US2182635A - Printing telegraph apparatus - Google Patents

Description

Dec. 5, 1939. H. L. KRUM Er Al. 2,182,635

PRINTING TELEGRAPH APARATUS FIG.2

FIG. 3

o 'ITORNEY.

CARL W. SWAN Dec. 5, 1939. H. 1 KRUM ET Al.,

PRINTING TELEGRAPH APPARATUS .w R vh R E 2. mxm m .t N.W e ELS O VD. M mRW A AL W' 4 J 7 O 9 l 6, v. a M d e l .1 F

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4 Sheets-Sheet 3 H. L. KRUM ET 'AL PRINTING TELEGRAPH APPARATUS Filed May 6, 1937 Dec. 5, 1939.

INVENTOR.

A TORNEY.

Dec. 5, 1939. H. L. KRUM ET AL 2,182,635

PRINTING TELEGRAPH APPARATUS Filed May 6, 1957 4 Sheets-Sheet 4 2 FIG. 9

INVENTOR. HOWARD L. KRUM CARL W. SWAN ATTORNEY.

FIG.

Fatented Dec. 5, 1939 UNITED STATES PRINTING TELEGRAPH APPARATUS Howard L. Krum, Kenilworth, and Carl W. Swan, Chicago, Ill., assignors to Teletype Corporation, Chicago, Ill., a corporation o! Delaware Application May 6, 1937, Serial No. 141,043

35 Claims. (Cl.1'7829) Ihe present invention relates to printing telegraph apparatus and particularly to a type wheel printer for recording characters in page form.

The principal object of the invention is to provide a page printer which is light in weight and readily portable and at the same time reliable and emcient in operation.

An important object is to provide a type wheel printer in which the chief operating characteristics are analogous to those inherent in certain extensively employed type bar printers, to render the former printers capable of operation in the same telegraph circuits with the latter printers for recording the same message in similar manner and perform the same functions.

Briefly, the apparatus according to the present invention employs a single magnet permutation code selector, the selections on which are transferred to a series of code bars, which selectively control a plurality of selectable drop bars or abutment members, which in turn cooperate with a corresponding plurality of stop arms helically arranged around and aixed to a rotatable cylindrical member. Each of the stop arms terminates in two steps or shoulders, so that each arm governs the positionment of two characters on a type wheel. The type wheel consists of a circular disc, having equally spaced radial slots, thus forming a series of radiating reeds, upon which the letters an and figures are arranged in a single row. The upper and lower case characters are arranged alternately, and mechanism is provided for shifting the type wheel angularly, or rotationally, relative to the axis of the supporting shaft, one-half a5 step, the distance between two successive characters in the same case being considered as one step.

A cylindrical platen is movable to effect character spacing, is rotated i'or line feeding, and is further controlled by character spacing and caro riage return mechanisms. Visible printing is attained bywithdrawing the type wheel from the platen, after printing, a substantial distance sufiicient to preclude obstruction of vision. The usual functions of suppressing spacing and printing during the performance of certain other functions (for example, case shift, carriage return, and line feed) are included.

The functions are performed by levers actuated from cams on the vertically disposed main shaft,

.50 after being conditioned for operation by drop bars in the selector mechanism. Ink is supplied to the character faces on the type wheel by means of an inking roller` to simplify the construction, but it is, of course, understood that ribbon feed and reversing mechanisms can readily be applied. In connection with the carriage return mechanism, spacing and retaining pawls, when withdrawn from engagement with the spacing rack, are latched into drawn position and remain latched until the carriage return operation is completed 5 and the next character is printed, whereupon they Fig. 3 is a cross-sectional detail of the code'bar 20 and selector member arrangement;

Fig. 4 is a side elevational view of the receiving apparatus according to the present invention;

Fig. 5 is an end view of the type wheel shaft with the type Wheel broken away to show the rela- 25 tive positions of the star Wheel and stop arms;

Fig. 6 is a fragmental perspective View of the anti-rebound device;

Fig. '1 is a top view of the receiving apparatus, with parts broken away, to illustrate various inter- )o nal mechanisms;

Fig. 8 is a fragmental plan view showing certain details not shown in Fig. 7;

Fig. 9 is a front elevational view, with parts removed, of the apparatus according to the pres- $5 ent invention; and

Fig. 10 is a fragmental cross-sectional view `of the taut wire pape'rtearing edge.

The receiving apparatus according to the present invention comprises essentially a printing unit 0 indicated generally by the numeral 2| mounted on a base portion indicated generally by the numeral 22. A pinion gear 23 is xed to the drive shaft 24 of a motor 25 and meshes with a gear 28 carried on a vertically disposed main shaft 29 (Fig. 4). 45 Shaft 29 has aixed thereto a collared member 3| and is supported therethrough by a supporting bracket 32. The shaft depends therefrom and is guided at its lower end by a bracket 33. Carried on shaft 29 is a sleeve member 34 on which are 50 carried, as also indicated in Fig. 4, a spacing cam 35, a. transfer cam 36, and a printing .cam 31. The functional mechanisms associated with these cams will be described hereinafter. p

A toothed or grab clutch, indicated generally as u 38, is carried on shaft 29, and is superposed above vsleeve 34 and comprises a driving portion 39 fixed to the shaft 29 and a driven portion 4| articulated by a tongue and groove connection 42 to the sleeve member 34. Driven portion 4| of the clutch 38 is normally urged upwardly by a coil spring 43, which movement is resisted by arm 44 of a release bail 45 pivotally carried on a bracket 46 aixed to the printer frame 41. Arm 44 cooperates with a cam portion 48 integral with the driven portion 4| of the clutch 38. As the release bail is rocked in a manner presently described, the arm 44 thereof will be actuated outwardly (counterclockwise as viewed in Fig. 1) out of engagement with cam portion 48, whereupon spring 43 will urge the driven portion 4| of clutch 38 upwardly into mesh with the driving portion 39 which is constantly rotating. Then, after a single revolution has been completed, arm 44, which has been returned into its position against the clutch portion 4| by a spring 49 (Fig. 1), the coaction between arm v4,4 and the cam portion 48 will cause the cammingout or disengagement of portion 4| from portion 39. Clutch 38 is referred to as a single revolution clutch. Shaft 29 extends above bearing 32land carries thereon a selector cam drum 5| and related/ elements. However, disposed between the cam drum 5| and the bracket 32 and aflixed to shaft 29 is a gear 52 which meshes with a gear 53 (Figs. 1 and 8) frictionally carried on an auxiliary shaft 54.

Fixed to the upper end of shaft 29 is' a disc (Fig. 4). Cam drum 5| is frictionally driven by shaft 29 through the instrumentality of friction discs 56 and 51. Friction disc 56 is compressed between disc 80 and ange 58 of cam drum 5|, and friction disc 51 is compressed between flange 59 of cam drum 5| and a disc 6| by a helical spring 62. By this means, cam drum 5| will rotate with shaft 29 except when it is arrested by the engagement of stop lug 63 integral with cam drum 5| and-a stop gate l|54.

