US2403270A - Projector for page printers - Google Patents

Description

July2,1946. w. H. mm 2,403,270

' PROJECTOR FOR PAGE PRINTERS Original Filed July 17, 1940 2 Sheets-Sheet l INVENTOR I4 23 II WILLIAM H. EDDY vw a 1946. H; E Y 2,403,270

PROJECTOR FOR PAGE PRINTERS Original Filed July 17, 1940 2 Sheets-Sheet 2 FIG. 4 I23 48 I24 71/! l x v n9 '0: V k D IZI 4 2 70,2

H3 7 H5 I I29 I we ll! n2 11 I47 5 g I NVENTOR WILLIAM H. EDDY A ORNEY Patented July 2, 1946 UNITED STATES PATENT 'GFFICE PROJECTOR FOR PAGE PRINTERS William H. Eddy, Downers Grove, Ill., asslgnor to Teletype Corporation, Chicago, Ill.,

ration of Delaware Original application July 11, 1940, Serial No.

346,002. Divided and this application September 18, 1941, Serial No. 411,374

14 Claims. 1

The present invention relates to printing telegraph apparatus and more particularly to page printers for use in projection systems.

This application is a division of application Serial No. 346,002, filed July 17, 1940. l

' 'a page printer, of the type shown in U. S. Patent No. 1,904,164, designed to give upon a screen a running account of received message matter, through the instrumentality of an optical system comprising an arrangement of inclined mirrors so'that the printer and lamp'housing may be located at the lower part of a suitable cabinet, and the screen formed as a part of the upper forward wall of the cabinet and positioned above the printer compartment.

Specifically, the page printer isv 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 condensing lenses is positionable so as to embrace within the field of projection the last line of printing, and also to include eight or ten printed lines. Printing is effected on a Cellophane strip and the image of the record produced thereon is projected through the optical system onto the screen. The Cellophane web or strip is drawn upwardly 1 through the projection field. The characters on the section of the web in theprojection field are so arranged as toform horizontal lines one above the other, and the images ofsaid horizontal lines of characters areprojected on th screen. The

horizontal lines 'of images on the screen move upwardly across the screen similar to the movement of the web through the projection field.

The foregoing and other objects and features of the invention will appear from the following detailed description taken in conjunction accompanying drawings, in which, I I

Fig. -1 is a cross-sectional view of the printerprojector according to the present invention;

with the Fig. 5 is a perspective view of the printer impact equalizing mechanism according to the present invention; and

Fig. Sis an enlarged side view ofa type bar head.

Having reference to the drawings in which like reference characters indicate similar parts throughout the several views, the combination page printing and projecting apparatus according, to the present invention is housedlin a cabinet, indicated generally by the numeral H, which is provided in the lower portion thereof with a door (not shown), and in the upper portion with a translucent projector screen l3. Secured to the floor of cabinet H are two angle iron rails l4 (only one of which is shown in Fig. 1) which provide atrack for the frame l5 which supports the page printing apparatus, indicated generally by the numeral IS, the lamp housing l1, and the optical arrangement represented generally by condensing lenses l8, small mirror I 9 and ob jective lens 2|. Wheels 22 are journaled to the bottom side members of the frame t5 and c0- .operate in rolling relation with rails l4,-whlch are provided with indentations 23 into which the.

wheels 22 are admitted when the frame l5,.in assuming its fully inserted position in the cabinet ll, rests upon spacing bosses 25. In the fully inserted position, the framel5 is anchored I by means of bolts 30 to the base of the cabinet ll. With this arrangement, the frame is easily insertable in the cabinet H by means of rollers 22, and moreoveris'adapted, when the proper position has been assumed, to rest upon spacers 25 and to be anchored to the cabinet by bolts.

