Патент USA US2405173код для вставки
Aug. 6, 1946.¿ J. ZENNER ' ' ,4,W APROJECTQÍR FOR PAGE PRINTERS »Filed July 17. 1940 - FIG. >4 27 @ v ” ' 'r‘sheets-she‘et 2 66 67 " 2,4m@ w. „L ZENNER ' PROJECTOR FORA PAGE PRINTERS Filed July l’T, 1940 . 7 Sheets-'Sheet _3 l WALTER J. ZENNER Aug, î?? > w. J. ZENNER 4PROJEFJ‘IL’OR FOR PAG-E PRINTERS ` Filed July 17', 1940 7 Sheets-snaai 4 ‘ m wm OWN INVENTOR. WALTER .1. ZENNER. BY Àug, 6, w46. w. J. ZENNER Èßûâßìâ PROJECTOR Fon PAGE PRINTERS Filed ¿um 17, 1940 7 Sheets-Sheet 5 @_ -l ä 5 3N . I; @www W o~ hO L/ .\mw Ó , ,„ www l . r \ „É , m_\|J`\/\L ..mm.. mm. vœm.SNmmm .9... m.KÉ INVENTOR, WALTER J.' ZENNER A T?oRNEY. " Àug. 6, i946, w. J. ZENNER PROJECTOR FOR PAGE PRINTERSFiled July 1'?,v 1940 2,495,173 7 sheets-¿Sheet s INVENTOR. WALTER -J. ZENNER MM v 4TTORNEY, mg. 6, _ma w. J. ZENNER , PROJECTOR FOR PAGE PRINTERS Filed Jul;r 17. 1340 ¿4659MB 7 vsneets--sheei 'r 1NVENTOR, ,- BY WALTER .1. zENNx-:R Patented Aug. 6, i946 2,405,173 UNITED STATES » PATENT OFFICE Waiter J. zeur-ier, Des Plaines, nl., a‘ssiinio'r> to 'l‘eletyllßy Corporation, Chicago, Ill., a corpora tion of Delaware Application July 1'7, 1940, seria-IN1). 346,004 i s claims. (c1. zie-§24) 2 The present invention pertains to printing tele . phane web is permitted te escape from the sup graph projection systems and apparatus and more ply roll in a stëp-by-step manner, nevertheless said web is maintained taut between the,web withdrawing or supply roller and the web take-up particularly to combination page printers and projectors for displaying on a screen or inspec tion area information in enlarged characters. The primary object oi the invention is to pro vide an efficient and reliable projection system mechanism. Y The latter mechanism comprises a paper or web pulling device whereby the web'is pulled past the printing point and through the for displaying on a screen telegraphically re projection field after the printing of a line. ' È’urther features of the invention reside in Another object of the invention is to provide 10 providing a lamp housing having a baille plate a printer-projector in which the parts of theV ceived message matter. cooling means utilizing convection currents of air between the outer casing‘and the bane plate; a disc platen movable with the type carriage where in printing -isl effected on the peripheryy of the receiving printer are arranged and constructed to facilitate the projection and display of printed matter resulting from operation of a printing telegraph receiver. ì disc and the number vof hidden printed charac ters is reduced to a minimum; and three-point mounting of the large or upper reflecting mir ror to eliminate the possibility of injury to the According to the present invention a projection 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 mirror due to twisting action. . ning account of received message matter, through The foregoing and other objects and features the instrumentality of an optical system com 20 of the invention will appear from the following prising an arrangement of inclined mirrors so detailed description taken in conjunction with that the printer and lamp housing may be 1o the _accompanying drawings, in which, cated at the lower part of a suitable cabinet, Fig. l is 'a perspective view_of the projection and the screen formed as a part of theA upper forward wall of the cabinet and positioned above 25 cabinet with a part of the Wall broken away to the printer compartment. show schematically the optical and projection ` system ; Speciñcally, the page printer is mounted on rails supported in a structural frame to which is pivotally mounted the lamp housing, in >such manner that the lamp housing with its condens 1 . ' Fig. 2- is a cross-sectional view of therprinter projector according to the present invention; j 30 y Fig. 3 is a 'fragmentary' perspective view show ing the manner> of attaching the'screen to the ing lenses is positionable so as to embrace within cabinetj y l the field of projection the last line of printing, F’ig~ 4 is a detail cross-sectional lview> of the and also to include eight or ten printed lines». Printing is effected on a cellophane strip and the 35. large reñe'cting mirror; Fig. 5 isan enlarged sectional view taken on image of the record produced thereon is pro line 5--5 ofF'îS. 2; jected through the optical system onto the screen. Fig.. 6 is an enlarged side view and partial The cellophane web or strip is drawn upwardly `section of the printer mechanism and associ through the projection ñeld. rIfhe characters on ated lamp housing and part of the optical ar the section of the web in the projection ñeld are so arranged as to form horizontal 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 the screen moveup wardly across the screen similar to the movement of the web through the projection field. The lamp housing together with the condens ing lenses is swingable upwardly about its piv otal articulation with the structural frame to permit ready access to the page printer. The frame is movable on rails so that the entire struc ture including the printer and lamp vhousing may be rolled outwardly to permit withdrawal and thusy render the apparatus carried by said frame accessible for servicing. A featurev of the arrangement according to the present invention resides in the means for case 40 rangement; j Fig. 7 is a plan view of the lamp housing and len‘s` support taken on line 1;'1 of Fig. 2; Fig». 