Stop gate 64 is mounted on a pivot stud 65 secured to an adjustable plate 66 (Figs. 4 and 1) and its upper arm 61 is adapted to be engaged by a. latch 68. The latch 68 is pivoted in a journal block 69, and this journal block is in turn mounted on the adjusting plate 66. Plate 66 may be rotated about a pivot stud 1| by means of an orientation control device indicated generally by the numeral 12 and as described in Patent No. 2,082,511, granted June 1, 1937. As shown in Fig. 4, both the latch 68 and the stop gate 64 are carried on the adjusting plate 66 and are movable therewith. By means of this orientation adjustment, the position of arm 13 of stop gate 64 may be altered to obtain the best operating conditions of the selector, as described in said patent. Associated with latch 68 is a bell crank lever14 (Fig. 4) pivotally carried in a journal block 15 mounted on plate 16 of the orientation device. Associated withvthe vertical arm of bell crank 14 and carried in block 15 is a plunger 11 which, as shown in Fig. 7, cooperates with arm 18 of a selector lever 19. Latch 68 is normally biased in a clockwise direction (as viewed in Fig. 4) by a coil spring 8| so that it is normally brought into locking relation with arm 61 of stop gate 64 and simultaneously therewith bell crank 14 is maintained in its counterclockwise position and plunger 11 is in its retracted position. Thus when plunger 11 is depressed or urged rightwardly, as viewed in Fig. 4, by the action of selector lever 19 as will presently appear, bell crank 14 will be rocked clockwise and latch 68 will be rocked counterclockwise against the action of its spring 8| to effect the release of the selector cam drum 5| for rotation, which is effected by the pressure of stop lug 63 against arm 13 of the stop gate 64, which pressure, owing to the release of latch 68 from arm 61, will cause the stop gate 64 to be rotated against the action of its spring 82. When lug 63, in its rotation, escapes arm 13 of stop gate 64, the stop gate will be returned to its locked position in engagement with latch 68 by the action of spring 82, so vthat when lug 63 again reaches arm 13, it

will be arrested thereby due to the detention of y arm 61 by latch 68.

Having reference now to Fig. 7, the details of the selector mechanism actuated by the cam drum 5| will be described. The selector cam drum 5| is rotated at a speed substantially equivalent to the speed of code impulsing, and operating in conjunction therewith is a selector magnet 83 which may be connected either directly or indirectly (through a line relay, for example) to the signal line. Selector magnet 83 is carried on a bracket 84 ailixed to the printer frame, and associated with the selector magnet 83 lis the selector lever 19 pivoted at 85.. Selector lever 19 has a pole piece 86 which cooperates with the core 81 of the selector magnet 83, and is biased, upon deenergization of magnet 83, in a clockwise direction by a spring 88 distended between the pole piece 86 and a spring anchor arm 89. Upon energization of selector magnet 83 by the impression of marking current on the signal line, pole piece 88 will be attracted, causing selector lever 19 to be actuated in a counterclockwise direction against the tension of spring 88.

Selector lever 19 terminates in a T-shaped portion 9| having downwardly extending arms 92 (Fig. 4) which constitute abutments which cooperate with arms 93 on the right ends (Fig. 7) of a series of selector ngers 94. Selector fingers 94 comprise a series of thin, flat members arranged in superposed relation between guide plates 95, and are equal in number to the signaling elements of the code on which the receiving'printer operates. Thus, if a five-unit code is employed, there will be five of the selector iingers 94, whereas a six-unit code will require six selector fingers. The guide plates 95 are mounted on studs 96 secured to the selector' mounting plate 91 (Fig. 4), and are spaced by washers (not shown). The circular right ends 98 -of selector ngers 94 engage corresponding'sockets of thin fiat bell crank levers 99 pivoted on a common shaft Individual springs |02 bias the bell cranks 99 in their clockwise direction whereby the selector ngers 94 are urged leftwardly (Fig.,'1). The pointed ends |03 of bell crank levers 99 are thus maintained in contact with the selector cam drum 5|.

As previously mentioned, selector cam drum 5| is provided with a helically arranged series of cam projections 55 (Figs. 1 and 4), one for each of the bell cranks 99, which function to rotate the bell cranks 99 in succession and thusdraw the selector ngers 94 rightwardly (Fig. '1) successively as the selector cam drum 5| is rotated.

In addition to the longitudinal movement, the E against one or the other of the abutments 92 of the T-shaped portion 9| of selectorlever 19. As the signal impulses are received over the telegraph line, the selector magnet" 83 is energized and deenergized depending upon the nature of such impulses, and as a result thereof, the abutments 92 are caused to cooperate with one or the other of the arms 93 to provide a fulcrum about which the respective selector fingers 94 are rotated.

` Since in start-stop systems the normal stop condition of the line is marking or current on the line, the selector magnet 83 will be normally energized and the selector lever 19 will be attracted and held in its counterclockwise position. Upon the receipt of a start impulse, which is of spacing nature, the selector magnet 93 will become deenergized and the spring 88 will bias selector lever 19 in a clockwise direction causing arm 18 to depress plunger 1 1 to release latch 68 from stop gate 64, thus permitting the selector cam drum 5I, through the release of its lu'g 63, to rotate, which rotation ensues during the reception of a series of impulses constituting a signal. During the rotation of selector cam drum 5I, the cam projections 55 successively cooperate with bell crank levers 99 causing them to rotate against the action of their individual springs |02 to bring the selector fingers 94 rightwardly toward the U-shaped portion 9| of selector lever 19. At the instant of reception of each code im? l pulse, a cam projection 55 coacts with a bell crank 99 so that depending upon whether the code impulse is of marking or spacing nature, the selector lever 19 will assume either its clockwise or counterclockwise position to permit `the abutment of one or the other of the arms 93 on selector nger 94 with the corresponding depending arm 92 on selector lever 19. Thus, upon the reception of a marking impulse, selector lever 19 will assume its counterclockwise position to cause the rocking of selector nger 94 to its clockwise position. On the other hand, if the received impulse is of spacing nature, selector magnet 83 will become deenergized and selector lever 19 assumes its clockwise position whereupon selector nger 94 is caused to rock to its counterclockwise position or the position shown in Fig. 7.

The left end of each of the selector iingers 94 cooperates with a T-lever |05 pivoted on a common shaft |06 and are likewise arranged between guide plates 95. The reciprocation longitudinally of ngers 94 by bell cranks 99 under the influence of springs |02 will effect the rocking of T-levers |05 to their clockwise or counterclockwise position depending upon whether ngers 94 are in their counterclockwise or clockwise position, respectively. T-levers |05 are pivotally articulated to individual code bars II5, |20, and |2| of a series of code bars |01 slidably mounted on studs |08 and |09. The series of code bars I 01 are set permutably in accordance with the received code combinations ofimpulses by the selector mechanism just described, and are retained in their set position by the coaction of detent member III with detent notches II2.

Cooperating with the series of code bars |01 are a plurality of selector drop bars, or abutment members IIS (Fig. 2). In the present embodiment there are eight members I I3, and associated with each member I|3 is a companion labutment member I I4. The ends II 9 of arms IIB of selector members IIS and II4 provide abutments for a series of stop arms or projections |00 and |22 helically arranged around and afxed to a cylinder |25 (Fig. 1). Incidentally, each of the arms I I6 has a vertically extending guide lug I I1 which cooperates with a guide comb |I8 (Fig. 7) Stop arms |00 and |22 terminate in a pair of stepped shoulders 230 and |24, one or the other of which strikes a selected member |I3 'or |I4, as will presently appear. Although the series of code bars |01 effect the selection of the selector members I I3 and/or `II4, three of the code bars IIS (Fig. 3), when operated permutably, eiect the selection of. one of the eight members |I3. The bottom code bar |20 of the series of code bars |01 is so arranged with its notches as to permit or prevent the selection of the companion selector member I4. The fth or top code bar |2| has its wards or projections only about one-half as high as the wards of the code bars II5 so that, compared with code bars |I5, code bar |2| may in eiect be deemed to have notches of two dierent depths, one depth functioning to permit a predetermined entrance of the selector member ||3 therein to coact with the stop arms |00 or |22 in a certain ,mannenand the deeper notches permitting a further movement of the selector bars II3 to cause their coaction with the stop arms in a diierent manner. As shown in Fig. 3, the selector members II3 cooperate only with the upper four code bars ||5 and |2|, and the companion selector member II4 cooperates only with the bottom code bar |20. Each selector member I3 has a laterally disposed pin or stud |30 (Fig. 7) positioned in 'the path of rotation of the companion member |I4, so that each selector member II3 can, under certain operating condi tions, exercise control over its companion member |I4, as will be discussed presently.

