function lever bail.
through shaft |24 to spindle |23. With this ar
As previously mentioned, the platen frame 82
rangement the page material 49 is maintained in
is pivotally supported on pivots 8| in side frames
a. taut condition between the spindle |23 and the
18 and 19. The platen comprises a circular disc
roller 9|. Thus, when the ratchet 92 is rotated
'|13 (Figs. 5, 8, 9 and 10) rotatably mounted on a
one step a predetermined amount of the page
carriage | 1-4 which is slidable cn rods |15 and
material 49 is delivered from the supply roller
|16 carried by platen frame 82. Platen carriage
83, which material is immediately taken up by the
|14 is connected to the type carriage, as will be
spindle |23 to preserve the taut condition of the
presently described, so as to be movable there
page material.
with, the effective printing edge of the platen |13
As disclosed in the aforementioned Patent
_being located coincident with the printing point
1,904,154, the page printer i6 is controlled tele
or zone determined by the path of operation of
graphically by a selector magnet |31. This is
the type bar |49.
connected in a signal line (not shown) on which
The platen frame 82 is adapted to be rocked
are impressed code combinations of signalling im 70
from the “letters” or unshiit position to the “fig
pulses. The code signals control, through a se
ures” or shift position in the manner fully set
lector magnet |31 of a sword and T-type selector
forth in the aforementioned Patent 1,904,164.
(not here shown, but illustrated and described in
Briefly, the side frame of the platen frame 82
said patent), a series of selectorl vanes |38 which
(as shown in Fig. 5) is provided with a lug |11
in turn controls through a series of bell Ycranks
carries a gear |33 which meshes with a pinion
.75 which operates between two adjustable stops |18
2,405,168
8 -
W
and |19. Adjacent to lug |11 there is pivoted
to the side frame of the platen frame 82 on pivot
| 8|, the upper end of a link |82, the lower end
of which is pivoted to the horizontal arm of a
bell crank lever |83 pivotally mounted at |84.
To the lower end of the depending arm of bell
crank |83 is pivoted a push bar |85, the free end
of which overlies a leftwardly directed arm of the
function lever |01. Push bar |85 is also provided
with a shoulder |86 which cooperates with the
pear) to prevent smudging during the printing
operation. As is well known, the type bar |49 is
provided with an upper case type face |96 and a
lower case type face |91 (Fig. 11). However, ac
cording to the `present invention the lower case
type face |91 is provided with a slope correspond
ing to the slope of the periphery of the platen
I 13 when in the lower case position. The dimen
sion 291 of the upper case type |96 is arranged to
be slightly less lower than the minimum height
2 i0 of the lower case type |91. When printing is
function bail blade |88. The platen frame 82 and
effected in the lower case position, the type face
platen |13 are shown in Figs. 5 and 8 in the “let
|93 being lower-than the type face |91, will not
ters” or unshiít position, with the stop lug |11
touch the record material and hence no smudging
against the upper stop screw |18. This condition
of the .printed record will occur.
is achieved when the function bail blade |08 has
When printing is effected in the upper case
operated upon the shoulder |86 to move the push
position, means is provided for preventing the
bar |85 leftwardly to rotate the bell crank |83
lower case type face |91 from coming into direct
clockwise, thus raising the link |82 to .cause the
contact with the surface of the record material.
platen frame 82 to rock clockwise.
To achieve this result a shield |95 is provided
20
A correspondingly similar construction is pro
which is adapted to be interposed between the
vided for the figures or shift mechanism. That
type face |91 and the platen |13 when printing
is a shift function lever similar to lever |91 is
is being effected in the upper case position.
provided which when selected is caused to ro
Shield §95 is secured to the ribbon oscillating
tate clockwise to bring its rearwardly extending
member
|99, which, as described in the aforemen
arm into operation to raise a push bar, similar 25 tioned Patent 1,904,164, oscillates the inking rib
to bar |85, into the path of the function bail blade
bon into and out of the path of the type faces dur
|08 which, when it is permitted to operate left
ing the printing operation. The ribbon oscillator
wardly (as viewed in Fig. 5) will cause a bell
|99 is pivotally articulated to arm 20| of a lever
crank,- similar to bell crank |83, to pull down a
202 which in turn is pivoted at 283 to a lever 204
30
link similar to |82 to rock the platen frame 82
pivoted at 229 to the type carriage |42. Lever 204
counterclockwise to bring its stop |11 against the
lower stop screw |19. The platen frame 82 is
maintained in its shift or unshift position by a
spring actuated detent member |81 acting on a
detent roller |88.