8 is a plan View of the printer-projector apparatus; .I i' Fig. 9’k is' an eievauonn view of the printer projectorv apparatùsi Fig. v10 is an enlarged cross-sectional view'- of thev printer platen and platen frame; Fig.A 11 is a View taken substantially on line H_il ofi-iig. 10; v Fig. 12 iSn a" top' 'View of the part òf the printer mechanism s'hoilv'nn in Figs. 10`and 11; Fig. 13 is a perspective view of the shift control mechanism for the _projection ñeld; Y Fig. 14 is an enlargedV cross-sectional view of >the connection between the platen frame andthe shifting the cellophane web in the projection shift control mechanism for the projection field; field to control accurately the shifting move ment of the printed record. Although the cello 60 Fig.y 15 is an elevational view of the stere opticon sllde- carrier of the present invention; 2,405,173 4 ‘E o enlarged mounting holes for plates 45, by the Fig. 16 is a side view, partly in section, of the slide carrier shownin Fig. 15; Fig. 11 is an enlarged lside outer casing _21 of the lamp housing I1. @In the embodiment of the invention shown in essere type; par' the drawings, a condensing lens system I8, com prising two plano-convex lenses and one con veXo-convex lens, is provided, these lenses being . suitably clamped by clamps 44 (Fig. 7) to plates head; and Fig. 18 is a sectional View taken on line I8-I8~_¿.. of Fig. 9. Having reference to the drawings in which like ' reference characters 28, 46 and 41 which are appropriately separated by spacing posts 50 and 5I. Plate 41 is secured alongpits top edge to a crossbar 48 (Fig. 2) of indicate , similar ,_ parts ì, . throughout the several viewsjthe combination,v page printing and projecting'apparatus accord frame 26. Plates 28, 46 and 41 are suitably aper ing .to the present invention is housed in a cabi ‘ tured `to provide a held of projection of such area as to present upon the screen i3 (Fig.v l) a net, indicated generally by theV numeral: vI I, which is provided in the lower portion .thereof j predetermined number of lines of printing pro with a door I2, and in the upper portion with 'a duced on the record strip or web 49 of transpar translucent projector screen I3. Secured to the floor of cabinet II are'twofangle iron rails I4 ent material. the present invention includes a mirror I9 and an objective lens 2I. The optical system also includes a mirror 5I (Fig. l) supported in the ports the page printing apparatus, indicated gen erally ‘by the numeral I6, the lamp housing I1, upper part of the cabinet II, and through this system the image is projected upon the screen I 3. The mirror I9 is adjustably pivoted on a pair of standards 52 by means of which its angular po sition may be determined. Moreover, standards andthe voptical arrangement represented gen erally by condensing lenses I8, small mirror I9 and objective lens V2I. tWheels 22 are journaled to .thebottom side members of the vframe I5 and „co-operate in rolling relation with rails I4„which are ‘provided with indentations 23 into Vwhich the wheels 22 are admitted when the frame I5, 52 are adjustably mounted on brackets 53 se cured to frame I5. The objective lens 2 I is >adapt ed to be -adjustably clamped by a clamping band 54 which is supported on a U-shaped bracket 56, in 'assuming its fully inserted position in the cabi net I I, rests upon spacing ‘bosses 25.` In the fully inserted position, the framelä` is anchored by ' As previously mentioned, the optical system of (onlycne of which is shown in Fig. l) which pro vide a track for the frame I5 (Fig. 2)V which sup 30 means of ,bolts 30 to the base vof the cabinet- I l. With this arrangement, the frame is easily in sertable in the cabineti‘fI‘I by'means of rollers which in turn is secured to a crossbar 51 on frame l5. Thus, the adjustable mountings pro vided for the mirror I9 and the objective lens 2I facilitate the proper positionment of the image on the screen. 22, and moreover _is’adapt'edvwhen the proper Mirror 5I is supported at three points to mini mize, or even eliminate the possibility of injury to position has been’assumedgfto rest> upon bosses 25,'and then toV be anchored tó'the 'ì cabinet II the mirror due to a twisting action. Mirror 5I is by the bolts 36 (Figs;2 and 5)."> ‘ secured to the cabinet I I through the instrumen tality of a bracket 58 located centrally of the bot tom edge of the mirror~ At each of the upper " `» At each side of frame I5 and disposed at the 'rear thereofv are pivot supports'24 for a U-shaped frame' 26 (Fig.’7) which carries the'lamp‘hous' corners offmirror 5I is provided a bracket 59 by means of which the mirror is secured to the roof of cabinet I I. Mirror 5I is in the form of a regu „ ing I1 and condenser lenses I8.- "A bar 20 (Fig. 6) is pivoted to frame 26 and the lower’jen‘d of K said b_ar is provided with a ‘hook portion >'(not shown) wby which, when Vtheframe 26 is swung Y upwardly about pivots 24 `to facilitate removal o_f the printer for servicing, the bar is held ins-its upward position by the engagement ofsaid 45 lartrapezoid, with the shorter of the parallel sides positioned' contiguous to bracket 58. The trape zoidal shape of the mirror 5I conforms to the effective shape of the ñeld of projection at the angleat which Vmirror 5i is placed in cabinet Il. ~ hooked portion with a spacer stud 40 (Fig. 8), Mirror 5I, so shaped, produces a rectangular vis in a well-known manner, the bar 26 thus ‘serving 50 ual field or iìeld of projection on screen I3, which as a brace or support. The lamp housing vI1 com accordingly is of rectangular conformation. prises an outer casing 21 (Figs.