Selector members II3 and II4 are normally biased in a clockwise direction by springs |60 and |10, respectively, Figs. 2 and 9. Thus, when the middle three code bars ||5 are positioned in accordance with their corresponding code impulses of the code signal, an alignment of notches result to eiect the selection of one of the selector members I3. The amount of its clockwise rotation in response to the pull of its spring is determined by the selective position of the top code bar |2| ;f for example, the surface I|0 of one of the truncated wards of code bar |2| will permit the selector member II3 to -rotate only to such an extent that its end II 9 is presented into the path of the shoulder 230 of a stop arm |00 or |22. If the top code bar. |2| is shifted so as to permit the movement of selector member II3 against the bottom |23 of a deep notch, further-rotation is permitted to selector member II3 so that its end |I9 is presented into the path of shoulder |24 of its associated stop arm |00 or |22.

With the permutations of the three middle code bars I|5, eight selections are possible. With the addition of the top code bar |2|, the number of selections is doubled, thereby permitting, with selector members II3, sixteen possible selections. Now, with the further addition of the bottom code bar` |20 and the response thereto of selector members II4, the number of selections is increased or again doubled, giving thirty-two possible selections in the following manner: When the bottom code bar |20 is in one of its longitudinal or selective positions, its lugs thereon act to block the clockwise movement of selector member II4, but when the bottom code bar |20 is moved to its alternate position, a notch ispresented to the vertical arm of the selector member I I4 whereby, when the main. selector member I I3 is selected and permitted to rotate clockwise under the action of its spring |60, the selector member ||4 associated with said selected member ||3 is permitted to follow, in which case the actuated member I |4 is held against the laterally disposed stud |30 by its spring, and in this manner the main selector member 3 and its companion member ||4 move as a unit.

vThe shoulders 230 and |24 on each of the helically arranged arms and |22 are so positioned angularly (Fig. as `to correspond with the angular positions of type facesl ona type Wheel |26 so that when one of the selector members ||3 and ||4 is moved into one ofthe paths of rotation of shoulders 230 and/or |24, the cylinder will be permitted to rotate in a counterclockwise direction until one of the stop arms |00 or |22 is arrested by the selected member ||3- or ||4. In this manner a character on the type wheel is brought into printing position.

Referring to Figs. 4 and 9, the cylinder |25 which carries the stop arms |00 and |22, is

rotatably mounted on shaft 54 at the -left end of which (as viewed in Fig. 4) is carried the type 'wheel 26. The left end. of the shaft 54 is counterbored to receive a stub shaft |28 integral with the type wheel assembly and is provided with an open ended slot |29, which engages apin |3| integral with shaft |28. Shaft 54 is journaled in a bushing |32 carried in a bracket |33 on the printer frame. Shaft 54 is also similarly journaled in bracket |34. A constant torque is applied to shaft 54 through friction means |35 associated with a constantly rotating gear 53, which meshes with gear 52 affixed to-the vertical main shaft 29. The frictional connection between gear 53 and shaft 54 is maintained by a coiled compression spring |38 (Fig. 8).

Rotation is imparted to cylinder |25 by the shaft 54 through the instrumentality of a driving disc |39 affixed to shaft 54. Disc |39 has a laterally disposed arm |4| which, through an interponent |42, coacts with an arm |43 integral with cylinder |25. Thus, when` cylinder |25 is free to rotate by the removal of selector members ||3 and ||4 from the paths of stop arms |22, rotational movement will be imparted thereto by the shaft 54. Arms |4| and |43 are normally biased attrahentlyby a spring |40 coiled about shaft 54. Interponent |42 is integral with a sleeve 245 slidably and rotatably carried on shaft 54, which Will be further discussed in connection with the shift and unshift functions.

As previously described, there is mounted on the main shaft 29 (Fig. 4) a sleeve 34 which carries, among other cams, a vtransfer cam 36, which cooperates with a follower roller |36 (Fig. 8) carried at the extremity of a transfer lever |44 (Figs. 1 and. 8) pivotally mounted on a vertical shaft |45. The forward end of transfer lever |44 is pivoted to one end of a link |46 (Fig. 1), the other end of which is pivoted to a depending arm |41 of a transfer bail 48. Transfer bail |48 is rockably carried on a shaft |49 and is provided with a web portion |5| positioned beneath and spanning all of the selector members ||3 and H4.

Upon the reception of Va code signal, a start impulse thereof acts to initiate the rotation of the selector cam drum 5| to eiect the selective positionment of the selector fingersl 94 as previously described. However, due to the locking action of the detent upon the code bars |01 (Fig. 7), springs |02 of the selector levers 99 are unable to effect, through T-levers |05 (until at a predetermined instant), the shifting of the code bars |01 to a succeeding selection. Hence, through the instrumentality of the transfer mechanism, this transfer of the setting of the selector fingers 94 to the code bars |01 is accomplished. Therefore, at a predetermined instant in the cycle of rotation of cam drum 5|, a cam projection |90 thereon acts upon an arm |52 of clutch release bail 45 to effect the disengagement of arm 44 from cam 48 of the' driven portion 4| of clutch 38, thus permittingvthe engagement of portions 4| and 39l of the grab clutch 38 to effect the rotation of cams 35, 36, and 31, of which cam 36 acts to effect the transfer operation.l

Upon rotation of cam 36, counterclockwise rotation is imparted to lever |44, which through link |46 (Fig. 1) rocks the transfer bail |43 in a counterclockwise direction which, through its web portion |5|, rocks all of the selector members ||3 and 4 counterclockwise bringing the vertical arms thereof out of engagement with code bars |01. Simultaneously, detent being controlled by the transfer bail |48 is lifted out of locking engagement with the code bars |01, whereupon code bars |01 are free to be reshifted to their newly selected position in response to the selective positionment of the several selector fingers 94. After permitting sumcient time to e'ect the shifting of the code bars |01 into their new position, cam 36 permits the transfer bail 48 to be rocked to its clockwise position thus allowing selector members I3 and |4 to be free to respond to the pull of their respective springs |60 and |10 into engagement with the series of code bars |01, as a result of which one of the selector members ||3 will find an alignment of notches, whereupon the selected member ||3 will rotate clockwise a greater distance into the path of its associated stop arm |00 or |22. A member ||3 is invariably selected, the selection of its companion member ||4 being eiected simultaneously with a member ||3 only when it is permitted to do so by the proper positioning of code bar |20; that is, when it is desired to select a member ||3 only, its companion member ||4 is blocked against rotation under the action of its spring |10 by the code bar |20, and the pin carried by member ||3 will be moved free of the' companion member ||4. On the other hand, when it is desired to select a member |14, the alignment of notches for its main member ||3 is made, and also, code bar |20 is shifted out of blocking engagement with member 4, and hence member |4 is permitted to bear against the pin |30 on its companion main member ||3 and follow said main member, thus effecting the simultaneous selection of a pair of selector members ||3 and ||4.

Afiixed to the cylinder |25 is a star wheel |53, the teeth or points of which have a definite relation, as will presently appear, with the stop arms |00 and |22, and hence the angular positions of the type faces upon the type wheel |26. Cooperating with the teeth on the star wheel |53 is an intercepting arm |54 of a lever |55 (Fig. 1) which is pivotally carried on shaft |49. Lever |55 is provided with a depending arm which coacts with an eccentric adjusting screw |56 mounted on arm |41 of transfer bail |48. A spring |51 distended between an extension on link |46 and a lug integral with lever |55 tends to cause said depending arm to bear constantly against the adjusting screw |56 and to cause lever |55 and transfer bail |48 to rotate as a unit. Thus, when transfer bail |48 is eil'ective during the performance of the transfer operation, as previously described, to rock selector members ||3 and I4 outof the path of stop arms and |22, the cylinder |25 will not rotate or' spin freely because of the fact that intercepting arm |54 has been biased by spring |51 into the path of the oncoming tooth of the star wheel |53. Then when the transfer bailY |48 isreturned to its unoperated position, intercepting arm |54 is withdrawn from engagement with the tooth on the star wheel |53 whereupon star wheel |53 and the cylinder |25 are free to rotate until one of the stop arms |00 or |22 is arrested by theI impingement of one of the shoulders 230 or |24 thereon against the end ||8 of the selected member ||3 or ||4 to thus bring a type face on th type wheel |26 into printing position.

