US1623810A - pfainnenstiehl - Google Patents

Description

April 5 y 1927 1,623,810 H. PFNNENSTEHL HUNTING TELEGRAPHY 7 sheets-sheet 1 Filed Jan. 24. 1922 PRINTNG TELEGRAPH! Filed Jag. 24, 1922 7 Sheeis-sheet 2 April A5, 19276 H. PFANNENSTIEHL PRINTING TELEGRAPHY Filed Jn. 24, 1922 '7 Sheets-Sheet 3 H. PFANNENSTIEHL Aprl s PRINTING TELEGRAPHY FiledJan. 24. 1922 7 Sheets-Sheet 4 Il tlllnntlllllllrfllalula/ FNNENSWEHL.

PRINTING TELEGRAPHY April 5 i927.

H., PFANNENSTIEHL.

PRINTING TELEGRAPHY Filed Jan. 24, 1922 7 sheets-Sheet e Amai 5 192?,

lg@ H. PFANNENSTiEs-ll.

PRINTING TELEGRAPHY Filed Jag. 24. 1922 7 sheets-sheet v.

patented lfini. Ei, i927.

recaen ELlRRY FAINENSTEHL. OF MAEPLEWOOD, NEW' JERSEY, ASSGNOR TO "WESTERN ELEOTREC COMPANY, INCORORATED, OF NEW YORK, N. Y., A CORPORATION OF NEW YORK.

PRINTI-IG TELEGRAPHY.

Application filed January 24, 1922.

rlhis invention relates to printin, telegraph apparatus and particularly to a aparatusfor receiving` and translating impulses into printed characters.

in object of the invention is to provide a receiving instrument in'which the various selecting' and printing' operations, so i r as possible. are mechanically controlled and positive in action.

Another object is the provision of means whereby a positive drive connection is established between the driving;` and driven members of the printing mechanism followinga selection.

Another object` is' to provide a shieldingmember in conjunction with the type wheel for preventing the impression of characters adjacent to the one to he printed.

Another object is the provision of means .vhereby the type wheel mav be shifted from Vthe portion carrying` the numeral. and other special characters to that portion -apon which the letters of the alphabet are arrauln'ed and vice versa and the advancement of the printing medium simultaneously.

The invention, according to one of its embodiments, provides an electro-responsive device responsive to selecting' units or impulses, a translating device controlled thereby for translating the effects of such units or imi ulses into mechanical movements, and recording mechanism operated by such translated effects for causing the printing` of the letters of the alphabet, numerals and other special characters on a printing medium.

The electro-responsive device comprises a single electromaanet having its coils connected either directly to the line or controlled by an intermediate or line relay. lhis electromagnet responds to all impulses and upon its initial energization permits the operation of the translating mechanism.

The translating mechanism is made un of a series of rotatable and horizontally movable selecting rods which are successively broughtl under the control of the single electromagnet, there being` a tripping; finger individual to each of the rods. They are moved by the horizontal movement of the rods. into a tripping' and non-tripping` position with respect to a series of latch-es depending upon the enee;ization of the electromagnetwhich is en ized in accordance with the character of the impulses received.

Serial No. 531,337.

The selecting,` rods are, duringA the period of their selection, rotatable by power communicated to a' shaft common to the selecting' rods through a friction clutch. but subsequent to the release thereof and just prior to the engagement of the tripping fingers with the series of latches. a. positive drive connection is established between the driving' and driven shafts.

rEhe recording` mechanism comprises, among` other parts, a flexible metal ring or wheel. on one side of which the type representing' the letters of the alphabet, numerals, punctuation marks and other special characters which are necessary for the printingr of a message, are embossed. The wheel or ring is rotatable in either direction. and through the shortest arc between respective characters so as to bring the desired type in alignment with the printing hammer which, when operated, forces the ring' with the type against the paper tape, the printing of adjacent characters being prevented by a flexible shield. The type wheel is rotated by means of a rack and pinion normally under tension by a helical spring and driven through a series of pivoted levers which are moved. by crank levers under the control of a series of rotatable shafts for imparting to the type wheel a definite and predetermined degree of rotation. The series of shafts is controlled by the .latches operated by the tripping lingers.

This invention may be considered as an improvement upon the invention described and claimed in my copendinp; application, Serial No. 432,953, filed December 9.4L, 1920.

Referringto the drawings:

Fig. 1 is a perspective view of the mecha-` nism as assembled:

Fig. 2 is a vertical sectional View with a portion of the casing removed;

Fig. 3 is a plan view with the top removed;

Fig'. t is a vertical sectional view with the ribbon feeding mechanism removed;

Fig'. 5 shows the printer as viewed from the left-hand side;

Fifi. 6 is a perspective view of a portion of the select-ing mechanism:

Fig. l illustrates the method of positioningthe selecting rods;

Fig'. 8 is a plan view of a portion of the auxiliary selecting; mechanism;

Fig. 9 is a detail view showing the shape of the releasing cams and theirI position with respect to the selecting rods;

Fig. 10 is an end view of the structure shown in Fig. 8;

Fig. 11 shows the mechanism ot Fig. 1() in its inoperative position; l

Figs. 12 and 13 illustrate two positions ot the auxiliary select-,ing mechanism;

Figs. 14 and 15 are sectional vicwsshow in g the manner ot' release and stopping ot the shaft with which the selecting elements rotate;

Fig. 1G is a perspective ot a portion o't the driving gears;

Fig. 17 is a detail view 0l the type wheel;

Fig. 18 is a view taken along the broken line 18-18 of Fig. 2;

Fig. 19 shows the various positions ot the stepping pawl tor advancing the paper tape;

Figs. 2O and 21 show two positions ot' the lever arrangement for positioning the type wheel so that 'the characters P and t3; respectively will be in a printing position;

Fig. 22 is a sectional view taken along the broken line 22-22 ot' Fig. 4:

Fig. 23 is a` sectional view taken Yalong the broken line 23-23 of Fig. Al;

Fig. 24v is a detail View ot the positive clutch;

Fig. 25 is a plan view ot the ribbon advancing mechanism in one of its operative positions;

Fig. 26 is a plan view of the ribbon advancing mechanism in another ot its operative positions;

Fig. 27 is a detail view ot the ribbon advancing mechanism looking from the right in Fig. 26;

Fig. 28 is a. perspective view oat a portion of the type ring or wheel showing the farrangement of the flexible shield.:

Fig. 29 is a front view of the parts shown in Fig. 28;

Fig. 30 illustrates the parts ot Fig. 29 on an enlarged scale showing the manner of printing and shielding ofthe `adjacent characters;

Fig. 31 is a. diagrammatic showingl ot the circuit connections with a line relay;

Fig. 32 illustrates an alternative arrangement of Fig. 31.