- 2 -and '7) ‘which Mirror 5I is mounted in -a shock-proof frame is secured to a plate 28 fastened to a crossbar 23 ' substantially as shown in Fig. 4. In the present of the frame 26. vContained within the lamp embodiment, the mirror frame comprises angle i housing l1 and suitably spaced from the outer iron sides 6I suitably secured at the corners of the 55 casing 21 thereof is a baille plate 3l which rests frame, and- the-mirror 5I is laid in this frame 'upon the bottom of Vthe housing I1 and’extends -uponfeltstrips 62 interposed between the mirror tothe top, as illus , upwardly’to `a point close and the angle iron. A layer of mastic (or other trated in Fig. 2, The bottomlof the housing I1 nonhardening) cement 63, which has the proper is provided, between the outer casing 21. and the 60 ties of adhesiveness, is spread evenly over the baffle plate V3|, with apertures 32. This construc tion permits the ilow of convection currents be plate 3I ltween the outer casing 21 and the,I1baille is provided for cooling purposes. Housing mirror 5I upon which is laid a metal backing plate 64, The felt strip 62, mirror 5I, mastic ce ment 63, and metal plate 64 are appropriately clamped together by means of strips of angularly , with a cover 33 having a grilled -section 34 cov 65 shaped clamps 66 secured by screws 61 to frame ered by a meshing if desired. Depending vfrom 6I. Mirror 5I is a built-up assembly of shatter the cover 33 and spaced therefrom is a baille proof glass, the mirrored surface being located plate~ 36 (Fig. 2) of substantially the »same area between the two layers of glass. The metal back as the opening 34'.- To protect the >condensing ing plate 64 may be further reinforced by rein lenses I‘B from the heat of lamp 31, the bottom of forcing strips 68. ' y the housing I1 maybe cut away as at `38; Lamp 70 The' projection screen I3 is composed of trans 31 is adjustably ‘clamped to a bracket 39,«'which lucent material so as to permit an image to be in turn is'adjustably supported by the 'floor of Aprojected on to it from the rear and be visible the housing I1. A reflector 4I is spring clamped from the front of the screen. In the present form by a carrier 42 which is adjustably supported, of the invention the screen I3 is provided with a through the 'instrumentality of a rodl 43 and the 2,465,173" 6, stout binding 69 having eyelets 'H therein. The selected to raise the free end of push bar | |16 up-' cabinet I I is provided with a series of studs or wardly into the path of the function bail blade buttons 12 properly spaced around the edge of |08. Then, when the push rod |96 is actuated the'opening to be covered by screen I3. The leftwardly by the function bail |08, clockwise ro screen I3 is then fastened to the cabinet II by means of a lacing 13 which passes alternately 5 tation is imparted to bell crank lever |03 to im part in turn, downward movement to pawl |02. through eyelets 1| and studs 12, and in this man In this manner, the ratchet wheel 92 is rotated ner the screen is drawn tightly and evenly across clockwise Vone step, which, through the co-operaa the opening provided therefor. A corner strip 15 tion of pressure rollers 9| and 94, acts in co-op is provided around the edge of the screen |3 to eration with a web pulling device to deliver a pre protect the lacing connection between the screen and the cabinet. determined amount of record material 49 from the supply roll 83 to the printing zone and the A blower or exhaust fan 14 (Fig l) is located projection area. at the upper part of the cabinet || and is posi The record material 49 is brought to the print tioned behind the mirror 5|. Blower 14 is so mounted that its exhaust port projects through 15 ing position by means of a pulling or drawing mechanism now to be described. The record an aperture 16 in cabinet II, and is suitably sup ported in said cabinet. Having reference to Fig. 2, a page printer of material 49 as it leaves roller 9| is directed around guide rods |89, III and ||2. These guide rods may take the form of fixed rods, carrying guide the type shown in U. S. Patent 1,904,164 is mount ed in the frame I5. The printer, indicated gen-> 20 rollers thereon to eliminate friction. From the guide rod ||2> the record material 49 is directed erally as I 6, has been modiñed in certain respects vertically through the printing zone and projec to adapt it for use with the projector of the pres tion field to a guiderod I I3 carried by a U-shaped ent invention` The page printer comprises the shifting frame member |14 (Figs. 2, 6, 8 and 13) side frames 18 and 19 (Fig. 6) to which is pivoted pivotally carried on pivots |I5 and IIB (Fig. 8) at 8| a platen frame, indicated generally as 82. suitably journaled in the frame I5. The page The usual cylindrical form of platen has been dis material 49 is then directed around a guide rod pensed with in the present embodiment of the ||1 carried in supports || 8 (Fig. 6)’ depending invention and has been substituted by the disc from bars ||9 secured to angle iron crossbars I2| form of platen |13 shown in Figs. l0, 11 and 12, and |22 of frame I5. From thence, the page» and which will be hereinafter described. material 49 is directed around a spindle |23 ñxed To provide a running account of the message to a shaft |24 journaled in standards |26 supé printed on the page material, a delivery mech ported on said bars ||9. anism is provided which comprises a means for permitting the record material to escape from the Shaft |24 is interconnected through a friction clutch |21 (Fig. 8) to a pulley |28. Continuous counterclockwise rotation (as viewed in Fig. 6) is imparted to pulley |28 through the instrumen tality of a belt |29 connected to a pulley I3| fixed to the main operating shaft Í 32 of the page print-. supply roll, suitable guides, and a web pulling means whereby the page material is advanced through the printing zone. T_he page material 49 in being delivered from the roll 83 is directed over a slack bar 84 which is pivoted at 85 and is normally biased clockwise by a spring 86 to main ing apparatus shown in Patent 1,904,164. Shaft ' |32 carries a gear |33 which meshes with a pin-Y ion gear |34 fixed to shaft|35 of a motor |36 tain the page material or Cellophane web taut between the roll 83 and a flanged cylindrical guide 81 carried on a shaft 88 journaled in plates 89 (Fig. 2). Motor |36, therefore, through »gears |34 and |33, shaft |32, pulley |3|, and belt |29 im parts continuous rotation to pulley |28 which through the friction clutch |21`i'mparts a con* fixed a ratchet wheel 92, the ratchet wheel and stant torque through shaft |24 to the spindle |23. roller being carried on a shaft 93 journaled in the plates 89 secured to side frames 18 and 19. Co With this arrangement the page material 49 is operating with the roller 9| is a pressure roller maintained in a taut condition between the spin 94 which is carried on a standard 96 secured to 50 dle I 23 and the roller 9|. Thus, when the ratchet depending from side frames 18 and 19. The web 49 is then directed over a roller 9| to which is 4." 