Printing cam 31 (Figs. 1 and 4) cooperates with a follower roller |58 carried on one arm of a printing control lever |59 pivotally mounted on the vertical shaft |45. 'I'he lever |59, as shown in Fig. 8, is normally biased in a ounterclockwise direction by a spring 250 to hold follower roller |58 against the periphery of cam 31. Lever |59 is pivotally articulated to the forked end of a link |6|, the other end of which is pivoted to a printing arm |62 pivotally m unted at |63 upon a bracket |64 integral with the printer frame 41 (Fig. 4). Distended between printing arm |62 and frame 41 is a printing springk |65. Printing arm |62 terminates at its upper end with a striking surface |66 which acts upon the type wheel |26 to effect printing.

The type wheel |26 consists of a circular disc, having cut around the circumference thereof equallyspaced radial slots |61 (Fig. 5) thus forming a series of radiating reeds |68 upon which letters and figures are arranged in a single row. Adjacent the striking surface |66 is a V-shaped knife edge |50, which, as printing is being effected, projects into a notch in aperipherally notched corrector disc |80, to properly align and hold the type wheel in printing position in well-known manner. Printing arm |62 is provided, between the link |6| and the end |66, with a hook portion |69 which engages a ange |1| associated with type wheel |26. Type wheel |26 is provided, as previously mentioned, with a stub shaftl |28 which fits into the counterbored end of auxiliary shaft 54. In this manner, type wheel |26 is slidably or telescopcally articulated to shaft 54 and by means of the inter-engagement of hook |69 and flange |1I, printing arm |62 is positively actuated, through link |6|, by printing lever |59 to impart, in turn, movement to type wheel |26 after printing; the purpose of which is to permit visibility of a character immediately after it is printed. To achieve this result, type wheel |26 is withdrawn from the printing platen |12 a sub-l stantial distance by means of the inter-engagemerit of hook |69 and flange |1|. Ink is supplied to the type wheel by an inking roller 80 carried on the end of a resilient supporting bracket 90 which is secured to the frame 41. 'Ihis arrangement permits the inking roller 80 to have contact with the type wheel.|26 at all times during.

its reciprocative movement in the printing cycle.

Upon the initiation of the printing operation, the cam 31 is rotated when the clutch arm 44 is released from shoulder 48 (Fig. 4) asvpreviously described. Follower roller |58 rides on a high portion of cam 31 whereupon clockwise rotation is imparted sharply to printing lever |59 against the actionrof spring 250 to permit printing spring |65 to act independently on the printing arm |62, due to the slotted interconnection between lever` |59 and link I6|.`-. However,'the first portion of the movement of printing arm |62 is employed, through the instruriiem' tality of hook |69 and angef|1|g to bring the /t-ype f'wheel within printing rangeof theplaten |12, whereafter the further movement of printing arm |62 by spring |65 is utilized to present the end |66 thereof against a reed |68 of the type wheel |26, thus Lbringing the type face thereon against the record material disposed in front of the platen |12. Cam 31 thereafter permits the printing lever |59 to rotate counterclockwise under thev action of its spring 250, to effect leftward movement to link |6| to bring printing arm |62 to its counterclockwise position and stretching spring |65 thereby storing energy therein. This ismade possible due to the overpowering action of spring 250 upon printing spring |65. At the same time, through hook |69 and flange |1|, type wheel -|26 is withdrawn from l the platen to permit visibility of the character last printed. To permit proper adjustment between printing arm |62 and link |6|, printing arm |62 is provided with an enlarged hole to receive the shouldered clamping nut |13, and to facilitate this means of adjustment, link |6| is provided with an open ended slot |14 adapted to engage a guide pin mounted on printing so arm |62. v-

Platen |12 is carried in a carriage or frame indicated generally by the numeral |16 (Figs. 4 and 7). Associated with platen |12 are pressure and guide rollers |11 which are of well-known construction and are not a part of the present invention. The platen carriage |16 is slidably mounted upon the. frame 41 of the printer through the medium of ball bearings |18 and |19. spacing rack |8| (Fig. 7), and cooperating with rack |8| is a spacing pawl |82 pivotally mounted on an arm |83 of `a plural arm lever |84. Pawl |82 is normally biased into engagement with rack |8| by a spring |81. Arm |85 of lever |84 carries a follower roller |86 which cooperates with the spacing cam previously mentioned. Thus upon rotation of cam 35, when arm 44 is disengaged from the driven clutch member 4|, clockwise rotation is imparted to lever |84 causing pawl |82 to be actuated leftwardly, as viewed in Fig. 7, to move rack |8| one tooth and to move thereby'the platen carriage |16 one character space. To retain the platen carriage at the character space position to which it. has been just moved, a detent pawl |88 is provided which also cooperates with rack |8| and is spring biased thereagainst by a spring |89. Asthe platen carriage is actuated leftwardly, as viewedin Figs. 7 and 9, it tends to wind up a carriage 1' e' turn spring 260 thus storing up energy to effect,l

upon receipt of the carriage return signal, the carriage return operation, the` carriage return spring being connected to the platen carriagein well-known manner.

Certain of the companion members ||4 control the function operations, such as carriage return, line feed, shift and unshift, and have depending arms |92, 2|2, 221, and 228, respectively (Figs. 1, 2, and 9), which control the suppression of the printing and spacing operations. As a function selector member ||4 is rocked 4clockwise by its spring |10, its dependingarm |92, 2|2, 221 or 228 acts on a bail portion |93.ofJa printing and spacing cut-out lever |94 (Figs. 1 l and 9) to cause said lever |94 to be rocked `clock- Mounted on the platen carriage |16 is a` wise. Lever |94 is normally biased in a counterclockwise direction by a spring 202.

Lever |94 has an arm |95 which extends in front of and blocks, under certain operating conditions, a projection |86 (Figs. 1 and 4) integral with link |8|, thus during the operation of a function wherein it is desired to prevent the printing and spacing operations, arm |95 is presented into the path of lug |96 so that when the printing spring |65 tends to operate the printing arm |62, it is prevented from so doing by the blocking action of lever arm |95 upon link |6|, thus cutting out the printing operation when certain functions are performed. Simultaneously therewith, character spacing of the platen carriage |16 is prevented in the following manner: Lever |94 is also provided with a curved arm |91 (Fig. 2) to the terminal end of which is pivoted one end of a link |96, the other end of which is pivotally articulated to one arm of a bell crank lever |99 ,(Fig. '1) pivotally mounted on the printer frame 41. The other arm of bell crank |199 carries a stud 20| engaging a slot in pawl |82. Accordingly, when Vthe printing and spacing cut-out lever |94 is permitted to operate upon the selection of a function, not only will the arm |95 thereon act to block the movement of link |6| and prevent the printing operation, but also, link |96 will be actuated rightwardly (as viewed in Fig. '7) to rock bell crank lever |99 clockwise to effect the withdrawal of pawl |82 from rack |8|. Thus, when lever |64 operates in a normal manner to perform the spacing operation, its action will be negatived by the prior withdrawalof pawl |82 from the rack |8|. When a carriage return code signal is. received to initiate .the carriage return operation, the code bars |01 are set permutably in response thereto, thereby effecting the selection of the particular selector member I|4 that is provided with depending arm |92, and that is also provided with a projection 200 which acts upon an arm-203 (Figs. '1 and 9) of a member 204 pivotally mounted on pins,or trunnions 205 and 206. Member 264 is also provided with vertically extending arms 201 and 208 which engage pawls |88 and |82 respectively. Therefore, when the carriage return selector member ||4 is actuated by its spring |10, member 204 is rocked inwardly (away from the reader as viewed in Figs. '1 and 9) by the action of projection 200 upon arm 203 to effect the withdrawal of both pawls |86 and |82 from the rack |8| whereupon the platen carriage |16 is free to respondto the pull of the carriage return spring. Pawls |62 and |68 are held withdrawn from the rack |8| for the duration of the carriage return cycle, to insure the full return of carriage |16, by a latch 210 (Fig. '7) pivoted at 21| to the printer frame 41. Latch 210 is adapted, through the action of spring 212, to engage arm 201 of member 204, until it is disengaged by the impingement of a pin (not shown), carried on the bottom side of platen carriage |16, upon the end 213 of latch 210. To absorb the blow caused by the rapid return movement of the platen carriage |16 in response to the action of the carriage return spring, a dashpot, (not shown) is provided.