At each side of frame l5 and disposed at the rear thereof are pivot supports 24 for a frame 28 which carries the lamp housing I! and condenser lenses I 8. A bar 20 (Fig. 4) 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 to Fig. 2 is a cross-sectional view of the printer showing a printing impact equalizing mechanism;

Fig. 3 is an enlarged cross-sectional p nter platen and platen frame;

Fig'. 4 is an enlarged side View and partial se'ction of the printermechanism and associated view of the lamp housing and part of the optical arrangement;

facilitate removal of ,the printer for servicing, is held inits upward position by the engagement of said hooked portion with a stud,. in well-known manner, thebai- 20 tius serving as'abrace or support. The lamp housing I! comprises an outer casing 21 (Fig. 1) which is secured toa plate .28 fastened to a crossbar 29 of the frame 28.

Contained within the lamp housing l1 .and suitably spaced from the outer. casing '21 thereof is abaflle plate 3| which rests upon the bottom 01' the housing I! and extendsupwardly toa point closetothet'op, as illustrated in Fig. 1. The bot tom of the housing I! is provided,- between the outer casing 21 and the baflle plate 9|,with apertures' 92. This construction permits the flow of is a baifle plate 99 (Fig. l) of substantially the same area asthe opening 99. Lamp 91 is ad- Justably clamped to a bracket 99, which in turn is adjustably supported by the floor of the bouting II. -A reflector 9| is spring clamped by a carrier 92 which is adjustably supported, through the instrumentality of a rod 99 and the enlarged mounting holes for plates 95, by the outer casing 21 of the lamp housing I].

In the embodiment of the invention shown in thedrawings, a condensing lens system I9, comprising two piano-convex lenses and one convexo-convex lens, is provided, these lenses being suitably clamped by clamps 99 to plates 29, 99, and 91 which are appropriately separated by spacing posts (not shown). Plate 91 is secured along its top edge to a crossbar 99 '(Fig. 1) of frame 29. Plates 29, 99.- and 91 are suitably aper-. tured to provide a field of projection of such area as to present upon the screen I9 a predetermined number of lines of printing produced on the record strip or web 99 of transparent material.

As previously mentioned, the optical systemof the present invention includes a mirror I9 and an objective lens 2|. The optical system also includes a mirror 5| supported in the upper part of the cabinet I I, and through this system the image is projected upon the screen I9. The

, convection currents. between. the outer casing 21 The web 99 is then directed over a roller 9| to which is fixed a ratchet wheel92, the ratchet wheel and roller being carried on a shaft 99 Journaled in the plates 99 secured to side frames '19 and I9. Co-operating 'with the roller 9| is a pressure roller 99 which is carried, on a standard 99 secured to a rock shaft 91. Pressure roller 99 is drawn into pressing relation with roller 9| by means of a spring 99. Secured to rock shaft 91 and located in juxtaposition to plate 99 is a pressure roller release lever 99. Co-operating with pressure roller 9| and maintaining this condition until lever 99 is again released from the shoulder I9| to permit spring 99 to bring roller 99 again into pressing relation with roller 9|. Associated with the ratchet wheel 92 is a pawl member I92 (Fig. 1) which is pivoted to a bell mirror I9 is adjustably pivoted on a pair of 7 2| facilitate the proper positionment of the image on the screen.

- Having reference to Fig. 1 a page printer of the type'shown in U. S. Patent No. 1,904,199-is mounted in'the frame I9. The printer, indicated generally as I9, has been modified in certain respects to adapt it for use with the projector of the present invention. prises the side frames I9 and. 1.9 (Fig. 4) to which is pivoted at 9| a platenframe indicated generally as 92. The usual cylindrical form of-platen has been dispensed with. in the present embodiment of the invention and has been substituted by the disc'form of platen I19 shown in Figs. 3 and 4, and which will be hereinafter described.

- To provide a running account of the message.

printed on the page material, a delivery mech is" provided which comprises a means for permitting the record material to escape from the pply roll, suitable guides, and a web pulling means whereby the page material is advanced "through the printing zone. 7 99 in being withdrawn from the roll 99 is directed over-a slackbar which is pivoted at 99 and is norm'allybiased clockwise by a spring 99 tomaintain the page materialflor Cellophane'web' taut between the roll 99 and a flanged cylindrical guide 91 carried on ashaft 99. iournaled in 99 dependingfrom side frames 'I9 and .19.