92 is rotated one step a predetermined amount of the page material 49 is delivered from the supply a rock shaft 91. Pressure roller 94 is drawn into pressing relation with roller 9| Iby means of a spring 98. Secured to rock shaft 91 and located in- juxtaposition to plate 89 is a pressure roller ' roller 83, which material is immediately taken up by the spindle |23 to preserve the taut condi' release lever 99. Co-operating with lever 99 is 55 tion of the page material. a shoulder |0| on plate 89 arranged so that when As disclosed in the aforementioned Patent 1,904,164, the page printer I6 is controlled tele graphically by a selector magnet |31. 'I‘his is lever 99 is actuated counterclockwise (as viewed in Fig, 6) against the action of spring 98 it will latch-up behind or on the left-hand side of the shoulder IGI, thereby releasing the pressure roller 94 from engagement with pressure roller 9| and connected in a signal line (not shown) on which 60 are impressed code combinations of signaling iin pulses. The code signals control, through the maintaining this condition until lever 99 is again selector magnet I 31 of a sword and T=type se released from the shoulder IUI to permit spring lector (not here shown, but illustrated and de~ 98 to bring roller 94 again into pressing relation scribed in said patent) a series of selector vanes with roller 9 I. Associated with the ratchet wheel 65 |38, which in turn controls through bell cranks 92 is a pawl member |92 (Fig. 2) which is loi-voted |39 (Fig. 9) a set of curved code bars | 4| (Figs. to a bell crank lever |03 carried on a pivot shaft |04. The depending arm of bell crank |03 is piv 6 and 9). Code bars |4| and bell cranks |39 are supported on a movable type carriage, indie cated generally by the numeral I 42, which is prok oted to one end of a push rod |06, the other end of which is shouldered to co-operate with a func 70 vided with rollers |43 and |44 whereby it is adapt ed to travel on tracks |45 and |46, respectively, tion bail |08 in the manner shown in the afore mentioned Patent 1,904,164. Thus, in response to a' predetermined selection a function lever, 4similar to function lever |01 shown in Fig. 6, is positioned between side frames 18 and 19. Co operating with code bars I 4| are a plurality of pull bars |41 having individual springs |48. 75 Pull ‘bars |41 are operatively connected by rack 2,405,173 7 and pinion connections to a corresponding plu 8 crank lever |83 pivotally mounted at |84. To the lower end of the depending arm of bell crank |83 is pivoted push bar |85, the free end of which cverlies a leftwardly directed arm of the func ing rack |52 which co-operates with a spacingr tion lever |01. Push bar |85 is also provided mechanism .(not shown) similar to that illus with a shoulder |86 which co-operates with the trated in Patent 1,904,164, to control the move function -bail blade |08. The platen frame 82 ment of type carriage - |42 to form character and platen |13 are shown in Figs. 6 and 10 in the spaces, tending in this movement to wind up a “letters” or unshift position, with the stop lug |11 carriage return spring mechanism, indicated gen against the upper stop screw |18. Thiscondition 10 erally in Fig.,8 as |50, the strap |60 of which is is achieved when the function bail blade |08 secured tov studV |10 Yfastened to type carriage |42. has operated upon the shoulder |86 to move the Upon receipt of the carriage return signal, a push bar |85 leftwardly to rotate the bell crank function lever (similar to lever |01) is selected |83 clockwise, thus raising the link |82 to cause and the carriage >return _mechanism actuated in the platen frame 82 to rock clockwise. themanner described in the aforementioned Pat A correspondingly similar construction is pro ent 1,904,164. Carriage return mechanism |50 is vided for the ñgures or shift mechanism. That thereupon permitted, due to the energy stored is, a shift function lever similar to lever |01 is therein, to return the type carriage |42 to its provided which when selected is caused to rotate normal or beginning-of-line position. clockwise to bring its’ rearwardly extending arm .A pull bar bail |53 is mounted in the type car into operation to raise al push bar, similar to bar riage |42 and is provided with a roller |54 carried |85, into the path of the function bail blade |88 on the bottom side thereof on a stud |55. Roller which, when it is permitted to operate leftwardly |54 operates between a pair of blades |56 and (as viewed in Fig. 6) will cause a bell crank, sim. |-51 of a main printing bail |58 so that bail |53 ilar to bell crank |88, to pull down a link similar can be reciprocated by bail |58 in any character 25 to |82 to rock the platen frame 82 counterclock spacing position of the type carriage |42. Fas wise to bring its stop |11 against the lower stop tened to the printing bail |58 is one end of a screw |19. The platen frame 82 is maintained printing spring |59, the other end of which is in its shift or unshift position by a spring actu-A connected to a printing blow adjustment means ated detent member |81 acting on a detent roller 30 as shown in Patent 1,904,164. Bail |58 is mount |88. ed on a shaft [6| on which is also carried a print An arrangement is provided, according to the ing bail actuator |62` which co-operates with a present invention, for accurately controlling and printing cam |63. Actuator |62 carries at the accelerating the shifting movement of the por -end of its upper arm a stud |64 which has abut 35 tion of the record material which is in the field of ting relation only with printing bail |58 and