The line feed operation is controlled in a man ner similar to the carriage return operation, by a particular selector member ||4 which is selected upon the receipt of a line feed code si'gnal. The line feed selector member ||4 has a depending arm y2|2 to the lower end of which is pivoted one end of a link 2|3 (Figs. 1, 2, 4, and 9) case characters.

the other end of which is pivoted to an arm 2|4 (Figs. 1, '1, and 9) pivotally carried at the extremity of an arm 2|5 of thev plural arm lever |84. Thus, when the line feed selector member ||4 is selected, it is permitted to rotate clockwise thereby drawing the link 2|3 leftwardly (Figs. 1 and 7) to bring the free end` of arm 2|4 into the path of depending arm 2| 6 `of a'line feed `lever 2|1 pivoted at 2|8 to the printer frame 41. Then, when the plural arm lever |84 is actuated in a clockwise direction by the spacing cam 35, arm 2|4 is urged forwardly as viewed in Fig. '1, or leftwardly as viewed in Fig. 4, to rotate the line feed lever 2|1 clockwise, which movement is effective, through a line feed pawl 2|9 carried on the end of lever 2|1, to rotate the line feed ratchet 22| a single angular step. As shownA in Fig. 4, the line feed ratchet 22| is fixed to one end of a shaft 222, to the other end offwhich is fixed a gear 223 which meshes with a long pinion 224 so that gear 223 has slidable meshing engagement therewith. In this manner, gear 223 is operatively connected with pinion 224 regardless of the character spacing position of the platen carriage |16. Therefore, when the ratchet 22| is rotated one angular step, this rotation is imparted through shaft 222 and gear 223 to the pinion 224, and thence through idler gear 225 to a gear 226 fixedly associated to the platen |12. Simultaneously, with the performance of the line feed function, the depending arm 2|2 also acts upon bail |93 to effect the suppression of the printing and spacing operations in the manner previously described.

The shift and unshift mechanisms are controlled by the particular selector members ||4 having depending arms 221 and 226, respectively (Figs. 1 and 2). Pivotally connected to the depending arms 221 and 226 are links 229 and 23|, respectively. Link 229 is pivoted to a latch member 232, and link 23| is pivoted to a latch member 233, which latch members are pivoted by common pivot 234 to the end of an arm 235 of the plural arm lever |84 (Figs. 1, 2, '7, and 8). Each time that the plural arm lever |84 is rocked by its `cam 35, latches 232 and 233 are reciprocated frontwardly and rearwardly of the apparatus. Latches 232 and 233 terminate in their free ends with laterally disposed portions, which under certain predetermined conditions engage the ends of arms 236 and 231, (Fig. 4) respectively. Arms 236 and 231 are pivoted at 238 and 239 respectively, to a shift control lever 24| pivoted at 242 to the printer frame 41. Lever 24| is provided with a vertical extension, carrying at its upper end a stud'243 (Fig. 1) which fits into a, groove 244 Vin the periphery of a sleeve 245 slidably mounted on Athe shaft 54. Integral with sleeve 245 is the interponent |42 previously described, which is disposed between the two arms |4|4 and |43. Thus, when the shaft 54 rotates, the. arm |4| of disc |39 xed to shaft 54 imparts rotation not only through interponent |42 to the sleeve 245, but also through interponent |42 and arm |43 tothe cylinder |25. Arms |4| and |43 are normally biased attrahently by a common spring |40 (Figs. 4 and 8), and when the arms |4| and |43 assume the position closest to each other, the relationship between the stop arms |00 and |22 and the type wheel |26 is such as to print upper However, when the sleeve 245 is shifted leftwardly, as-viewedin Fig. 4, or forwardly, as viewed in Figs. 1 and 8, in a manner presently to be described, the interponent |42 will act upon the inclined cam surfaces 241 and 248 (Fig. 8) on arms |4| and |43, respectively, to spread said arms 4| and |43 apart against the action of the common spring |40, thereby changing the angular relationship between the stop arms |00 and |22 on the cylinder |25 and the characters on` type wheel |26 one character position to print thereafter the characters in the lower case position. The angular relationship between type wheel |26 and cylinder |25 is thus alterable because the type wheel is constrained to move with shaft 54 (to which disc |39 is also fixed) and cylinder is freely mounted on said shaft. Therefore, it is manifest that through thc medium of interponent |42 and cam surfaces 241 and 248, the arms |4| and |43 may be spread apart to change said angular relationship, and upon retraction of interponent |42 and the concurrent action ofspring |40, the original relationship will be restored.

To eect the shifting and unshifting operations, one or the other of the arms 221 or 228, respectively, is actuated upon the selectionof its' associated selector member |4 in response to the shift or unshift code combinations, respectively. Upon the receipt of an unshift code combination, the particular selector bar ||4 having the depending arm 228 will be actuated ina clockwise direction which, through link 23|, will rotate latch 233 clockwise, as viewed in Fig. 1, to bring its laterally disposed end into cooperative relation with the end of lever arm 231, whereafter upon the succeeding rocking movement of plural arm lever |84 imparted to it by cam 35, the latch 233 will be actuated rearwardly and in so doing will pick up the lever arm 231, which will thereby also be actuated rearwardly to impart counterclockwise rotation (as viewed in Figs. 1 and 4) to the shift control lever 24|. This movement of lever 24| will cause, through stud 243, the sleeve 245 to be shifted leftwardly whereby the vertical interponent |42 will act upon the cam surfaces 241 and 248 to ,spread the arms |4| and |43,`respec4 tively, thus changing the angular relationship 'between the stop arms |00 and |22 and the characters on type wheel |26 to print thereafter unshift or lower case characters, until a shift code combination is subsequently received.

When the shift code combination is received, the selector member ||4 provided with the depending arm 221 is, upon selection, rocked clock- Wise to actuate the link 229 leftwardly to rotate arm 232 clockwise to bring its laterally disposed end into cooperative relation with arm 236 whereafter, upon the ensuing 'rocking movement of plural arm lever |84, the arm 232 will be reciprocated; and upon the rearward movement in its lreciprocating cycle, arm 232 will pick up the lever arm 236 to impart therethrough clockwise rotation to shift control lever 24 ,which through stud 243 will shift the sleeve 245 rightwardly to retract interponent |42 from the cam surfaces 241 and 248, whereupon spring will again draw the arms |4| and |43 together, thus bringing the stop arms |00 and 22 and the characters on the type wheel |26 into that relation whereby shift or upper case characters will thereafter be printed. Simultaneously with the performance of the shiftand unshift functions, the depending arms 221 and 228, respectively, also act upon bail i |93 to effect the suppression of the printing and spacing operations as described hereinbefore. The position of the shift mechanism as shown in the drawings is such as to effect the printing of upper case characters.