The page material I The page printer comcrank lever I99 carried on a pivot shaft I99. The depending arm of bell crank I99 is pivoted to one end of a push rod I99, the other end of which .is shouldered. to co-operate with a function ball I I99 in the manner shown in the aforementioned Patent No. 1,904,164. Thus, in response to a predetermined selection a function lever. similar to function lever I9'I shown in Fig. 4 1's selected to raise the free end of push bar I99 upwardly into the path of the function bail blade I99. Then,

when the push .rod I99 is actuated leftwardly by the function bail I99, clockwise rotation is imported to hell crank lever I99 to impart in turn,

downward movement to pawl I92. In-this manner, the ratchet-wheel 92 is rotated clockwise one step. which, through the oo-operation of pressure rollers 9I- and 99, acts in oil-operation with a web pulling device to deliver? a predetermined amount of record material 99 from the supply roll 99 to the printing zone and the projection area.

The record material 99 is'brought to the printing position by means of a pulling or drawing mechanism now to be described; The record material 99 as it leaves roller 9| is directed around guide rods I99, III, and H2. These guide rods may take the form of a fixed rod carrying guide rollers thereon to eliminate friction. From the guide rod 2 the record material 99 is di-,

rected vertically through the printing zone and projection areato a guide rod 9 carried by a U-shaped shifting frame member "9 (Figs. 1 and 4) pivotally carried on pivots H9 and H9 suitably iournaled in-the frame II; The page material 99 is then directed around a guide rod III carried in supports 9 (Fig.4) depending. from bars II9 secured to angle iron-cross bars |2I and I22 of frame I9. From thence. the p e material is directed around a spindle I29 nxed to a shaft I29 iournaled in standards I29 supp0rted on said b'ars'lll.

Shaft m is interconnected through a friction clutch .(not shown) to a pulley I29. Continuous counterclockwise rotation (as viewed in Fig. 4) is imparted to pulley I29 through the instrumen- 'tality of a belt connected to a pulley in .fixed to the main operating shaft I92 of the page printing apparatus shown in PatentNo'. 1,994.- 194. Shaft I92 carries a sear-I99 which meshes with a pinion gear I99 fixed to shaft I99 of a moto'r I99 (Fig. 1). Motor I99, therefore, through gears I99 and I99, shaft; I92. pulleylfl, and belt Ramparts continuous rotation to pulley.,..|29.'

which, through the friction clutch m, imparts a constant torque through shaft I 24 tothe spindle I23. With thisarrangement the page material taut condition between the r 49 is maintained in a spindle I23 and the roller 5i. Thus; when the ratchet 921s rotated one step a predetermined amount of the, page material 45 is delivered from the supply roller 83, which material is immediately taken up by the spindle I23 to preserve the taut condition of the page material.

As disclosed in the aforementioned Patent No. 1,904,164, the page printer I6 is controlled telegraphically by a selector magnet I31. This is connected in a signal line (not shown) on which are impressed code combinations of signalling impulses. The code signals control, through a selector magnet I31 of asword and T-type selector (not here shown, but illustrated and described in said patent), a series of selector vanes I38 which, in turn, controls through bell cranks (shown in said patent), a set of curved code bars I (Fig. 4). Code bars I41 and said bell cranks are supported on a movable type carriage, indicated generally by thehumeral I42, which is Type carriage I42 is also providedtwith a, spacing rack I 52 which co-operates with' a spacing mechanism (not shown) similar to that illustrated in Patent No. 1,904,164, to'control the movement of type carriage I42 to form character spaces, tending in this movement to wind up a carriage return spring mechanism (not shown). Upon receipt of the carriage return signal, a function lever (similar to lever I01) is selected and the carriage return mechanism is actuated in the manner described in the aforementioned Patent No. 1,904,164. The carriage return mechanism is thereupon permitted, due to the energy stored therein, to return the type carriage I42 to its'normal or beginning-of-line position. I