is projection, in response to corresponding move not permanently connected thereto, which is to ment of the platen between the upper and lower permit spring printing. Printing ~bail |58 is also case shift positions. Accelerating the web shift provided with a pair of arms |66 which carry a minimizes the optical effect upon the image. As function lever bail |69. Also carried on shaft previously alluded to, the U-shaped shifting ‘ |6| is a function bail comprising arms |65 and 40 frame member H4, which is pivotally supported |61. Arm |65 is provided with a follower roller at ||5 and ||6 in the frame l5, carries a guide which co-operates with a function bail cam |68, rod | |3V for the record strip 49 which co-operates and armV |61 supports on its end the function with guide rod ||2 to guide the record material bail blade |08. ’ through the field of projection. Frame member Associated with the selector varies |38 are a 45 H4 is operable- between adjustable stops 244 and plurality of function levers |01 mounted on pivot y 245 mounted on arms `246 and 241, respectively, rality of type bars |49 pivoted on a shaft |5|. 'Type carriage |42 is also provided with a spac rod |1| Yand provided with indi -dual springs |12 ywhich-tend to rotatek the function levers clock wise into registry with the selector vanes |38. The function levers |81 are normally held out of engagement with the selector vanes |38 by means of the rod _|69 of the function lever bail. 'A_s previously mentioned, the platen frame 82 .is pivotally supported on pivots 8| in side frames 18 and 19. The platen comprises a circular disc |13 (Figs. 6, 9, 10, 11 and 12) rotatably mounted on a carriage |14 which is slidable on rods |15 and |16 carried by platen frame 82. Platen car riage |14 is connected to the type carriage, as will be presently described, so as to be movable therewith, the effective printing edge of the platen |13 being located coincident with the printing point or Zone determined by the path of opera tion of the type .bar |49. Y The platen frame 82 is adapted to be rocked from ,the “letters” or unshift `position to the “fig ures” or shift position vin the manner fully set of bracket 248 fixed to the cross bar |2| (Figs. 6 and 13). Mounted on bracket 248 are elements compris ing an overcentering device which co-operate with the shift frame 82 to effectuate the control of the record strip in the projection field. The overcentering device comprises a lever arm 249 ~ pivoted at 25| to bracket 248, and is articulated to the member |||4 at 252. Lever 249 terminates in a forked end 253 in which a stud 254 is slidably operable. Stud 254 is mounted on the end of a. lever arm 255 pivoted at 256 to bracket 248. A spring 251 is extended between stud 1254 and a springpost 258 carried on bracket 248. Spring post 258 and pivots 25| and 256 are arranged on a common center line substantially intermediate the stops 244 and 245 sok that bar I I4, after pass ing over center above or below said line, will be urged` by spring 251 against stops 244 or 245, respectively, Member `| I4 is connected to the platen frame 82 by means of a pair of lever members 259 and Briefly, the side frame of the platen frame 82 26| which are pivoted to frame 82 at 262and 263, (as shown in Fig. 6) is provided with a lug |11 70 respectively (Figs. 6 and 13). Members 259 and ' which operates between two adjustable stops |18 26| are each provided at the upper end thereof and |19. -Adjacent to lug |11 there is pivoted with an open-ended slot 260 which fits over the frame 82 on pivot to the side frame ofthe platen shank of a headed ,stud 281 and 266, respectively. |8|, the upper end of a link |82, the lower end With this arrangement, the members 259 and 26|, of which is pivoted to the horizontal arm of a bell A* forth in the aforementioned Patent 1,904,164. ' 2,405,173 may be easily disconnected from studs 265` and 266 so as to render the printer readily detachable from the frame l5. Supported by the depending la shield |95 (Fig. 10) serves (as will presently appear) to prevent smudging during the printing operation. As is well known, the type bar |49 arms of the levers 259 and 216| is the previously is provided with an upper case type face |96 and mentioned guide rod ||2. Levers 259 and 26| a lower case type face |91 (Fig. 17). However, are normally urged in a counterclockwise direc according to the present invention the lower case tion (as viewed in Fig. 13) about their respective' ytype face |91 is provided with a slope correspond pivots 262 and 263 by individual springs 264 an ing tothe slope of the periphery of the platen |13 chored to spring posts 205 ñxed to rail ‘.206 of the when in the lower case position. The dimension platen frame `82 (Fig. 14). 10 201 of the upper case type |96 is arranged to be Having reference to Figs. 6 and 13, the frame slightly less than the minimum height 2|0 of the ||4 is illustrated as movable with platen frame lower- case type | 91. When printing is eiîected 82. - To assure a definite extent of movement of in the lower ease position, the type face |96, frame H4, the stops 244 and 245 are provided. The platen frame 82 is shiftab-le between stops 15 being lower than the type face | 91, will not touch the record material and hence no smudging of |18 and |19 by the spring action of detent |81 the printed record will occur` which is in the nature of an overcentering means When printing is eiîected in the upper case because, as link |82 acts to rock the platen frame position, means is- provided for preventing the 82 between the two shift positions, the camming action of detent |81 operates to assist and hasten 20 lower case type face |91 from coming into direct contact with the surface of the record material. the shifting movement. The action of the over To achieve this result a shield |95 is provided centering device mounted on bracket 248 is com which is adapted to be interposed vbetween the parable, and