The. type wheel employed in the apparatus according to the present invention is shown in Fig'. 5, and, as previously'mentioned, comprises avr flat circular disc having'a seriesofradial slots |61 thereinfthus kproviding .a pluralityof radiating reeds |68 carrying,- adjacent their circumferential ends,type faces252'; vThe lower case characters are designated by line 253,and`v the upper case characters are designated by line 254. It is thus noted that upper case and lower case characters arearranged alternately. However, for the purpose ofthe present disclosure, the angular distance between successive lower case characters is deemed to be one step, land correspondingly the angular distance between upper case characters is also deemed to be one step. Therefore, the distance between adjacent lower case and upper case characters is referredA to as one-half step; that is, when the angular relationship between the characters on the type wheel and the stop arms |00 and |22 is such as to cause the printing of lower case characters, each shoulder on the ends of the stop arms |00 and |22 is effective with its associated selector member ||3 or 4, as the case may be, to position a lower case character in to printing position. Then, when it is desired to printA upper case characters, the relationship between stop arms |00 and |22 and the selector members ||3 and ||4 is not changed, but the type wheel is shifted angularly, by the aforedescribed shift mechanism, in relation to the st'op arms so that whenthe shoulders on-the stop armsv coact with the selector members ||3 and/or ||4, an upper case character will be presented to the printing position.

While the total number of permutations obtainable with five code bars is thirty-two, and with the shift and unshift possibilities, this total number is doubled; namely, to sixty-four, the type WheelA |26 would normally be provided with sixty-four angular positions which, in the present arrangement of characters, would leave eight more blank spaces than are shown in Fig. 5, to allow for the performance of functions. However, with the apparatus according to the present invention, provision is made for suppressing the printing and spacing operations when functions are performed, thus making it possible to eliminate eight of the blank spaces, thus permitting the type wheel to be divided into eight less divisions, having thereby fty-six equal divisions instead of sixty-four, thus strengthening considerably the type wheel by making the reeds of greater width l It is seen that by the elimination of eight blank spaces, the teeth on the star wheel |53 have been distributedto'provide an arrangement (asindicated in Fig.\5) wherebyon one side of the type wheel the teeth are arranged to span eight characters (as at |21),for each of four l tooth-spaces on the star wheel |53, while on the other side of the type wheel the teeth are spaced to span six characters (as at 220) for each' of four tooth-spaces on the star wheel, `two blank spaces having been eliminated for each of the latter four Y tooth-spaces.

With the spacing of the teeth on star wheel |53 as indicated at |21, the stop arms |22 are arranged with their shoulders 230 and |24' spaced at regular angular intervals.v However, by eliminatingblank positions and thus reducing the numberof character positions on thetyp'e wheel,

it is possible to alter the position of certain ones The shoulders 230, then, of the arms |00 are thus advanced two angular spaces, to assume the anguiar position thatwould otherwise'\'be'jassumed by its associated shoulder |24. In other words, the two arms |22 embraced in space |30 (Fig. 5)

comprise four stop positions and include three ofl the aforementioned full steps; while the two arms and |22 embraced in the space |01 comprise three stop positions and include two full steps.

A feature of the invention consists in providing a taut wire paper knife associated with the platen |12 as shown in Figs. 4, '1, and 10. As illustrated in Figs. 4 and '1, a backing plate 2551s mounted in platen carriage |15 above the platen |12, and positioned in front of plate 255 is a wire 255 which is provided with means for rendering it'taut for paper carrying purposes. As shown in Fig. 10, wire 255 is folded back at its ends and is anchored in adjustable screws 251 and 250 carried in end plates 250 and respectively, of the platen carriage |15. 'Ihe desired tautness of the wire 255 is established by turning the set screws 251 and 250 sumciently, and lock nuts 252 and 253 are provided to maintain the tautness. 'Ihe utility of a taut wire paper knife is emphasized by the fact that it does not interfere with the lines of printing due to the fact that it is of suiiicient narrowness to be readily confined between the lines of printing.

A further feature of the invention consists in providing an anti-rebound device for preventing the cylinder 25 from rebounding after one of the stop arms |00 or |22 has impinged against a drop bar or abutment member ||3 or ||4. A specific embodiment of this device is shown in Fig. 6 and comprises a wheel 202 fixedly associated with cylinder |25 and provided around its periphery with teeth 203 spaced to correspond withthe angular posltionment of shoulders |24 and 230 of stop arms |00 and |22. Cooperating with toothed wheel 202 is a pawl member 204 pivotally carried at 205 on the frame 41 and spring biased normally into engagement with the teeth 203 by a spring 205. The shape of teeth 203 is such that the advancing edge of each tooth is inclined so as to cam out the pawl member 204, and the trailing edge of each tooth .is radial with Irespect to wheel 202 so as to permit engagement thereof by the pawl member 204. Thus when the wheel 202 rotates in a counterclockwise direction (as viewed in Fig. 6) the teeth 203 act to cam the pawl member 204 outwardly against the action of spring 205 until one of the arms |00 or' |22 strikes a selected drop bar ||3 or ||4. Then, should the cylinder |25 tend to rebound ina clockwise direction, this action will be prevented by the latching effect between pawl member 204 and an engaged tooth 203. opposite side of a tooth 2031 to revent rebound, when the rotating arm |00 or |22 is suddenly brought to a stop by engagement with the selected drop bar ||3 or ||4.

General operation A complete description of the cycle of operations involved in the printing of a character and also in the operation of a function will be described. For example, it will be assumed that a characteiT is to be printed, following which a function, such as shift is to be performed.

That is, the pawl 204 engages with the character code signal has been received, the clutch throwout lever 44 is tripped by operation of the lever |52 by the cam |00 of the cam'drum v 5| and the' clutch 30 becomes engaged, whereby rotation is imparted to the cams 35, 30, and 31. Almost immediately after the cams begin to rotate, the cam operates its follower |35 (Fig. 7) which in turn, through lever |44, operates transfer bail |40, whereby the character code combination in accordance with the setting of the selector fingers 04, is permitted to be transferred to the code bars |01. As the operation of the transfer bail causes the particular drop bar ||3 which had been selected previously to be lifted out of the notches (and the detent to be lifted out of the notches ||2) the code bars |01 are shifted to present a new alignment of notches, whereafter upon the return of the transfer bail |40 to its former position another one of the drop bars ||3 will follow into the new alignment of notches.

Incidentally, while the transfer bail was thus operated to raise the drop bars out of engagement with the code bars |01, thereupon lifting ends I0 out of abutting relation with the' Istop arms |00 and |22, the cylinder |25 was prevented from spinning by the presentation of end |54 of lever |55 into the path of the oncoming tooth of vstar wheel |53. Then, when the transfer bail |40 is returned to its clockwise position, end |54 is withdrawn from engagement with star wheel |53 to permit the rotation of cylinder |25 until one of the shoulders 230 or |24 of stop arms |00 or |22 abuts the end ||0 of the newly selected drop bar ||3 or ||4. Immediately after the type wheel |25 has been stopped under the control of cylinder |25, the printing cam 31 acts upon follower roller torotate lever |50 clockwise (Fig. 7) which permits the printing spring |55 to actuate the printing arm |52 clockwise (Fig. 4). g

As previously mentioned, type wheel |25 is so spaced from the platen |12 as to provide visible printing. Therefore, the first portion of the clockwise movement of printing arm |52 is utilized (through hook |50 and head |1|) to bring the type wheel |25 within printing range of the platen, whereafter the remainder of the operative stroke of the printing lever |52 is employed in effecting, through end |55, the printing operation.

In proper timed Arelation with the printing operation, and preferably immediately thereafter, the character spacing of the platen is performed through the instrumentality of spacing cam 35, which through its follower roller causes lever |05 to be rotated clockwise (Fig. 7) whereupon spacing pawl |02 is actuated leftwardly, to move, through spacing rack |0|,-the platen carriage |15 leftwardly one character space.