In Fig. 1 there is shown a perspective view of the printer mechanism having a metal base 1; upon which rests a casing or housing 2` which has `a portion 3 thereof hing-ed for the purpose ot permitting easy access to the printing mechanism. On the top et the casing'2 there is positioned a container 4, in which the tape 34 upon which thochaiacters are to be printed. is positioned.

Referring to Figs. 2 and 4. preterablv the latter; a front view ot the printer' illustrat ing the arrangement of a p`luralit \.Y of piv oted levers 5, V6, 7; 8 and 9; is shown. Each oi these levers is pivoted so that the distance through which they may be moved is diilerent, that: is; upon the movement ot' the lever 5 in either a downward or upward direction, a member 10 will be moved through a givendistance. Likewise, if the levcr 6 is caused to move in either a. downward or upward direction, due to the movement ot the connecting links 12 or 13. the member 1t) will be moved through a distance greater than that caused by the .movement ot the lever 5. By arranging these levers in this n'ianner, the various combinations ot steps necessary tor shitting or moving the type wheel from one position to another so `that the different characters' carried by the type wheel may be brought into aflninting posi tion; are attained. It is thus seen that one ot the'bars is designed to move the type wheel through a distance ot sixteen steps corresponding to a like number ot' characters; a. second one through eightsteps; a third tln'ough four steps, a fourth through two steps, and a litth through one step. It .is thus possible to position the type wheel in alignment with the tape or printing medium and the printing mechanism for the printing o1 any desired letter of the alphabet, numeral or other special character, such as punctuation marks. Each of the bars or connecting links 12, 13 and 30 is arranged with respect to the plate 11, which has slots cut therein corresponding to each of these bars so that an eas-y movement thereof with the least possible amount oft friction results.

As shown in Fig. 22. which is a cross-section taken along' the line 22-22 of Fig. 1, the bars or connecting links are secured to the pivoted levers so that for each movement of the bars 14; 15, 16, 17 and 18. aV resultant movement of the link 12 will be brought about corresponding to the distance through which the associated bar moved. rThe manner of connecting the links 30 and 31 with the pivot to which the pivoted 1ever 5 is connected, differs somewhat front that just described. and which illustrated in Fig. 3. Between the plate. 11 and a surface of the lever 5; there is a washer 32 which holds this lever out of engagement with the member' 11. The bar l30 has one yend formed in the shape of a hook which tits over the end of the pivoted lever 5. while it is held in position by the enlarged portion ot the link 31. the whole combination being held .in position by means ot a pin or other tastcning means 33.

Rigidly secured to the member 10, as shown in Fig. 17. which operates in a vertical plane. is a rack 2G. which has cut on one edge thereof a series o't teeth Ydesigned to Vengage the teethy ot a pinion 2T rigidly secured to a shaft 28. The meshingot the teeth ou the rack 26 with those ot the pinion 2T is maintained by means of a roller Cil citations, such as spacing' without printing` 29. Disposed oppositely to the rack 26 is a second rack 36, which likewise has teeth on one edge thereof, which engage the teeth in the pinion 2". Similarl)7 this rack is held in contact with the teeth on the pinion 27 b v means ot a roller 89. @ne end ot' the rack 3G extends into a hollow member 3S which has iitted therein a` helical springv 8T so that the action ol the helical spring in combination with the rack 36 places a teusion on the pinion 2?' so that during a pore tion of the operation, the rack 26 will have to work against. the torce exerted by the spring ST, thereb)v providing a more posi tive action and permitting ot the more a cu rate positioning; ot the type wheel in align ment with the printing mechanism.

Secured to the shaft 28 is a metallic wheel 4:0, shown in Fig. 19, provided with a rim. having' cut therein a pluralitv7 oit teeth ot various depths, there being' a to-othon the opposite side of each ot the types. rlhe teeth in the rim of' the wheel. el() individual to each of the characters, are all ot the same width and depth. The other teeth are pro vided for permitting various auxiliarv opetc. These teeth are provided tor the purpose ot enabling' the centering ot' the type with respect to the printing mechanism the tape or printing' medium pri to the actual engagement ot the printing' hammer with the type wheel. Sincey it is sometimes desired to cause the advancement ot the tape without causing; the printingot a character. the depth of the teeth are not the saine. Thus, as will be more clearly described hereinafter, the printing' mechanism, owing` to the shape ot some ot the teeth in the rim et the wheel 40, is not, permitted to ,fro to its 'fullest extent for printing the character on the tape, but the mechanism is so arranged that the tape will be caused to advance one step.

Attached to the spokes ot the wheel 40 is a. type rino,` or wheel 41, on one side ot which the various characters are embossed. 'ihe manner or" mountingthe type ringl which is provided with inwardly extendingportions is such that upon engagement bv the printing` mechanism. a portion ot the ring; will be moved forward, and upon its release, will quickl)rv restore to its normal position. -For preventing the printing' or sinudfring the clriraeters adjacent to the one being printed. a tlexible steel ribbon 59, Figs. 28, 29 ai al 30, having an aperture 69 cut therein, which a n d is in alignment with a printingi anvil 5ft atl` tached to a plate 58, which in turn is secured to the upright 5l. is provided. The steel ribbon 59 is attached at its two ends to brackets ('37 and 76 and lies between the inking` ribbon 182 and the paper tape 8l. Upon the engagement of the print n mech anism with a portion ot the type ring, the

paper tape 3l, as shown in Fig. 30, will be bent down over the edges oi the anvil while the inking ribbon 182 willb-e caused to pass through the apertures (39, oneedge ot which is cut in the shape ot a V to prevent cutting' ot' the inking' ribbon and paper tape. o' mechanism shown in Fig-9;. comprises a si le selectin;v magnet #l2 having a pair ot oppositelv disposed coils and ell, which are supported on the trame fil. The coils l-l and ari ar 'angled when energized to effect a movement ot a pivoted armature to which there is secured at one end thereot' a beveled extension t6. Since it is oftentimes desirable to connect the magnet directl)Y in circuit with the line, an cf:- tcnsion is secured to the armature 45, serving' as a fastening` means tor a spring 4l-l?, which extends between the extension pin 1 and he upright 49 secured to the base l. One end et the spring #i8 is Atastened to a rotatable member 50 attached to the upright 49. tlierelr permitting` ot the adjustment ot' tens' in. exerted on the armature hlornirllv when the selecting` magnet is i without the biazfsiui spring 4S. the armature ii-5 lies in central position to the that the beveled extension Afral te a.. pair et de- 'lliese detiectingr l. ion or projection 145,