to permit this assisting action, the type face |91 and the platen |13 when printing hole 266 (Fig. 14) in each of the levers 259 and 26| is elongated so that the overcentering action 25 is being effected» in the upper case position. Shield |95 is secured to the ribbon oscillating takes eiîect immediately upon passing over cen member |99, which, as described in the afore ter independently of the entire movement of mentioned Patent 1,904,164, oscillates the inking platen frame 82, and urges frame | I4 into proper ribbon into and out of the path of the type faces position against one or the other of the adjust able stops 244 or 245. In other words, the platen 30 during the printing operation. The ribbon oscil lator |99 is pivotally articulated toarm 20| of a fra-me 82 begins the movement of the frame | I4, lever 202 which in turn is pivoted at 203 to a lever and the overcentering device completes this 204 pivoted at 220 to the type carriage | 42. Lever movement suddenly upon passing over center, the 204 is arranged to carry a roller 205 which rides elongated holes 266 permitting the overcentering device to take the control of the frame ||4 from 35 on the bottomI side of a rail 206 mounted on the the platen frame 82. platen frame 82, as disclosed inthe aforemen tioned Patent 1,904,164. Roller 205 is pressed In Figs. 10, 11 and 12 is illustrated the Inan against the rail 206 by a spring (not shown), so ner in which the platen carriage | 14 is connected that when the platen frame 82 is rocked between to the type carriage |42 so as to be movable there with. As previously mentioned, the platen car 40 the shift and unshift positions, roller 205 will constantly contact with said rail 205, and lever riage |14 is slidably supported on rods |15 and 202 will be reciprocated therewith. » The depending arm 208 of the lever 202 is op erably associated with the pull bar bail |53 (Fig. to a member |9| which is secured by screws> |92 6) so that the reciprocative motion of bail |53 will cause the oscillation of the lever 202 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. 6), the lever 202 will .to the type carriage |42. As viewed in Fig. 12, the circular platen |13 is rotatably mounted on the platen carriage |14 by means of an eccentric screw means |93. By means of the adjustment |93 the platen |13 is adjustable toward and away 60 hold the inking ribbon, through the instrumen material to vary the clearance tality of the ribbon guide (not shown) located at the upper extremity of member |99 (Fig. 10) , in in Figs. l1 and 12, is also pro its downward position to effect visibility of the vided for the platen |13, through the instrumen printed character. When the bail |53 moves tality of the eccentric adjusting means-|90. rightwardly for a printing operation, the ribbon An important feature of the present invention vwill be raised to printing position due to the is the provision of' a, platen so positioned as to counterclockwise movement imparted to the lever reduce to a minimum the obstruction of the pro 202 by the bail |53. When the platen frame 82 jected image by the platen. To achieve this result the platen | 13 is tilted, with respect to the Voo is in the position shown in Fig. 10, which is the lower case printing position, the shield |95, upon record material printed upon, suiiiciently to clear oscillation of lever .202, will not be raised sufii >the light cone. The peripheral surface of the ciently to b_e interposed between the type face | 91 platen |13, upon which printing is eil'ected, is and the platen |13. ’Howeven when the platen slightly beveled so that in one of the shift posi frame 82 is in the upper case printing position ltions of the platen the peripheral surface of the with the platen |13 in printing relation with the platen will be parallel to the record material. In upper case type face |96, the shield |95 will, upon the present embodiment the peripheral surface reciprocation, be raised so as to become inter of the platen |13 is parallel to the record strip posed between the lower case type face |91 and when the platen frame 82 has been shifted to the upper case position as indicated in Fig. 10 by the 70 the record material, thus preventing any ink which has accumulated on the type face |91 from dotted line |94 of the platen |13. smudging the record material. To compensate for this arrangement of the As illustrated in Figs. 10, 11 and 12, there is platen |13', the type faces on the type bar |49 are provided a platen rotator for automatically chang arranged as shown in Fig. 17. Moreover, this 'arrangement of type faces in co-operation with 3.75 ing the printing point of the platen |13 in re sponse to each carriage return operation. As 12 l1 therein, so that when the carriage return signal is received by the printer the carriage is freed in the manner described in the aforementioned Patent 1,904,164, and the carriage return opera tion is eiîected through the release of the energy previously described, the platen |13 spaces with 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 returned rapidly with the carriage |42 to the be ginning-of-line position.V In contact with the platen |13 at a point opposite to the printing point is a closely wound coiled spring 200 which isconnected at its ends to the side frame mem bers of the platen supporting frame 82, in such a manner that the platen |13 is caused to rotate as it advances duringcharacter spacing. More over, upon the rapid return movement of the platen |13 (under the influence of the carriage return spring |50) during the performance of the carriage return function, _the platen |13 will, owing to the combined `sliding and rolling rela tion with the yieldable spring member 200, ro tate incommensurately, thus causing the same printing point of the platen to be presented to the type bars a minimum number of times. In stored up in the return mechanisms |50 and 233. In the embodiment shown in Figs. 8 and 9, the return of the carriage |42 and the counterweight 2 I1 is illustrated as effected by two return mech anisms, the return mechanism |50 acting directly upon the type carriage |42 and the return mech anism 233 acting >directly upon the counterweight 2I1. The two return mechanisms co-operat'e to facilitate the return of both devices. 