In Figs. 8, 9 and l0 is illustrated the manner
in which the platen carriage |14 is connected to
the type carriage |42 so as to be movable there
with. As previously mentioned the platen car
riage |14 is slidably supported on rods |15 and
|16. Carriage |14 is provided with an eccentric
stud engaged by the forked end of a bar |89, the
left end of which (as viewed in Fig. 9) is secured
to a member |9| which is secured by screws |92
to the type carriage |42. As viewed in Fig. 10,
the circular platen |13 is rotatably mounted on
the platen carriage |14 by means of an eccentric
means |93. By means of the adjustment |93 the
platen |13 is adjustable toward and away from
the record material to vary the clearance there (i O
between. Rightward and leftward adjustment as
viewed in Figs. 9 and l0, is also provided for the
is arranged to carry a roller 205 which rides on
the bottom side of a rail 206 mounted on the
platen frame 82, as disclosed in the aforemen
tioned Patent 1,904,164.
Roller 205 is pressed
against the rail 206 by a spring (not shown), so
that when the platen frame 82 is rocked between
the shift and unshift positions, roller 285 Will
constantly contact with said rail 295, and lever
202 will be reciprocated therewith. i
The depending arm 298 of the lever 202 is op
erably associated with the pull-bar bail |53 (Fig.
2) so that the reciprocative motion of bail |53
will cause the oscillation of the lever 292 about
pivot 203, whether the platen frame 82 is in the
shift or the unshift position. Thus, when the
bail |53 is in its normal position (the leftward
position as shown in Fig. 3), the lever 202 will
.iold the inking ribbon, through the instrumental
ity of the ribbon guide (not shown) located at the
upper extremity of member |99 (Fig. 8), in its
downward position to effect visibility of the
printed character. When the bail |53 moves
platen |13, through the instrumentality of the
rightwardly for a printing operation, the ribbon
eccentric adjusting means |90.
An important feature of the present invention 55 will be raised to printing. position due to the
counterclockwise movement imparted to the lever
is the provision of a platen so positioned as to
202 by the bail |53. When the platen frame 82
reduce to a minimum the obstruction of the pro
is
in the position shown in Fig. 8, which is the
jected image by the platen. To achieve this re
lower case printing position, the shield |95, upon
sult the platen |13 is tilted with respect to the
oscillation of lever 202, will not be raised suffi
record material printed upon, sufficiently to clear
ciently to be interposed between the type face |91
the light cone. The peripheral surface of the
and the platen |13. However, when the platen
.platen |13, upon which printing is effected, is
slightly beveled so that in one of the shift posi
tions of the platen the peripheral surface of the
platen will be parallel to the record material. In
the present embodiment the peripheral surface of
the platen |13 is parallel to the record strip when
the platen frame 82 has been shifted to the upper
case position as indicated in'Fig. 8 by the dotted
line |94 or the platen |13.
To compensate for this arrangement of the
platen |13, the type faces on the type bar |49 are
arranged as shown in Fig. ll. Moreover, this ar
rangement of type faces in cooperation with a
-shield |95 (Fig. 8) serves (as will presently ap
frame 82 is in the upper case printing position
with the platen |13 in printing relation with the
upper case type face |96, the shield |95 will, upon
reciprocation, be raised so as to become inter
posed between the lower case type face |91 and
the record material, thus preventing any ink
which has accumulated on the type face |91 from
smudging the record material.
As illustrated in Figs. 8, 9 and l0 there is pro
vided a platen rotator for automatically chang
ing the printing point of the platen |13 in re
sponse to each carriage return operation. As
previously described, the platen |13 spaces with
2,405,16á
9
the type carriage |42, -and accordingly is spaced
step-by-step for character spacing and, upon
reaching the end of the line, the platen |13 is re
turned rapidly with theÍ carriage |42 to the be
ginning-of-line position». In contact with the
platen |13 at a point opposite to the printing
point is a closely wound coiled spring 200 which
is connected at its ends to the side frame members
of the platen supporting frame B2, in such man
ner that the platen |13 is caused to rotate as it
advances during character spacing. Moreover,
upon the rapid return movement of the platen
|13 (under the influence of the carriage return
spring |50) during the performance of the car
riage return function, the platen |13 will, owing
to the combined sliding and rolling relation with
the yieldable spring member 200, rotate incom
mensurately, thus causing the same printing point
10
|23. Thus, for each reciprocal operation of the
push bar |06, the pawl 3|6 will be oscillated to
permit the record material to escape one unit of
length' corresponding to the line feed distance.