A pull bar bail I53 is mounted in the type carriage I42 and is ried on the bottom side thereof on a stud I55. Roller I54 operates between a pair of blades J55 and I51 of a main printing bail I55 so, that ball I53 can be reciprocated by bail I58 in any character spacing position of the type carriage I42. Fastened 'to-the printing bail I55 is one end of a printing spring I5 9, the other end of which is connected to a printing blow adjustment means as shown in Patent No. 1,904,164. -Bail I58 is mounted on a shaft I5I on whichis also carried a printing bail actuator I 52 which co-operates with a printing cam I53. Actuator I52 carries at the end of its upper arm a stud I54 whichhas abutting relation only with printing bail I58 and Is not permanently connected thereto, which-is to permit spring printing. Printing bail I55 is'also provided with a pair of arms I55 which carry a function lever bail I50. Also carried on. shaft I5I is a function bail comprisingarms I55, I58, and m. Arm 10s is provided with a follower roller which co-operates with a function bail cam I58, and arm I51 supports on its end the function bail alade I08.

Associated'with the selectorfvanes I38 are a olurality of function levers I01 mounted on pivot rod in and provided withindividual springs I13 provided with a roller I54 carwhich tend. to rotate the function levers clockwise into registry with the selector-vanes I38; The function levers I01 are normally-held out of engagement with the selector vanes I38 by means of the rod I55 ofthe function lever bail- As previously mentioned, the. platen frame 82 pivotally supported on pivots, in side frames 18 and 10. The, platen comprises a. circular. disc I13 rotatably mounted, on 'acarriage I14 which is slidable on rodsI1-5 and I15 carried by platen frame 82. Platen carriage I14 is connected to the type carriage, as will be presently described,

so as to be movable therewith, the effective printing edge of the platen I13 being locatedcoincident with the printing point or zone determined by the path of operation'of the type bar I45.

The platen frame 82 is adapted to be rocked from the letters or unshift position to the "figures" or shift position in the manner fully set forth in the aforementioned Patent No. 1,904,164.

Briefly, the side frame of the platen frame 82(as shown in Fig. 4) is provided with a lug I11 which operates between two adjustable stop I18 and I19. Adjacent to lug I11 there is pivoted to the side frame of the platen frame 82 on pivot I81,

the upper end of a link I82, the lower end of which is pivoted to the horizontal arm of a bell crank lever I83 pivotally mounted at I84. To the lower end of the depending arm of bell crank I83 is pivoted a push bar I 85, thei'ree'e'nd of which overlies=a rearwardly directed arm of the function lever I01. Push bar I85 is also provided with a shoulder I85 which co-operates with the function lever bail blade I08. The platen frame 85'and platen I13 are shown in the "letters or unshi'ft position, with the stop lug I11 against the upper stop screw I15. This condition is achieved when the function ball blade I 08 has operated upon the shoulder I85 to move the push bar I 85 leftwardly to rotate the bell crank I83 clockwise, thus raising the link I52 to cause the platen frame 82 to rock clockwise.

A correspondingly similar construction is .pro-

' vlded for the figures or shift mechanism.

That is, a shift function lever similar to lever I01, is provided which, when selected, is caused to rotate clockwise to bring its rearwardly extending arm into operation to raise apush bar; similar to bar I85, into the path of the function bail blade I08 which, when it is permitted to operate leftwardly (as viewed in Fig. 4), will cause abell crank, similar to bell crank l83,,to pull down a link similar to link I52 to rock the platen frame 82 counterclockwise to bring its stop I11 against the" lower stop screw- I15. The platen frame 82 is maintained in its shift or unshift position by a spring actuated detent member I81 acting on a detent roller I85.