@electire` rods as shown in Fig'. G. extene horizonlj-,f arr-oss the back ot' the machineand the entr-eine right thereof' bent at' angie ot' amiroimetelv 90 degrees. The vementot the selecting;` bars A=nto their o operative positions is brought about u )on their rotation, as will be more clear-lj;7 u iderstcod from the following; description, bv the positioningl oi the bevelefV prei-ect" n the armature 45 in the path ot their rent, or, in other words, to one side er other ot the central pesi `ion with respect i detiected 57 and 58. ln order the selecting,` rods will be retained in the 'fon set until a subsequent selection ch requires the same to be placed in the -i 't e-ir operative positions, a .semifircnlar disc or locking' vane 68 is mounted :i a manner so that one end thereof, which the extension is beveled. lies in the c ,ntral portion otl the aperture between the deflected fingers 57 and 5S. Thus. it it is eesired to position anv one ot' the selecting` rods, either to the fight or left ot this disc. inV which position theyv will be in an fative position with respect to the other meel anism ot' the printer. the armature 45 musi,- be moved so that the beveled extenlies within the path sion fi-o i i ot' the projection ci the ctxn;T rod next to engage this part to eith the left or the right ol3 the semicircular disc 68, depending upon which of the coils 43 or 44 is energized. Consequently the selecting rod will be moved a distance equal to the thickness of the semi* circular disc 68, which distance is sufficient to permit of the satisfactory operation of the mechanism.

Individual to each of the selecting rods 62 to 66 and rigidly secured thereto, are operating cams or tripping ngers 70, 71, 72, 73, and 74, which are of a shape as shown in Fig. 9, and although the rods to which they are secured are operated successively, they will function simultaneously. Fixed to each of the tripping lingers to 74, is a circular plate 7 5, and beneath which and movable therewithare a plurality of auxiliary selecting bars 78, 79, 80, 81 and 82, thefree ends of which norn'ially rest on a rivet or roller 83. The selecting bar is provided with a` horizontally extending portion 84 so that for certain positions of the other selecting bars, the free ends thereof rather than resting on the roller 83, will rest on the extension 84, thereby setting up a condition identical to that if they were resting or piled up on the roller V83, as shown in Fig. 8.

In order that the selecting rods may be revolved for successively positioning the various cams or tripping fingers in accordance with the energization of the selecting magnet 42 for the desired character to be printed or other selecting purposes.l all five rods are rota-table and freely movable in a horizontal direction in the bifurcated portion of a spoke-shaped member 60, which is rigidly secured to a driven shaft 61. The shaft 61 has power communicated thereto from a continuously running motor 90, through a worm gear 91 secured to the shaft of the motor and a pinion 92. For closing the power circuit of the motor, a snap switch 98 is mounted on the front of the machine. The pinion 92 is secured at one extremity of an operating shaft 93, which has secured at a point intermediate its Iends a beveled gear 94, normally tending to rotate due` to the frictional engagement thereof with the friction discs 96 disposed on each side thereof. The beveled gear 94 engages a similar gear 97 secured to the end of the shaft 61. at the opposite end of which the member 60 is secured. In order to vary the normal pressure between the friction discs 96 and the beveled gear 94, plate 87 with a` horizontal projecting portion having the free end thereof bifurcated, and a helical spring 89 disposed intern'icdiate the plate 87, and a distance nut 88, are provided. Thus, by varying the pressure on the spring 89,- a correspondingr variation in the pressure existingl between the various parts with which it is associated, is produced.

During a. portion of the revolution of the beveled gear 97, especially during the period that the selecting rods 62 to 66 are being positioncd to one side or the other of the semicircular disc 68, depending upon the energization of the Selecting magnet 42, the load on the driving shaft 93 and. consequently on the beveled gear 94 is considerably lighter than that following such positioning of the selecting rods. It is necessary, owing to an increase in load, to provide a positive driving connection between the shaft 93 and the shaft 61, during the period that the tripping fingers 70 to 74. inclusive, function. For providingl this iu it-ive drive connection 'be tween these parts, a loot-hed Wheel is rigidly secured to the shaft 93, and adapted to be engaged by a flexible spring 86 secured to the beveled gear 97, as shown in Fig. 24. The` spring 86 is arranged with respect to the wheel 85 so that the engagement of these two parts is brought about following the setting of the selecting rods and continues until the tripping fingers have functioned, as will be more clearly described hereinafter.

Also secured to the shaft 61 is an irregular shaped stop arm 100, best shown in Figs. 14 and 15, which during' the non-operation of the printer, engages an extension on the member 101 pivoted to the member 102. One end of the member 101 engages the bifurcated portion of a bar 105 pivotally secured to plate 108, to which there is also pivotally secured a latch 106. This latch 106 is normally held in position by a spring 107 secured to a portion thereof and the plate 108. The under surface of the latch 106 has a notch cut therein which is adapted to receive one end of the bar 105, thereby retaining the extension on the member 101 in the path of the stop arm 100. By this arrangement the shaft 61 will be normally held against rotation and will be started upon the initial energization of the selecting magnet 42. The armature 45 is moved tol the left and strikes against the latch 106 thereby raising one end thereof and causing the bar 105 to disengage the notch on the lower surface of this latch for removing the extension on the member 101. out of the path of the stop arm 100. Thus, since power is constantly applied to the shaft 61, as previously described. this shaft will continue to revolve until it is again stopped by the extension on the member 101. Just. prior to the completion of the cycle of rotation of the shaft 61 and due to the engagen'ient of the portion 99 of the member 101 with the irregular surface of the men'lber 100, the member 101 together with the bar 105 and the latch 106 will be restored to their normal position, thereby placing the extension on the member 101 in the path of the stop arm 100. By this arrangement the shaft 61. will be started into operation at the beginning of each signal period and will be automatically stopped following the positioning of the selecting rods necessary for the positioning of a character on the type wheel in align ment with the printing medium and the printing mechanism for eii'ecti ng the printingof the desired character.

it is often desirous to permit the orientation of the stop member with respect to the driven shaft- `so Jthat the period intervening between the time that the initial impulse is received and the setting of the first selecting rod may be varied in order that the receivino mechanism will be in synehronism with the transmitting apparatus. rThis, in the )resent machine, is accomplished by providing a vertical member 1011, pivoted to the rod 103 to which the member 102 is secured, By loosening the screw 77, the member 104v may be moved either to theright or left a distance determined by a circular slot formed in a portion of this member.v rlfhus, since the member 101 is pivotally secured to the member 102, the time intervening between the release of the stop arm 1GO and the engagement of the first selecting rod with the beveled extension 416 on the armature 45, may be varied while the printer is in operation.