Assuming that the next signal received is a shift code combination, the selector magnet 03 will respond to the impulses thereof to initiate the rotation of the cam barrel 5| and to control the setting of the selector `lingers 04, in the manner previously described. At a timed instant during the rotation of cam barrel 5|, the cam |00 thereon will, through bail 45, effect the disengagement of clutch arm 44 andthe consequent initiation of rotation of clutch 30. l operation of transfer bail |40 through the instrumentality of transfer cam 35 the setting of the code bars |01 in accordance with the shift code combination is permitted. When the transfer bail isreturned to its normal position, the particular drop bar I4 having the depending arm Upon the 221 is selected (that is, permitted to fall into alignment of notches) and under the action of its spring |10 is permitted to rotate in a clockwise direction. Link 229 is thereupon actuated in a leftwardly direction to bring arm 232 into operative relation with arm 236 so that when the plural arm lever |84 (Fig. 7) is actuated in a clockwise manner by cam 35, latch member 232 will be reciprocated rightwardly, as viewed in Fig. 4, and will engage arm 236 and impart thereto similar motion, causing the shift control lever 24| to be rocked in a clockwise direction which, through pin 243 (Fig. l), will urge sleeve 245 to the right. permitting spring to move arms |4I and |43 closer to each other. In this manner, thetype wheel is permitted to move one-half step in the normal direction of movement of the cylinder |25 to condition upper case characters for printing.

On the other hand, in response to an unshift code combination, that particular drop bar ||4 having depending arm 228 will be selected where- .by link 23| will be actuated leftwardly to bring `latch member 233 into operative engagement with arm 231, so that upon the subsequent reciprocation of arm 233, lever 231 will be engaged and shift control lever 24| will be rocked counterclockwise causing, through pin 243, sleeve 245 to be moved leftwardly, whereby arm |42 will coact with cam surfaces 241 and 248 to spread arms |4| and |43 apart, against the action of spring |40, suiliciently to change the angular relationship between stop arms |22 and type wheel |26 onehalf step, thereby conditioning the lower case characters for printing.

The invention herein described may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present disclosure is therefore to be consideredV in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims therefore intended to be embraced therein.

What is claimed is: y

1. In a printing telegraph receiver, a rotatable type wheel provided with a plurality of characters, a member having a series of arms less in number than the number of characters on said type wheel for controlling the rotation thereof, a permutation selector mechanism, a plurality of pairs of abuttable stop bars each pair comprising a main bar and a companion bar cooperable with said arms for controlling said member, means whereby said main bars are selectable in two different manners by said selector mechanism under certain operating conditions to cooperate with said arms, and means whereby said companion bars are selectable under other operating conditions simultaneously with their main bar to exercise a prior control over said member.

2. In a selector, a rotatable shaft, arms having a plurality of abutting surfaces arranged around said shaft, a permutation code selector mechanism comprising a plurality of pairs of abutment members, and means whereby the members of said pairs of abutment members are selectable jointly or severally to exercise supervisory oontrol over said shaft. f

3. In a selector, a rotatable shaft arrestable in any one ofa plurality of character positions. a cylinder carried by said shaft having projections thereon less in number than the available number ofvcharacterstcpping positions, abutment members correspondin'gfinnumber to the number of said projections, and means' forrenderlngfsaid members operable either singly or in pairs with said projections for determining the stop position or said shaft.

v 4. In a printing telegraph receiver, a character carrying instrumentality, a rotatablev shaft therefor arrestable in any one of a plurality of character positions, a cylinderv carried bysaid shaft having projections thereon less in number than the available number of character stopping positions, abutment members corresponding in number to the number of said projections and cooperable with said projections for determining the stop position of said shaft, and means facilitated by the vcoincidence of certain of said abutments for reducing the number of character positions on said instrumentality. n `5. In a printing telegraph receiver, a character carrying instrumentality, a rotatable shaft therefor arrestable in any one of a plurality of character positions, a cylinder carried by said shaft having projections thereon less in number than the available number of character stopping positions, abutment members corresponding in number to the number of said projections and cooperable with said projections for determining the stop position of said shaft, shift control mechanism, and shift instrumentalities carried on said shaft and controlled by said shift control mechanism to alter the operative relationship between said abutments and said projections.

6. In a printing telegraph receiver, a type wheel, a rotatable shaft therefor arrestable in any, one of a plurality of character positions, a cylinder carried by said shaft having projections thereon less in number than the available number of character stopping positions, abutment members corresponding in number to the number'of said projections cooperable with said projections for determining the stop position of said shaft, certain of said abutment members provided with function controlling instrumentalities, printing mechanism, and means for suppressing the action of said printing mechanism when said instrumentalities are effective.

7. In a selector, a plurality of code bars, means controlled by signaling impulses for positioning said code bars, a plurality of selectable members, means for selecting certain of said selectable members through the positioning of certain of said code bars, and means whereby other of said selectable members are conditioned for selection through the positioning of other code-bars simultaneously with the selection of'one of said plurality of selectable members.

8. In a selector, a member to be controlled, a plurality of code bars, means controlled by signaling impulses for positioning said code bars, a plurality of selectable members for controlling said member, means for selecting certain of said selectable members through the positioning of certain of said code bars, and means whereby other of said selectable members are conditioned for selection throughthe positioning of other of said code bars to exercise a prior control over said member.

9. In a selector, a member to be plurality of code bars, means controlled by signaling impulses forpositioning said code bars, a plurality of selectable members for controlling said member, means for selecting certain of said selectable members through the positioning, of certain of said code bars, and means whereby controlled, aI

other of said selectable members are conditioned for selection through the positioning of one of said code bars to exercise a prior control over said member.

10. In a selector, a member to be controlled, a plurality of code bars, means controlled by signaling impulses for positioning said code bars, a plurality of selectable members for controlling said member, means for selecting certain of said selectable members through the positioning of certain of said code bars independently of the position of the remaining code bars, and means whereby other of said selectable members controlled by both said plurality of selectable members and said remaining code bars to exercise a prior control over said members.

11. In a selector, a member to be controlled, a plurality of code bars, means controlled by signaling impulses for positioning said code bars, a

plurality of selectable members for controllingy said member, means for selecting certain of said selectable members through the positioning of certain of said code bars independently of the position of the remaining code bars, and means whereby other of said selectable members are conditioned for selection through the positioning of said remaining code bars to exercise a prior control over said member.

12. In a printing telegraph receiver, a type wheel, a member for controlling the rotation thereof, arms having a plurality of abutting surfaces arranged around said member, a permutation code selector mechanism comprising selectable abutment members cooperable with said surfaces to determine the stop position of said member, cam means associated with said type wheel and said member, and means controlled by said selector mechanism to operate said cam means to alter the operative relationship between said abutment members and` said' arms.

13. In a printing telegraph receiver, a character carrying instrumentality, a member for controlling the rotation thereof, arms having a plurality of abutting surfaces arranged around said member, a permutation code selector mechanism comprising selectable abutment members cooperable with said surfaces to determine the stop position of said member, a pair of cam members,

. a sleeve member, an element carried by said sleeve member and interposed between said cam members, and means effective through said sleeve member to control the positionment of said element with respect to said cam members to alter the operative relationship between said abutment `members and said arms.

14. In a printing telegraph receiver, a character carrying instrumentality, a rotatable shaft therefor arrestable in any one of a plurality of shaft having projections thereon less in number than the available number of character stopping positions, abutment members corresponding in number to the number of said projections and cooperable with said projections for determining the stop position of said shaft, a pair of cam members, a sleeve member, an element carried by said sleeve member and interposed between said cam members, and means effective through said sleeve member to control the positionment of said elennt with respect to said cam' members to alter the operative relationship between said abutments and said projections.

15. In a printing telegraph receiver, a shaft constantly tending to rotate, arms having a plurality of abutting surfaces arranged around said shaft, a permutation code selector mechanism comprising selectable abutment members cooperable with said surfaces to determine the stop position of said shaft, means to prevent the spinning of said shaft during the period of reselection of said abutment members, and means to prevent rebound of said shaft upon impingement of said surfaces against said abutment members.