1f desired, 15 a single return mechanism may be employed by providing a return spring mechanism of suñicient strength to return both devices. In this event, the spring return Vmechanism may be located either at the position shown by the return mech 20 anism |50 or by the return mechanism 233. The carriage return mechanism |50 is provided with a dashpot buffer mechanism as is shown and de other Words, through the instrumentality of the platen rotator 200, the platenY |13 is controlled scribed in the aforementioned Patent 1,904,164. The counterweight return mechanism is simi in such manner as to reduce to a minimum .the larly provided with a buffer mechanism. This 25 number of times anyparticular printing point buiîer mechanism comprises a dashpot 235 suit on the platen is impinged upon, thereby reducing ably mounted in the plate 236 secured to frame to ~a minimum the wear at any given point and I5. Pivotally supported at 231 on bracket 240 hence prolonging the life of the platen. In lieu and properly positioned with respect to buffer 235 of the coiled spring 200, a taut wire or cord can, of course, be used. . 30 is a buffer lever 236. The rounded end of lever In accordance with the present invention, the printing apparatus used in combination with the projection system is of such structure and ar rangement that it is not affected by change in physical position of the assembly as a whole with respect to gravity. Specifically, a counterweight is provided which is associated with the movable 238 nts into a notched portion of the plunger 239 of the buffer 235 (Fig. 18). End 24| of the plunger 239 is adapted to receive the blow from the counterweight 2|1, said end 24| being receiv able in the'counterbore 242 in the counterweight 231. The counterbore 242 is indicated in the present embodiment for structural purposes only and is not an essential element of the structure. type carriage |42 so 4as to render the movement of the type carriage |42 independent of the force of gravity, and to assist the carriage return spring in uniformly moving the type carriage in any The resistance of pneumatic buffer 235 is varied by means of adjustable ports, inV a well-known manner. A spring 243 tends to rotate lever 238 physical position of the printer. As previously described, the type carriage |42 about pivot 231 to restore the buiîer mechanism to its operative position.` The present invention also contemplates the is movably supported on tracks |45 and |46, and after being operated upon by the spacing mech anism, the carriage |42 is returnable to the be ginning-of-line position by the carriage return spring mechanism |50. Having reference to Fig. 8, the type carriage |42 has secured thereto a bar 209 to the center of which is secured a stud 2|| on which is pivoted a har 2|2. A strap 2|3 is secured to end 2|4 of bar 2|2, and extends around an idler roller 2|5 and is secured at 2|6 to a counterweight 2|1. Roller 2151s rotatably in a counterclockwise direction (Figs. 8 and 9) projection of predetermined message matter or other information of a iixed nature by providing a stereopticon slide, as illustrated in Figs. 15 and 16, which is readily insertable into the ñeld of projection. The stereopticon frame 21| com prises a plate having integral flanges 212 and 213, which are conformed at their upper ends with hook portions 214 and 215, respectively, which embrace guide rodk |I3. Flange 213 is provided at its lower end with an extension 216 which bears supported on a bar 2|8 suitably positioned in the 55 against guide rod I I2 (Fig. 16) , thereby serving to frame I5. Secured to end 2I9 of bar 2I2 is a steady the frame 21| against oscillation and si strap 22| which extends around an idler roller multaneously to hold the frame 21| in the proper 222 _and is fastened at 223 to the counterweight vertical plane coincident with the ñeld of pro 2|1. Idler roller 222 is rotatably mounted on thejection. Frame 21| is readily insertable in the bar 2 | 8. Counterweight 2 | 1 is provided with roll projector by means of the handle portion 211 (as ers 224 and 225 (Fig. 9) which roll on upper shown in Figs, 15 and 16, for example). Frame rail 226, and rollers 221 and 228 which roll on 21| is also provided with an aperture 210 of a lower rail 229. Rails 226 and 229 are appropri size determined by the area of the projection ately supported in theframe. I5. Secured at 23| 65 field, so that a stereopticon slide of. suitable di to the counterweight 2 I 1 is astrap 232 of a spring mensions may be placed thereover. The means return mechanism 233 comparable to the carriage return spring mechanism |50. The spring re for supporting and holding the stereopticon slide comprises a pair of flanges 218 and 219 integra-l turn mechanism 233 is mounted on a bracket 234 with _the frame 21| at the bottom edge thereof, secured to the frame I5. , and a retainer comprising aspring clip 28| pivot As the carriage |42 advances step by step in 70 ally secured to the frame 21| and properly spaced response to the spacing mechanism, the carriage therefrom by a spacer 282. Thus, to insert a return spring mechanism |50 is wound up and stereopticon slide, the spring clip 28| is swung energy is stored therein in readiness to return the aroundits pivot to its horizontal position, and the ` carriage. At the same time, the carriage return s 218 and 219; and mechanism 233 is also wound up to store energy 15 slide is mounted on the flanges 2,405,173 14 after pressing the slide lightly against the frame housing and condensing lens system supported on 21|, the spring clip 28| is again swung back to