Referring again to Fig. 6, mounted on the plate 110 and just in front of the cams or tripping lingers to 71, inclusive, is a series of U-shaped members 111 and 1.12, which have pivoted thereto release latchesl 113 and 114i. rlhese latches are pivoted to the U- shaped members 111 and 112 in a manner so that they are positioned side by side, one bcing pivoted to the upper part of these members while the other is pivoted to the lower part thereof, and are thus operated independent of trie other. They are held in their normal positions by a coiled spring 115. These latches, during the period that the printer mechanism is at rest serve to retain a shaft individual thereto against rotation. The latches 113 and 114 are arranged to be ino-ved out of the path of the projection on the shaft individual thereto by the cams or tripping fingers 70 to 74, depending upon the position of the corresponding selecting rod, and are a nged will be more clearly described her ina-fter to permit of the rotation of the corresponding shaft through a half cycle or an angle of 1800.

Corresponding to each set of release latches and extending horizontally from the back of the machine to the front thereof are operating shafts 117, 118, 119, 120, 121 and 122. Each of these shafts, as previously described, have one extremity thereof bent so las to engage one or the other of the release teeth of vhich the teeth in the corresponding gear wheel secured to the adjacent shaft. Disposed on each side of these gear wheels is a disc of friction material 126 and 12T, the former of which is secured by means of a plate 123 having a horizontally extending portion, the free end of which is bifurcated and is secured in place by a locking nut 124-. 1n order that the pressure between the disc 126 and the gear wheel 128 may be varied for different load conditions, a helical spring 125 is placed intermediate the plate 123 and the locking nut 124. rlhus, by varying the position of the locking nut 124 en the associated shaft, the tension of the spring 125 may be varied. Disposed on the opposite side of the friction disc 127 is a gear wheel 129, which is rigidly secured to the respective shafts. rlhis gear wheel has teeth arranged thereon for but a small portion of its circun'iference for the purpose, as will be more clearly described hereinafter, of forming a positive drive connection between the driving means and the shaft with which it is associated.

Beneath each of the gears 128, as is more clearly shown in Fig. 16, an idler 132 fixed lo the horizontal extending members 133 and 1,3#1 and engaging the teeth in the gears 129, is provided for taking care of an increase in load. The idlers are held rinly in engagement with the teeth in the respective gears by a spring 130 secured at a vpoint intermediate its ends in a manner to ci: rt an upward pull on the shafts to which the idlers are secured. Power is communicated to the gears 128 and the idlers 132 and their associated parts, as shown in Fig. 3, through a gear 136 rigidly secured to the shaft 93, which drives the gears 128 through an intermediate gear 135, which serves to re'- versc the direction of rotation of these gears with respect to the main driving gear 136. lt is thus seen that since power is continuously applied to the shaft 93 from the constant-ly running motor 90, these gears will likewise be continuously revolved, but owing to the engagenient of the projection on one end of the respective shafts with either the latch 113 or 114e, these shafts are prevented from rotating but will, however, rotate the instant they are released due to the frictional association of these gears with the friction discs 126 and 127.

ilse secured to the shaft 93 is a gear wheel 137, which like the gear wheel 128, drives an idler let, shown in Figs. 5 and 18. Disposed on one face of the gear wheel 13'? is a disc of friction material 147 which also engages a second gear wheel 138, and which has teeth formed thereon for only a small port-ion of its circumference for providing a positive drive connection between the idler 146 and the teeth thereon. To the oppositeface of the gear 138 there is rigidly secured a circular plate 139, in turn secured to a cam 140 which is normally retained against rotation due to the engagement of a projecvtion of the rod 150, which extends across the back of the machine. Arranged beneath each of the release latches 114 and rigidly secured to the rod 150 is an arm 151, which is operated upon the release of any one of Vthe release latches 114 for causing the rotation of the rod 150 through an angle suliicient to move the extension of the rod 150 out of the path of the cam 140. The cam 140 is fixed to a circular disc of friction material 141, which like the friction discs 126, is held firmly in engagement by means of the plate 143 in combination with the spring 144 and the locking nut 145.

When the extension on the rod 150 is moved out of the path of the cam 140, this cam together with the gear 137 is free to rotate, and since power is communicated to .the friction clutches 141 and 147 from the continuously running motor 90, the gear wheel 137 will be rotated until the extension on the rod 150 again engages the cam 140. Following the release of the rear 137 and the cam 140, as is more clearly siown in Fig. 18, and following the positioning of the operating ylevers 5, 6, 7, 8 and 9, depending upon the particular selection chosen, the cam 140'allows the arm 156, together with the roller 157 secured to one extremity thereof Yto move in a downward direction, thereby causing a similar movement of the pivoted rod 160, which in turn causes the rotation of the irregular shaped rod 159. At one -extremitylof the rod 159 there is secured the @printing mechanism or hammer 155, a portion of which engages the teeth cut in the rim 40 for correctly aligning the type wheel 41 with respect to the extreme end of this mechanism. As previously described, the

.rim ofthe whel 40 is provided with variously shaped teeth. Those individual to the characters are, however, of the same shape so that upon the engagement of the member 155 with the walls of any of these teeth, any slight displacement of the type wheel 41 will be corrected.