Another method of directing the record mate
rial 49 through the projection field- is illustrated
in Fig. 6. In this view, that portion of theY platen
frame 82 is shown which carries the platen car
riage |14 on rods |15 and |13. The platen is
shown in operative relationship with the type bar
|49. The supply roll of record material is posi
tioned above the frame. l5 as is the take-up mech
anism comprising spindle |23, and the record ma
terial is directed downwardly on the platen side,
as viewed in Fig. 6, and is guided around guide
rods 32| and 322, and then directed upwardly
on the type-bar side to the take-up mechanism in
the manner shown in Fig. 5 of the principal form
of the platen to -be presented to the type bars a
of the invention. An inking ribbon (not sh‘own)
minimum number of times. In other words, 20 is disposed between the type-bar |40 and the
through the instrumentality of the platen rotator`
record material 40 in the usual manner. The
233, the platen |13 is controlled in such manner
form of guiding means shown in Fig. 6 can be
as to reduce to a minimum the number of times
any particular printing point on the platen is
impinged upon, thereby reducing to a minimum
the wear at any given point and hence prolongingr
the life cf the platen. In lieu of the coiled spring.
20.3, a taut wire or cord can, of course, be used.
Modifications
used with. either transparent or opaque record
material. When transparent material is utilized,
the portion which is directed downwardly does
not interfere with the message to be projected
which' is printed on the upwardly directed por
tion.
In Fig. 7 there» is shown an alternate method of
mounting theY small reflecting mi-rror I9, which
In Fig. 3 is illustrated a stereoptican slide car
comprises pivotally mounting the mirror I9 at
rier 30| which may be employed with the printer
the point of pivotal articulation 323 between links
projector apparatus of the present invention. To
325 and 325, the opposite ends c-f which- are adapt
appropriate angle iron members of the frame I5
ed to be adjustably supported in slots 321 and
are secured cross bars 302 and 303, between which e; 328 in frame l5. The point 323 of support of
is suitably supported a post 304 on which is
mirror |51 is adjustable universally by manipu
swingably mounted the slide carrier 30|. Slide
carrier 30| comprises hinge members 385 and
3% engaging the post 304. A pair of side mem
bers 391 and 308 are secured to the members 335
and 366 in such manner as to define a projection
area S89. To the members 305 and 306 are se
cured a pair of spring members 3|I and 3|2, re
spectivelyy having their overhanging edges so
conformed as to provide grooves to receive the
stereoptican slides. The resiliency of the spring
clips 3| | and SI2 will serve to hold the stereopti
can slide in place securely. The lower hinge
member 306 is provided with a pair of notches 3 | 3
which cooperate with a spring actuated detent r
pawl 3M, to retain the slide carrier in its loading
'and its projecting positions.
An alternate form of record material delivery
mechanism by means of which the record mate
rial may be withdrawn from the supply roll 83
(Fig. 5) is shown in Fig. 4. This mechanism
comprises an escapement means controlled by the
line feed mechanism of the printer. Specifically,
an escapement wheel 3|5 is substituted for the
ratchet wheel 92 and is fixed to shaft 03.
Coop
erating with the wheel 3|5 is a double escape
ment pawl 3|6, pivotally carried on a pivot 3|0.
A link 3|? is connected at one end to the pawl
356 and at the other end to one arm of a bell
crank lever 3 I8, comparable to line feed bell crank ‘
lating the adjusting screws in slots 321 and 3128.
Moreover, the angle of the mirror I9 is readily
adjustable through the medium of clamping>
screws at pivot 323.
It is, of course, manifest that the features here
in disclosed may be modified without departing
from the spirit and scope of the present inven
tion, which is intended to be limited only as set
forth in the appended claims.