the position shown in Figs. 15 and 16, thereby 4 said framework, a.telegraph receiver mounted in said framework in co-operative relationship with serving to retain the slide in place. It is understood that the features of the pres C21 said lamp housing and lens system, a web direct ing means so arranged with respect to said re ent invention are not to be limited to the speciñc ceiver and lens system as to provide a vertical forms described herein, but embrace all forms lprojection ñeld, recording means in said receiver which come within the scope of equivalency of the appended claims. for producing lines of printing on said web in said projection ñeld, means for case shifting said web What is claimed is: 10 in said projection ñeld to facilitate recordation of 1. In combination, a printing device having a upper and lower case characters thereon, means carriage movable to form character spaces, means for moving said web so as to direct said lines of for directing record material through said device printing upwardly across said projection field, comprising means for guiding said material in a vertical plane above and adjacent to said car 15 mirrors and an objective lens co-operating with each other so as to produce upon a screen an riage, means comprising a projection system for projecting onto a screen images of the characters image moving thereacross in correspondence with the movement of the web through said projection ñeld, and overcentering means effective inde ing positive stop elements and overcentering 20 pendently after a predetermined initial operation of said case shifting means to accelerate shifting means operable therebetween to accelerate shift produced on said record material, means for case shifting said guiding means, and means compris ing movement of said guiding means independ ently of said case shifting means to minimize the optical eiîect of said shifting movement upon the image. 2. In combination, a printing device having a carriage movable to form character spaces, means for drawing record material through said device comprising a pulling device disposed beyond the exit end of a vertical projection ñeld located im 30 mediately above the printing point and an inter movement of said web in said projection ñeld to minimize the optical eiTect of said shifting move ment upon the image. 6. In a projection system, a framework, a lamp housing and condensing lens system supported on said framework, a telegraph receiver mounted in said framework in cooperative relationship with said lamp housing and lens system, a web direct ing means s0 arranged with respect to said re ceiver and lens system as to provide a vertical mittently operable delivery means positioned in projection field, recording means responsive to positioned between said pulling device and said delivery means for sluiting said record material said web so as to direct said lines of printing up code signals including a type carriage and a advance of said projection ñeld, means compris platen movable therewith to produce lines of ing a projection system for projecting onto a screen images of the characters produced on said 35 printing on said web in said projection ñeld, platen shift means, means having a slotted artic record material in said projection ñeld, means ulation with said shift means, means for moving wardly across said projection ñeld, mirrors and for recording upper and lower case characters thereon, and overcentering means to accelerate 40 an objective lens mutually co-operative so as to produce upon a screen an image moving there shifting movement of said shifting means to min across in correspondence with the movement of imize the optical effect of said shifting move the web through said projection ñeld, and over ment upon the image. 3. In combination, a printing device having a type carriage movable to form character spaces 45 and a platen movable with said carriage, means for drawing a web through said device comprising 7. In combination, a printing deviceV having a carriage -movable to form character spaces, a a pulling device disposed beyond the exit end of a vertical projection ñeld located `immediately above and including said platen and delivery 50 platen movable with said carriage, platen means positioned in advance of said platen, means comprising a projection system for projecting onto a screen images of the characters produced on said web, means for case shifting the web in said projection ñeld, and overcentering means ef fective to accelerate shifting movement of said web to minimize the optical effect of said shifting means upon the image. 4. In combination, a printing device, means for drawing a web through said device comprising a pulling device disposed beyond the exit end of a 60 vertical projection ñeld located immediately above and including the printing point and deliv 8. In combination, a printing device having a ery means positioned in advance of said projec tion field, means comprising a projection system 65 carriage movable to form character spaces, means for directing record material through said device for projecting onto a screen images of the char acters produced on said web in said projection ñeld, means positioned between said pulling de vice and said delivery means for shifting said web for recording upper and lower case characters thereon, and overcentering means to accelerate shifting movement of said shifting means to min imize the optical effect of said shifting move ment upon the image. 5. In a projection system, a framework, a lamp 75 ' ‘ guiding said material in a and adjacent to said car riage, means comprising a projection system for projecting onto a screen images of the characters produced on said record material, means for case shifting said guiding means, and overcentering means to accelerate shifting movement of said guiding means to minimize the optical effect of said shifting movement upon the image. WALTER J. ZENNER.