'Referring to Figs. 4 and 11, controlled by the selecting rod 64 which carries the cam or tripping finger 72, is an operating cam 1172,*which is arranged to be rendered effective by the engagement of a pivoted bell crank lever 176, upon the positioning of the auxiliary selecting bars 78, 79, 80, 81 and 82 in either theposition shown in Figs. 8 or 13 for causing the operation of the release vlatches 173 and 174, which like the release latches 113 and 114 are normally held by a coiled spring 115. Similarly, these latches control the rotation of the shaft 122, which extends to the front lof the machine and controls the movement of the operating block 20 to which the link 19 is secured. When the 4inem'bers 78, 79, 81 and 82 are moved to the extreme right hand position due to the positioning of the discs 75, with which they are associated, to such a position, the bell crank lever 176 will be fulcrumed on the free end of the member 82 so that upon the rotation of the selecting rod 64, together with the cam 172 controlled thereby, this cam will engage the opposite end of the bell crank lever 176, thereby causing the operation of either the release latch 173 or 174, depending upon whether the selecting rod 64 is positioned to the right or left of the semi-circular disc 68. Upon the operation of either of these release latches, the shaft 122 is permitted to revolve through an angle of 180o, thereby imparting to the block 2O a similar degree of rotation, and consequently causing the .movement of the link 19 and the operating 4lever 9 to a position whereby the type wheel will be shifted from the portion carrying the letters to the portion upon which the figures and punctuation marks are formed, or vice versa, depending upon which one of the latches is released. In cases where it is desired to shift the type wheel from one portion thercotl to another and effect the advancement of the tape one step without causing' the impression of a character, and in one distinct operation the auxiliary member with its extension 84 is arranged so that when the members 78, 79, 81 and 82 are in the position shown in Fig. 12, it is not necessary to eli'cct the movement of all of these members, but only requires the movement of the member 8O by its corresponding disc 7 5. When the members are positioned as shown in Fig'. 13 on the extension 84 rather than the roller 83, a condition similar to that just described will exist upon the rotation of the selecting rod 64, together' with the operating cam 172. From the above description it is apparent that by means of such an arrange ment the type wheel may be shifted through a relatively large angle.

vIt is also possible with the present arrangement to shift the type wheel from one set of characters to another and prevent the operation of the tape advancing mechanism on the same operation. With the auxiliary selecting elements78 and 82 in the position shown in 8, the operating cam 17 2 will be operated for releasing the shaft 122 which causes the type wheel to be rotated through a relatively large angle. Also with the set of tripping fingers secured to each of the selecting rods 62 to 66, the type wheel will be rotated so that one of the shallower cut teeth lies in thevpath' of the printing hamm-er. When the printing hammer is actuated, it is prevented from traveling its fullest extent, due to its engagement with the bottom of the aligned tooth, thereby preventing the operation ot the tape advancing mechanism. It is thus seen that the invention provides an arrangement whereby the ilo type wheel may be shifted from one set of characters to another Without effecting the operation of the tape advancing mechanism.

The mechanism for cansino' the advancement of the tape B1 from a printed area to an unprinted area, as shown in 18, coinprises among' other parts *.et Wheel 177 fixed to a shaft 178 an a stepping` pawl 169, the latter of vhich is secured to one extremity of an operati im' lever 169., which is pivotally secured to the member 16E'. l stepping pawl 169 is norn'ially und tension of a coiled spring 176, having one end thereof secured to the )ping A 169, While the other end is secured to tne member 168. rlhe member 167 cured to the operating rod 117,9 anc. normally tends to move in aJ downvva d oirection due to the action of the spring* 1,65 secured to this member and the bolt 1o6, but owing to the normal position of the operating rod 159, this meniber is previ-ent llowever, upon the ino nent of t ating rod 159, as previously de,l

members 167 and 16d, together with thc stepping paivl 169 will be cai to move in a downward direction, the roi-mor unoci action of the spring' 165.l vvhile the latter 1 pulled down due to the. spring; l stepping pavvl 169 as shown b v t lines in Fig'. 19, moven int-f.)- engagemen with the next succeeding' tooth on the ratche' wheel 177. Following the printing` opera.- tion and the restoration of the operatiin@l rod 1.".9 to normal` the members 167 the stepping pawl 169 are lilrei 'itozed to normal, and due to the engagement o the stepping pavvl with the next succeeding tooth, the ratchet .vheel 177 vfill beca advance one tooth. Also secured shaft 178 is a pair of finch* toothed 179. Just above these wheels is a set of Wheels secured to a roo 1611, may under the et on of sprino 16e; be ino"l in an upward i irection for causing.,Y the c is engag'enient of the teeth in i. o with those in the wheels 9. Fig. y-l-, is secured to vthe rod 1623 and ina-y giving' a` slight turn to the rod 163 after rod has be i raised a .ino-t distance be caused to en; i et lot 199, cut in a lor-.yon ,i the casing' 200 which incloses the rod 1625. "d L) to cause thc ad vanceinentof the tape Without effect-ing` the printing of a character, In the present` invention this feature is accomplished by advancing the type Wheel tl'uiongh the setting of the selecting;v rods in a predetern'iined order, whereby the type *ing will be positioned so that one of the shallowcr cut teeth is in alignment with the printing hammer 155 upon the movement of the printing han'inier asin the case pr viously described. YJvyhen it is desired to adva ice the tape Without printing` a character, the shoulder 116 engages the outer edge of the tooth 1.52, shoivn in Fig. 19. ln this case the members 167 and 168 vill be moved through a distance sufficient to permit the stepping pawi 169 to engage the next succeeding tooth on the ratchet Wheel 177. But mving to the engageinent of the shoulder' 116 with the outer edge of the tooth 152, the extreme extension of the printing hammer 155 will not be permitted to move far enough to engage the type `wheel for the printing of a character. Thus, upon the withdrawal of the printing hamn'ier in a manner previously described, the stepping pavfl 169 will be restored to its normal position against the positivo stop 171, thereby rotatingthe ratchet wheel 17T through a distance equal to one tooth. Consequently the tape will be advanced a similar distance. Should the type wheel be .in a position whereby the shoulder 1.16 on toe printinghan'imer 155 engages the outer edge of the tooth 161, neither printing; nor advancing' of the tape will be ettected since the steppingpavvl 169 not moved 'l'ar enough to permity its engagement with ine next succeeding; tooth, in the ratchet ivhcel 177, as is more clearly shown in Fig. 19 represented by the dotted lines 169A.

rlhe mechanism for r-.dvancing,l the inl;

