Патент USA US2405168код для вставки
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 9 FIG. 8 4 Sheets-Sheet 4 8| | _ 77 I8' 82 |94 |79 Il' I ‘ |79 |96 l" _ |73 |87 ` »»»» " ' 20o _ ? É _ |76 E El 206 205 220 ~ |99 203 ,9| 20, ì |49 |95 _ |99 FIG. 11 204 , |49 ’E |75 '74 |90 |97 ' ' , 202 208 s_L |42 llllllhlllllunnnummlllIlllll ISI i90 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.