In Fig. 3 is'illustrated the manner in which the platen carriage I14 is connected to the type carriage I42 so as to be movable therewith. As previously mentioned,v the I platen carriage I14 is slidably supported on rods I15 and I15. Carriage I14 is provided with an eccentric stud I en- Saged by the forked end or extremity of a. bar I85, the other end of which is secured to a member Isl which is secured by screws I52 to. the type carriage I42. As more fully described in the parent application, the circular platen I13 is rotatably mounted on the platencarriage I14 by I meansof an eccentric means I93. By meansof the adjustment I53, the platen I13 is adjustable toward and away from the record material to vary the clearance therebetween. "A compensatin: adjustment is alsov provided for the platen 113, i

An important feature of the present invention is the provision of a. platen' so positioned as to reduce to a minimum the obstruction of the projected image by the platen. To achieve this result the platen I13 is tilted with respect to the record material printed upon, sufficiently to clear thelight cone. The peripheral surface of the platen I19, upon which printing is effected, is slightly beveled so that in one of the shift positions of the platen the peripheral surface of the platen will be parallel to the record material. In the present embodiment the peripheralsu-rface of the platen I19 is parallel to the record strip when the platen frame "has been shifted to the upper case position, as indicated inFig. 3, by the dotted line I94 of the platen I13.

for a printing operation, the ribbon will be raised to printingposition due to the counterclockwise movement imparted to the 1ever292 by the bail I59. When the platen frame 92 is in the position shown in Fig. 3, which is the lower case printgng position, the shield I95, upon oscillation of ever 292, will not be raised sufficiently to be interposed between the type face I91 and the platen I19. However, when the platen frame 92 is in the upper case printing position with the platen I19 in printing relation with the upper case. type face I99, the shield I95 will, upon reciprocation, be raised so as to become interposed between the lower case type face I91 and the record material, thus preventing any ink which has accumulated on the type face I91 from smudging the To compensate for thi arrangement of the platen I19, the type faces on the type bar I49 are arranged as shown in Fig. 6. Moreover, this arrangement of type faces in cooperation with a shield I95 (Fig. 9) serves (as will presently appear) to prevent smudging during the printing operation. As is well known, the type bar I49 is provided with an upper case type face I95 and a lower case type face I91. However, according to the present embodiment the lower case type face I91 is provided with a slope corresponding to the slope of the periphery of the platen I13 when in the lower case position. The dimension 291 of the upper case type I95 is arranged to be slightly less than the minimum height 2! of'the lower case type I91. When printing. is effected in-the lower case position, the type face I95 being lower than the type face I91, will not touch the record material and hence no smudging of the printed record will occur.

' When printing is effected in the upper case position, means isprovided for preventing the lower case type face'I91 from coming into direct contact with the surface of the record material. To achieve this result a shield I95 is provided which-is adapted to be interposed between the type face 191 and the platen I13 when printing is being effected in the upper case position.

Shield I95 is secured to the ribbon oscillating' member I99, which as describedin the aforemen tioned Patent'No. 1,904,164, oscillates the inking v ribbon into and out of the path of the type faces during the printing operation. The'ribbon oscillator I99 is pivotally articulated to' arm 29I of a lever 202 which, in turn, is pivoted at 299 to a lever 294 pivoted at 229 to the type carriage I42. Lever 294 is arranged to carry a roller 295 which rides on the bottom side of a rail 205 mounted on the platen frame 92, as disclosed in the aforementioned Patent No, 1,904,164. Roller 295 is pressed against the rail 295 by a spring (not shown), so that when the platen frame 92 is rocked between the shift and unshift positions, roller 205 will constantly contact with said rail 295, and lever 292 will be'reciprocated therewith. I

The depending arm 299 of the lever 292 is operably associated with the pull bar bail I59 (Fig. 1) so that the reciprocative motion of bail I59 will cause the oscillation of the lever 292 about pivot 299, whether the platen frame 92 is in the shift or the unshift position. Thus, when the bail I59 is in its normal position (the leftward position as shown in Fig. 4),,the lever 202 will hold the inking ribbon, through the instrumentality of the ribbon guide (not shown) located at the upper extremity of member I99 (Fig. 3), in its down:

record material.