1thon continuously, as illustrated in Figs. 26, and 27, comprises a pair of ribbon spoons 186 and 181, upon vvhich the inliing ribbon 182 is nv'ound.r and which are arranged one above the other and revolvably supported b v the arms 185 individual thereto. Ii'idividual to each of the spools 1S() and 1.81 are gear Wheels 186 and 187, respectively, which serve upon the engagement thereoi with the teeth in a worin gear 18S secured to a shaft 189 for causing the advancement of the ribbon. Secured to one end of the shaft 189 is a be *eled gear 190, the teeth of which mesh with those of a correspondingl beveled gear 191, which is secured to the shaft 93 driven from the continuously runningI motor 90. As shown in Fig. 27, the shaft. 189 if; mechanically lockerL in a position whereby the teeth of the Worin Aear 18S mesh either with the gear Wheels 186 or 187 depending upon the position of the end of this shaft, with respect to the extending` portion 1.93 of the vertically supported member 192. For preventing the fio/ accidental movement of this shaft from its tivo operative positions, a spring pressed member 194 pivoted to the vertical member' 192 is provided, but Which may be readily moved so as to permit the positioning of the shaft 189 in either of its operative positions. Attached to one end oi the Worm gear 188 is a projection or shoulder 184, which under normal conditions is unrestrained against rotation. Pivotally mounted to the plate to which the member 185 is secured, are members 195 and 196, each ot Which has a slot cut in one end thereof, and through which `the inking ribbon is designed to pass. However, upon the movement ot either of the pivoted members 195 or 196, which are held in their normal posit-ion by a spring 197, due to the engagement by a ball 183 secured at a point near each end ot the ink ribbon, the engaged member will be rotated through an angle sufficient to cause the opposite end thereotl to lie in the pat-h ot the shoulder 184. Thus, upon the continued rotation of the worm 188 and due to the cam action caused by the movement ot the end of the member opposite to the one in engagement with the ball 183 into the path ot the shoulder 184, the shatt 189 will be moved from vengagement with the teeth on one oi the gear wheels 186 or 187 to that ot the other, depending upon which gear wheel the worin gear was previously in engagement with.

As shown in Fig. 2, the ball 183 secured to the ribbon 182 is about to engage one extremity ot the member 195, and upon the cngagrement ot this ball `with this nien'ibcr and due to the 'tact that the slot through which the ink ribbon passes is not large enough to permit the passage ot the ball 183, the member 195 will be rotated a distance su'tticient to cause the lower extremity of this member to engage the shoulder 184, thereby causing the worm gear 185 to disengage the teeth in the gear wheel 187 and engage those in the gear Wheel 186 ior reversing the direction of travel ot the ink ribbon. immediately following the disengagement oi the ball 183 with the men'iber 195, this member will be restored to its normal condition under the action oi spring 197.

The receiving printer hereinbet'ore described is operated preferably by various combinations ot tive selecting current units with an additional impulse preceding 'the selecting units for conditioning what may be 4termed the distributing mechanism 'tor operation. Impulses may arrive over the line and pass through a line relay 202 having bot-h front and back contacts, as clearly shown in Fig. 31. To the tront and back contacts the windings of the coils 43 and 44 are connected. In some cases it may be advisable to eliminate the line relay and use but one set-of coils ot the selecting magnet 42, as is more clearly shown in Fig. 32, and

Vrent.

normally bias the armature of the selecting magnet by the use of the coiled spring 48.

The operation oi the printer mechanism, hereinbefore described, relative to a particular type selection and the operations incident thereto are as follows: For the sake of clearness, let it be assumed that it is desired to select and print the character P. Further assume that the character P comprises the following selecting current units: no current, current, current, no current, and cur- Also assume that the type ring 41 is in a position tor printing the characters of the alphabet.

Preceding the above selecting units it is necessary to transmit a starting unit, which in the preent case amounts to opening the line whereby the line relay 202 is deenergized, thereby causing the energization of the coils 43 ot' the single selecting magnet 42. The energization of the coils 43 of the selecting magnet 42 causes the reversal of the position ot' the armature 45, whereby the release latch 106 is rotated about its pivot, thereby effecting the disengagement ot' the bar 105 with the notch on the under surface ot this release latch. The release ot' the bar 105 causes the member 101 tobe rotated about its pivot a distance sutlicient to move the extension on this member out ofthe :path ot the stop arm 100 secured to the shaft 61.

The instant the member 101 is moved Vin this Y manner, the shaft 61, together with the stop arm is tree to rotate, since, as previously described, power is communicated to this shaft trom a continuously running motor 90 through friction clutches associated with the beveled gear 94.

The first selecting unit of the combination being no current, the line relay 202 remains deenergized, thereby maintaining the coils 43 ot the selecting magnet 42 energized until the position of the armature of `relay 202 is again reversed. The sha-ft 61 together with the selecting rods 62, 63, 64, 65, and 66 now being rotated, causes the projections on these rods to successively engage the beveled extension 46 on the armature 45. Inasmuch as the coils 43 are, for the particular section chosen, energized, the armature 45 will be in a position whereby the projection on the selecting rod 62 will be moved to the right of the semi-circular disc or locking vane 68, thereby causing a similar displacement ot' the cam or tripping linger 70 with respect to the release latches 113 and 114, or in other Words, being in a position upon its continued rotation to operate the release latch 113. Upon the transmission of the second selecting unit, Which consists in applying to the line 203 a source of current, the line relay 202 would be energized, whereby the coils 43 will be deenergized and the coils 44 of the selecting magnet 42 energized for reversing the position ofthe armature 45.

Thus, the beveled extension 46 will be moved to the right so that upon the engagement ofthe projection on the selecting rod 63 with this beveled extension, it will be deflected to the left of the semi-circular disc or locking vane 68. and consequently moving the selecting` rod 63 and the cain or tripping .finger T1 a. distance equal to the width of this disc o1' locking vane. The next selecting unit being current` the line relay 202 will remain energized, thereby retaining the armature in its extreme right position, and consequently the projection on the selecting rod 64 like that of 63 will be moved to the left of the semi-circular disc or locling vane 68. For the next selecting unit the line relay 202 will be deenergized for causing the energization of the coils 43 of the selecting` magnet 42 and the reversal of the position of the armature together with the beveled extension 46. so that upon the engagement of the projection of the selecting rod 65 with this beveled extension, the selecting rod 65 to her with the cam or tripping finger 73 ufill be moved to the righta distance eeual to the thickness of the semi-circular disc or locking vane 68. The last selecting unit consists in applying current to the line, thus causing the energiaation of coils 44- and the reversal of the position of the armature 45. Upon the engagement of the projection on the selecting rod 66 with the beveled extension 46. the rod 66 will be moved to the right and retained in such position until a succeeding selecting unit is transmitted which reverses its position with respect to the semi-circular disc for locl the Following the positioning of the selecting rods in the manner just described, the cams or tripping ngers 70. 71. 72, 7S. and 74 will he in a position just about to operate the corresponding release latch at which time the flexible spring 86. as shown in Fig. 24. will be approaching the teeth in the gear wheel 85. During the operation of the release latches 113 and 11,4. it is necessary to provide a positive drive connection between the shaft 61 and the shaft as at this time the greatest load is exerted on the motor 90. Assume also that the projections on the Vshafts 118, 119. and 121 are in engagement with the upper or release latch 113. while the extension on the shafts 117 and 120 is in engagement with the release latch 114. Then. since but one of the latches 113 and 114 is designed to be released. only bv the operating can'is or tnnping fingersi'fl to T4.. when the correspondingl selecting rod is moved either to the right or left with respect to the semi-circular disc or locking vane 66. the shafts 117 to 121 will be released for rotation .simultaneously upon the engagement of the tripping lingers to 74 with the release latch restraining the respective shaft against rotation. In this case these shafts will be rotated through an angle f 180 degrees due to the frictional engagement of the friction discs 126 and 127 with the continuously runningl gear 128, thereby moving the operating levers 5, 6, 7, and 8 to the position shown in Fig. 20.