What is claimed is:
1. In combination, a printing device, a type
carriage movable to form character spaces, means
for directing record material through said device
comprising means for guiding said material in a
vertical plane above and adjacent to said type
carriage, means for producing a printed record
on said record material comprising a rotatable
platen, said platen comprising an inverted con
ical frustum, said frustum tiltably positioned so
that its peripheral surface adjacent said record
material is substantially parallel to said record
material, whereby a minimum portion of said
platen is exposed to the field of projection, means
effective under certain operating conditions to
change the rotational position of said platen in
commensurately, and means comprising a pro
jection system for projecting onto a screen im
ages of the characters produced on said record
material.
|03, shown in Fig. 2'. Hence the bell crank lever
2. In combination, a printing device having a
3 I3, in the alternate form, is substituted for lever
type carriage movable to form character spaces
|03, and is carried on pivot |04. The line feed
and a platen, said platen comprising an inverted
push bar | 06 is articulated to the bell crank lever
conical frustum, said frustum tiltably positioned
3í8, the actuation of which, through bar |06, is
adjacent a web so that its peripheral surface
similar to the manner previously described.
nearest said web is substantially parallel thereto,
With the form of the invention shown in Fig. 4,
whereby a minimum portion of said platen is ex
the shaft 93, and hence escapement wheel 3|5,
posed to the field of projection, means for draw
constantly tends to rotate due to the pull im
ing said web through said device comprising a
parted to the record material 49 by the spindle 7 pulling
device disposed beyond the exit end of
2,405,1ce
ll
said vertical-projection field which is located im
mediately above and includes said platen and
12
graph receiver mounted in said framework in co
operative relationship with said lamp housing and
lens system, a web directing means so arranged
delivery means positioned in advance of said
with respect to said receiver and lens system as
platen, and means comprising a projection sys
5 to provide a vertical projection field illuminated
tem for projecting onto a screen images of the
by said rays of light, recording means in said re
character produced on said web.
ceiver for producing lines of printing on a trans
3. In a projector having a stationary Vertical
parent web in said projection field, means for di
projection ñeld, means for directing a web
recting
said web twice across the same light rays
through said projection field, a printing device
ñrst
downwardly
then upwardly so that con
comprising a type carriage and a rotatable platen,
fronting planar surfaces of said web are disposed
said platen comprising an inverted conical frus
in face to face alignment, and to direct said lines
tum, said frustum tiltably positioned adjacent
of printing, which are produced upon the up
the web so that its peripheral surface nearest the
wardly moving section of the web, in an upward
web is substantially parallel thereto, whereby a
direction across said projection field without in~
minimum portion of said platen is exposed to
terfering with the printed record, and mirrors
the field of projection, means for advancing said
and an objective lens cooperating with each other
carriage to form character spaces, carriage re
so as to produce upon a screen an image moving
turnV means, means for rendering said platen
thereacross in correspondence with the movement
movable with said carriage, and means effective
upon each operation of said carriage by said car 20 of the web through said projection field.
6. In combination, a projector having a verti
riage return means to change the rotational po
cal
projection iield, a light source and condensing
sition of said platen incommensurately.
lens
system to illuminate said field, means for
4. In a projector, means to project rays of
directing a web through said field, a printing de
light, a stationary projection ñeld illuminated by
vice comprising a type carriage and a rotatable
said rays of light, means for directing a trans 25
platen movable therewith, said platen comprising
parent web twice across the same light rays, said
an inverted conical frustum, said frustum tilted
means including means for causing said web to
to correspond with the angularity of the side of
retrace its path so that confronting planar sur
the light cone and positioned adjacent the web
faces thereof are disposed in face to face align
ment, and a printing device comprising a type 30 so that its peripheral surface nearest said web is
substantially parallel thereto, whereby a mini
carriage and platen for producing a printed rec
mum
portion of said platen is exposed to the
ord on said web as it passes in one direction
through said ñeld without affecting the operative
relationship between said projection field and
said web as the latter passes in the opposite di
rection through said field.
5. In a projection system, a framework, a lamp
housing and condensing lens system supported on
said framework to project rays of light, a tele
field of projection, means for moving said car- -
riage, means responsive to the movement of said
35 carriage for rotating said platen incommensu
rately, and means comprising a projection system
for projecting onto a screen images of the char
acter produced on said web.
REGINALD G. SCHULER.
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