Normally, in. making a printed record the impact of the type faces against the platen in the lower caseposition is slightly greater than it is in the upper case position of type faces I99, due to the fact that the lower case type faces I91 are closer to the type bar pivot I5I than are the upper case type faces I95. In an ordinary printed record the slight difference in density of printing in each case is not discernible. However, due to the characteristics of the transparent web upon which printing is effected for projection, this difference of density of printing is more noticeable. To compensate for this variation in density of printing, the present invention provides means for equalizing the printing impact of the lower and upper case type faces automatically, so that printing of equal density is produced upon the record material. The variation in density of printing is more noticeable when printing is effected upon transparent record material, such as is used in printer-projector apparatus of the type to which the present invention is applied.

Having reference to Figs. 2 and 5, a lever 245 is pivoted at 245 to a plate 241 which is adjustably mounted by means of sIot-and-screw adjusting means to bracket 248 carried by printer frame 19. A spring 249 extends between the upper end of lever 245 and a spring post 25I carried on printing bail I59. The lower end of lever 245 is provided with a laterally extending 'portion 252 which co-operates with a depending projection 259 on the upper case shift push bar 254. Lower case and upper case push bars I95 and 254, respectively, are articulated to a platen shift I Push bar. 254 is maintained in operative relation with control lever 255 by a spring 251 extending from projection 259 on bar 254 to a projection 259 on lever 255. Similarly, push rod I95 is maintained in operative relation with control lever 255 by a spring 259 extending from projection 25I on bar I95 to projection 252 on lever 255.

To print a character, the code signal corresponding thereto is received by the selector magnet I91 (Fig. 4) which, in turn, controls, through selector vanes I99 and the aforementioned bell crank levers, the setting of code bars I. They selector cam drum associated with selector ma .net' I91 controls (as described in Patent No.

1,904,164) the initiation of rotation of operatin shaft I92 which carries the printing cam I59 and the function cam I99. In proper timed relation with the setting of code bars I, the printing bail I13 to effect printing.

The power for effecting the printing operation is supplied by the printing spring I59 and, as previously mentioned, a means is provided for automatically varying the power supplied by said spring'in accordance with the case shift condition of the printer. It has been found upon ma nification of the printed record incident to projection upon a screen, that the difference in the distances of the upper and,lower type faces from the type bar pivot causes a difference in the weight of printing which indicates a difference in the printing impact of said type faces. To equalizethe printing impact so that it is substantially the same in both upper and lower case, the spring 249 is provided, which in the-lower case position is caused to resist the movement of the printing spring I 59, thereby reducing the impact of the lower case type face against the platen sufficient- 1y to equal the corresponding impact of the upper case type face. r

Upon receipt of thelowercase or letters shift signal, the "letters shift function lever II" is selected and operated in the manner described in Patent No. 1,904,164 to raise push bar I85 to bring shoulder I88 thereon into the path of function lever bail blade I88 which, when operated, urges the range of equivalency are to be embraced within the scope of the appended claims. What is claimed is:

1. In a printing apparatus, a printing bail, movable printing means slidably articulated to said printing bail, power means for operating said printing bail, and other power means rendered operative automatically as an incident of a pre determined function of the apparatus for alter- 1 ing the effectiveness of said first mentioned power means.

2. In a printing apparatus, a printing bail, movable printing means slidably articulated to said printing bail, case shift-mechanism, power means for operating said printing bail, and means operative automatically undercontrol of said case shift mechanism for altering the effectiveness of said power means.

3. In aprinting apparatus, a printing bail,

movable printing means slidably'articulated to" said printing bail, case shift mechanism, spring means for operating said printing bail, and further spring means operative under control of said case shift mechanism for altering the effectiveness of said firstmentioned spring means.