For the first few "legrees of rotation of the shafts 117 to 122, inclusive, no appreciable load is applied to the friction clutches, but is only noticeable for approximately the first and last 15 degrees of rotation during which period considerable slippage takes place between the several gears and the friction discs, owing to the increase in load. To obviate this condition, a positive drive is effected bets/een the respective parts by the use, as previously described, of gear wheels which ha ve teeth formed on the periphery thereof for only a portion of the circumference. Thus, during the period of increase in load. the teeth in the gear wheel 129 engage those in the idlers 132, thereby establishing a positive drive connection for lessening` the load on the friction clutches individual to the respective gears 128. The movement of the operating levers 5, 6, 7, and 8, and consequently the lever 9, will cause the rack 26 to be moved together with the pinion 27and the shaft 2S a 'distance to properly position the portion of the type ring carrying the character P in alignment with the printing medium and the printing hammer 155. Upon the operation of any one of the release latches 114, the member 151 pivoted to the shaft 150, is operated, thereby rotating` its associated shaft through an angle sutlicient to cause the removal of the extension thereon from engagement with the cam 140 which is then free to revolve through the frictional engagement of the gear 137 with the friction discs 141 and 14.7. The roller 157, together with the arm 156, upon the continued rotation of the cam 140, falls into the depressed area, more clearly shown in Fig. 18, for causing the rotation of the rod 153. However, just prior or about the time when the roller 157 is engaging the depressed area on the cam 140, the teeth on the wheel 1538, which, as previously described, has teeth thereon for but a small p rtion of its periphery, engage the idler 146 and provide what may be termed a positive drive connection for rotating the cam whereby a more positive action is produced on the rod 153. is the rod 153 continues to rotate. the operating rod 159 is rotated about its pivot so that the printing hammer 155 presses the portion carrying the character l?, as shown in Fig. 30, against the paper tape and thus effects the printing of this character.

Before the character is printed, however, the type ring will be aligned with the eX- treme. end of the printing hammer due to the engagement thereof with the side of the teeth cut in the rim of the wheel 40, as was previously described.

At the time that the printing hammer 155 is printingr the character P on the tape 341, the steppinf,y pawl .169 has engaged the next succeeding tooth of the ratchet wheel 177, so that upon the withdrawal of the printing hammer 155 from engagement with the type ring, the members 167 and 168 will be restored to their normal positions, thereby causing the advancement of the ratchet Wheel 177 through the action of the stepping pawl 169 one tooth. Consequently the paper tape 34 will be advanced to position an unprinted area. before the type wheel lil.

As the stop arm 100 together with the shaft 61 continues its rotation. and j ust prior to the completion of the cycle thereof, the portion 99 of the member 101 engages the irregular surface on. the stop arm 100, thereby causing the restoration of the release latch 106, the operating; liar 105 and the member 101 to their normal positions, oithe position shown in Fig. Thus, before the stop arm 100 has completed its cycle of rotation, the projection on the member 101 will lie in the path of this arm, thereby arresting the rotation of the shaft 61 after it has completed its cycle ot' rotation.

Assuming that it is desired to shift the type ring from the portion carrying the letters of the alphabet to the portion on which the figures or other special characters are mounted, it is necessary to transmit a delinite series of selecting units. Such a series of selecting` units is as follows: current, current, no current, current, and current. rl`he selecting magnet 12 in responding;` to such units, causes all of the selecting rods with the exception of the one carrying' the cam or tripping .finger 7 2. to be positioned to the left with respect to the semi-circular disc or locking vane 68. lith such a setti ng' of the selecting' rods, the auxiliary selecting' members 78. 79, 81, and 82 will be in a position so that the free ends thereof will. be arranged as shown in Fie'. 8. lt is, of course, understood that the stop arm 100 has been released for rotation, as was described in connection with the positioning of the type ringy 41 for the print-ing of the character P. As t-he shaft 61 continues to rotate following,r the setting' of the selecting' rods in the manner ust described, the lower end of the bell crank lever 176 engages a surface of the member 82, which has been positioned in this manner by the setting of the selecting rods 62, 63, 65, and 66 to the left with re-` spect to the semi-circular disc or locking vane 68. Due to the engagement of the its extreme right position, the latch 17 3 will ment of the extension thereon with the release latch 174, positioned at an angle of 18() degrees from the release latch 17 8. The shaft 122 will thus be revolved 1n a manner similar to that described in connection with i the other shafts. Due to the accumulated elfect produced by the positioning of the operating blocks 20. 21. 22, 23, 24, and 25, the raclr 26 will be moved a distance suiiicient to impart a rotary motion to the pinion 27 such that the type wheel 41 will be rotated through an angle to position the portion of the type wheel carryinpr figures and other special characters in alignment with the print-ing mechanism.

Following the positioning,r of the type ring 4l in the mann-er just described, assume that it is desired to print the numeral 6, the following set of selecting' units would be transmitted: no current, current, no current, eurrent, and .no current. The electromagnet 15) "rg, tions the selecting,Y rods upon their rotation in a manner whereby the respective cams or trilfipinp; lingers 70 to 7 i are in a position with respect to the semi-circular disc 68, so that upon the operation of the corresponding release latch. the shafts 117, 118, 119. 126. and 121 will be rotated so that the rectangular block secured `at one end thereof will assume the position shown in Fig'. 21. lVitlifthe operatinglevers 5,6, 7. 8, and 9 in the position shown in this ligure, the numeral 6 will be in alignment with the projection on the printing' hammer 155. The printing' ofthe numeral 6 is effected in a .manner Similar to that described in connection with the printing' of the character l). A. further description of the operation of the system in this respect is, therefore, considered unnecessary.