16. In a printing telegraph receiver, a shaft constantly tending to rotate, arms having a plurality Vof abutting surfaces arranged around said shaft, a permutation code selector mechanism comprising selectable abutment members cooperable with said surfaces to determine the stop position of vsaid shaft, and ratchet and pawl means to prevent rebound of said shaft upon impingement of said surfaces against said abutment members.

17. In a printing telegraph receiver, a shaft constantly tending to rotate, arms having a plurality of abutting surfaces arranged around said shaft, a permutation code selector mechanism comprising selectable abutment members cooperable with said surfaces to determine the stop position of said shaft, means operable on said abutment members to enable the reselection thereof, a star wheel fixed to said shaft, means controlled by said means and cooperable with said star wheel to prevent the spinning of said shaft during the period of reselection of said abutment members, and means to prevent rebound of said shaft upon impingement of said surfaces against said abutment members.

18. In a .printing telegraph receiver, a character carrying instrumentality, a rotatable shaft therefor arrestable in any one of a plurality of character positions, a cylinder carried by said shaft having projections thereon less in number than the available number of character stopping positions, abutment members corresponding in number to the number of said projections cooperable with said projections for determining the stop position of said shaft, certain of said abutment members provided with function controlling instrumentalities, printing mechanism, and means common to said certain abutment members and operated thereby to suppress the action of said printing mechanism when said instrumentalities are effective.

19. In a printing telegraph receiver, a shaft constantly tending to rotate, arms having a plurality of abutting surfaces arranged around said shaft, a permutation code selector mechanism comprising selectable abutment members cooperable with said surfaces to determine the stop position of said shaft, a certain one of said abutment members provided with function controlling instrumentalities, line feed mechanism, and power driven means effective under the control of said certain one of said abutment members to operate said line feed mechanism.

20. In a. printing telegraph receiver, a character carrying member, a rotatable shaft therefor arrestable in any one' of a plurality of character positions, a cylinder carried by said shaft having projections thereon, abutment members cooperable with said projections for determining the stop position of said shaft, certain of said abutment members provided with function controlling instrumentalities, a shift control sleeve, a shift control rocker lever articulated to said sleeve, a pair of shift control arms carried by said rocker lever, a pair of reciprocating elements adapted to be brought into' operative relation selectively with said arms by said instrumentalities,

an element associated with said shaft, an element associated with said cylinder, said elements having confronting cam surfaces, an interponent cooperable with said cam surfaces carried yby said sleeve, and power driven means to effectuatethe control of said instrumentalities to alter the operative relationship between said abutments and said projections.

21. In a selector, a plurality of code bars, means controlled by signaling impulses for positioning said code bars, a plurality of selectable members, means for selecting certain of said members through the positioning of certain of said code bars, and means for selecting other of said selectable members through thepositioning of other code bars simultaneously with the selection of one of said certain of said selectable members.

22. In a selector, a plurality of code bars, means controlled byvsignaling impulses for positioning said code bars, a plurality of selectable.

members, means for selecting certain of said members through the positioning of certain of said code bars, and means whereby other of said selectable members are conditioned for selection upon positioning of other of said code bars.

23. In a selector, a plurality of code bars, means controlled by signaling impulses for positioning said code bars, a plurality of selectable members, means for selecting certain of said members through the positioning of certain of said code bars, and means whereby other of said selectable members are conditioned for selection upon the positioning of one of said code bars. y

24. In a printing telegraph receiver, a character carrying instrumentality, position determining means for determining the character to be printed including a plurality of impact elements,

and means facilitated by the coincidence of certain of said impact elements for reducing the number of character positions on said instrumentality.

25. In a printing telegraph receiver, a character carrying instrumentality, a rotatable shaft therefor arrestable in any one of a plurality of character positions, a cylinder carried by said shaft having projections thereon provided with abutting surfaces, said projections less in number than the available number of character stopping positions, abutment members corresponding in number to the number of said projections and cooperable with said abutting surfaces for determining the stop position of said shaft, and means facilitated by the coincidence of certain of said abutting surfaces for reducing the number of character positions on said instrumentality.

26. In a printing telegraph receiver, a character carrying instrumentality, a rotatable shaft therefor arrestable in any one of a plurality of character positions, a cylinder carried by said shaft having projections thereon less in number than the available number of character stopping positions, each of said projections provided with a plurality of steps, abutment members corresponding in number to the'number of said projections and cooperable with said steps for determining the stop positionof said shaft, and means facilitated by the coincidence of certain of said steps for reducing the number of character positions on said instrumentality.

27. In a printing telegraph receiver, a character carrying instrumentality, a rotatable shaft therefor, means for arresting said shaft in a plurality of character positions, said means comprising abutment members and abutting members, shift control mechanism, and shift instrumentalities carried on '.saidshaft and controlled by said shift control mechanism to alter the,l

operative relationship between said abutment members and said abutting members.

28.` In a printing telegraph receiver, a character carrying instrumentality, a rotatablel shaft therefor, means for arresting said shaft in a plurality of character positions, said means comprising abutment members and abutting members, shift control mechanism, and shift instrumentalities carried on said shaft and controlled by said shift control mechanism to alter the `positional relationship between said abutting members and said character carrying instrumentality.

29. In a printing telegraph receiver,l a shaft, a type wheel on said shaft, means also on said shaft for determining its stop position for printing from said type wheel, shift control mechanism, and shift instrumentalities carried on said shaft and controlled by said shift control mechanism to alter the positional relationship between said means and said type wheel.

30. In a selector, a rotatable shaft, arms arranged around said shaft, a plurality of code bars mounted parallel and in juxtaposition to said shaft, means responsive to signaling impulses for setting said code bars, a plurality of pairs of abutment members associated with said code bars and selective through the setting thereof and cooperating with sai d\arms, and means whereby the members of said pairs of abutment members are selectable jointly or severally to exercise supervisory control over said shaft. i

31. In a selector, a rotatable shaft, arms arranged around said shaft, a plurality of code bars mounted parallel and in juxtaposition to said shaft, means responsive to signaling im-fv pulses for setting said code bars, a plurality of pairs of abutment members, and means whereby the members of said pairs of abutment members are selectable jointly and severally to exercise supervisory control over said shaft.

32. In a printing telegraph receiver, a character carrying` instrumentality, a rotatable shaft therefor arrestable in any one of a pluralityof character positions, a cylinder carried by said shaft having projections thereon, abutment members cooperable with said projections for determining the stop position of said shaft, certain of said abutment members provided with shift controlling elements, periodically operated actu.- ators associated with said shift controlling elements, a shift control member, interponents carried by said shift control member and cooperable with said actuators, and shift instrumentalities carried on said shaft and controlled by said shift control member in response to the effectiveness of said actuators upon said interponentsto alter the operative relationship between said abutments and said projections.

33. In a printing telegraph receiver, a rotatable shaft, a type wheel, means rotatable on said shaft for determining its stop position for printing from said-type wheel, shift control mechanism, and shift control instrumentalities carried on said shaft and controlled by said shift control mechanism to alter, during rotation, the angular positional relationship between said means and said type wheel. l

34. In a selector, a unidirectional means to be controlled, a plurality of code bars, means controlled by signaling impulses for positioning said code bars, a plurality of selectable members for controlling said unidirectional means, means for selecting certain Voi' said kselectable members through the positioning ot certain of said code bars. and means for selecting' other of said selectable members through the positioning oi other code bars simultaneously with the selection ot one oi' said certain of said selectable members4 to exercise a priorcontrol over said member.

35. In s. selector, a rotatable member to be conm trolled, arms arranged around said member, a

plurality oi' code bars mounted parallel and in HOWARD L. KRUM. CARL w. swAN.

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