4, In a printing apparatus, a printing bail,

. movable printing means slidably articulated to push bar I85 leftwardly (as viewed in Fig. 5) to impart clockwise rotation to controllever 255. Le-

ver 255. besides effecting the shift of the platen frame 82 to the letters case position (as indicated in Figs. 2 and 4), causes the push bar, 254

.tobe moved rightwardly, and in so doing, the

projection 253 thereon engages the lateral portion 252 of lever 245, thereby imparting counterclockwise movement to lever 245 to stretch the spring 249, thus increasing the tension therein.-

Now, when the printing bail I58 is operated in response to subsequent character code signals, the pull of the printing spring I59 will be resisted by the pull of spring 249, thereby reducing the force of the printing blow, so that the -impact of printing is equal in both upper and lower case.

When the upper case or figures shift signal is received, the figures shift function lever I88 is selected and operated to bring shoulder 288 of push bar 254 into the path of function lever bail blade I88, which, when operated, urges push bar 254 leftwardly to impart counterclockwise rotation to lever 255, which movement will cause,

' through bell crank lever I88 and link I82, the

tive, since lever 245 and spring 249 are now free to move with printing bail I58, .and no resistance is oflered by spring 249 to the printing spring I59. A spring 2640! very light tension extending from lever 245 to spring post 285 on bracket 248 is provided to take up the play of the mechanism Although a specific'embodimen't of the invention has been shown herein, it will be understood that the invention is capable of modification, and it is intended that all forms which come within said printingbail, case shift mechanism, spring means for operating said printing bail, and further spring means operative automatically under control of said case shift mechanism for altering the effectiveness of'said first mentioned spring means.

5. In a printing apparatus, a printing bail,

printing means articulated-to said printing bail, case shift mechanism, spring means for operating said printing bail, and further spring means operative under control of said'case shift mechani-sm for altering the effectiveness of said firstmentioned spring means.

6. In a printing .apparatus, a ball, movable recording means slidably articulated to said bail,

. said means comprisingtwo groups of recording I upon aweb, power means for operating said means, and spring restraining means operative automatically under the control of said first mentioned means for altering the effectiveness of said spring means.

8. In a recorder, a plurality of type bars, a platen, means responsive to certain selective operations of said recorder to effect relative ease shifting movement between said type bars and said platen, power means for operating said means, spring means for controlling the coaction between said type barsand said platen to produce a printed record on a web, and spring restraining meansresponsive to said selective oper- 7 0 ations for altering the effectiveness of said spring means.

work, a type carriage movable with respect to said stationary framework, a printing bail in said stationary frame work, slidableconnecting a 11 means between said carriage and said ball to effect recording operations, spring loaded opera ating means for said printing bail and spring restraining means operative automatically as an incident of a predetermined function of said recorder for'altering the effectiveness of said operatlng means.

10. In a printing apparatus, a printing bail, printing means articulated to said printing bail; power means for operating said printing bail,

' selective means effective to apply a predetermined restraint upon said power means, and further selective means efiective to release said restraint.

I and said platen, power means for operating said means, spring means effective to apply apredetermined restraint upon said power means, and means efiective to release said restraint.

12. In aprinting apparatus, a platen, printing means co-operable with said platen, spring loaded operating means to cause said printing means to impart a predetermined impact upon said I 12 platen, and spring restraining means connected to said operating means and operable selectively to alter the effectiveness of said operating means.

13. In a printing apparatus, selectively controlled means, printing means controlled by said selectively controlled means, case shift mechanism also controlled by said selectively controlled means, and spring means variably operated by said case shift mechanism in response to prede- 7 termined operations of said case shift mechanism to alter the efiectiveness of said printing means.

14. In a printing apparatus, a printing bail,

printing means articulated to said printing bail,

- said selective elements, the control of said spring by said pivoted element is varied ,to alter the 1 effectiveness of said printing means.

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