.if it is desired to unshift the type ring, as for example, from the portion on which the numerals o1' other' special characters are mounted to the portion carrying the letters of the alphabet, the following series of selecting' units must be transmitted: current, current, current, 'current, and current. As before, the selecting.,T rods 62. 64, 65, and 66 will be positioned to the left with respect to the semi-circular disc 68. Likewise the selecting' rod 64 will be positioned to the left with respect to the semi-circular disc 68. Vl'he selecting rod 641 being' thus moved to the left, the cam 172 upon the engagement thereof with the bell crank lever 176, and due to the arrangement of the auxiliary selecting members 78, 79, 81, and 82 in the position shown in Fig'. 8, the release hitch 174 will he operated upon the continued rotation of the selecting` rods. Consequently the shaft 122,

in responding' to these impulses, posi- Y llU the projection ot which is now in engagement with the release latch 174i, Will be revolved until arrested by the release latch 178 or to the position shown in Fig. 11. Due to the setting ot the selecting rods in the position just described and the rotation of the shafts 117. 118, 119, 120, 121, and 122 to a position whereby the rectangular blocks 22, 23, 24, and are in the position shown in Fig. el, the type ring i1 will be in a position tor the printing of the characters ot the alphabet.

lt oiiten becomes necessary to shitt the type Wheel trom the area thereotl carrying figures or other special characters to the area carrying the letters of t-he alphabet and also advance the tape To accomplish this, it is only necessary to transmit a series ot iinpulses or selecting units whereby the selecting rods will be positioned so that the anxiliary selecting rods 78, 79, 80, 81, and 82 assume a position similar to that ot 13. Thus, as the selectingl rods are revolved, and due to the engagement ott the bell crank lever 17o with the end ot the auxiliary member S2, which is now raised as shown in Fig. 1, the cam 172 will be caused to engage the release latch 174. Consequently7 the sha't't 122 will be free to rotate through an angle of 180 degrees upon the operation ot the release latch 174. ln this manner, the type Wheel 41 Will be rotated through a relatively large angle, that is, the portion ot the type Wheel, carrying the letters of the alphabet will be u positioned in alignn'ient with the printing mechanism. Likewise. the rod 153 will be rotated, as previously described, for causing the stepping pawl 169 to engage the next succeeding tooth in the ratchet Wheel 177 for in'ipartinpto the shaft 178 a degreeot rotation su'iiieient, upon the restoration ot the stepping` pawl to normal, to advance the tape Si. No character is printed as the type wheel is in a position such that the shoulder 116 oit the print-ing hammer 155 engages the tooth 152.

Although the present invention has been disclosed and described in connection with a receivingl printer wherein the characters are printed in a continuous line or on a paper tape, it is, of course. obvious that several ot' the en'ibodiments ot' the invention may be incorporated in receiving printers ot the type conunonly reterred to page printers without departingl from the spirit and scope ot' the invention.

The invention claimed is:

1. ln combination, a type wheel having a solid rim with characters arranged on one side thereof, a plurality ot rotatable selecting members arranged to occupy either oit two positions, means tor retaining said members in their actuated position, means re- Ysponsive to selecting units to permit said membe s to be positioned in predetermined con'ibinations With respect to said retaining meansv` a source ot power nori'nally disconnected 'trom said type wheel, and means controlled b v said selecting members tor connecting said source olf power to the type Wheel to position said tyf-e wheel in a printing position.

iin combination, a type vvheei having a :'olid rim with the chair-:eters arranged ou one eide thereot, a pluralityv et rota-table and horizontally movable selecting members arranged to occuliiy either ot' two positions, a locking rane Jior retainiing said members in their actuated position, an electrounignet having an armature with a beveled extension tor causing;- said selecting members to be deflected to one side or the other ot said locking vane depending upon the enero-ization ot said electron'iagnet, and mechanical means controlled by the positioning ot said inemtor rotating said type ivheel to a printing position.

En conibination. a type wheel having` a continuous p riphery with the characters arranged on one side thereof, a plurality ot rotatable and horizontally movable selecting elenients irranged to occupy either o1 tivo selectable positions. means tending normally to rotate said elements, electromagnetic means operative for permitting; the rotation ot said elements and the subsequent position.- ing thereo't in )n'edetern'iined combinations, and mechanical means controlled by the positioning ot said elements to etiiiect the positioning ot said type Wheel in a printing poit'on depending upon the encrgization of .f electromagnetic means. ei. ln combination, a type Wheel having a solid rim with the characters arranged on one side there-ot, a plurality of selecting eleme ts rotatable in a complete circular path and arranged to occupy either ot' two positions, menrbers carried by each ot said elements, means tendingl normally to rotate sai d elements, a single elect-romagnet operative tor causing the release ot said elements and the subsequent positioning thereo'l1 whereby said members are set in predetern'iined combinations, and mechanical means controlled by the setting of said elements in predetern'iined combinations 'tor causing the positioning ot said type Wheel in accordance with the energization of said electroniagnet.

5. In combination, a plurality ot rotatable, elements arranged to occupy either o't tivo .selecting positions, means tending normally to rotate said elements, electron'ieqnetic means for controlling the release ot said elements and the subsequent positioning thereof in predetcrinined combinations, a tipe Wheel, mechanical means controlled by the setting` oit said elcnients for positioning said type Wheel. printing mechanism, and a flexible shield associated vvith said type Wheel tor preventing the printing ot' adjacent characters on the operation of the printing mechanism.

(5. In combination, a type ivheel having the characters arranged on one side thereof in a single row, a printing medium, an inking ribbon, a flexible shield. having an aperture cut therein in a position central to the ends thereof and linterposed between said inking ribbon and said printingl medium, and a printing mechanism arranged when operated to cause the impression of a character carried by said type wheel on said printing medium without causing the impression of the adjacent characters. 7. In a printing telegraph receiver, a type wheel having the characters arranged on one side thereof in a single row, a printing medium, an inkingl ribbon, a flexible metal shield having an aperture cut therein, and interposed between said printing medium and said inking ribbon, a printing anvil mounted in alignment with said aperture, and printing mechanism arranged to cause the impression of a character carried by said type wheel on said printing medium Without the impression of the characters adjacent to the desired character to he printed.

S. In con'ibination, a type wheel having a solid rim withv the characters arranged on one side thereof in a single row, a member moi/'able through varying distances for causing the. rotation. of said type wheel, actuating means therefor comprising a set of rotatable shafts each arranged by a half revolution thereof to produce a definite and characteristic degree of motion, connecting levers movable in accordance With the rotation of said shafts, and a pivoted lever linked with the connectingr levers for transmitting the cumulative etlects of said shafts to produce a desired cumulative rotation of said type Wheel.

9. In a printing telegraph receiver selecting mechanism responsive to line current impulses, a type Wheel having a continuons periphery with the characters arranged on one side thereof in a single row, a toothed wheelsecurcd tol said type Wheel, means controlled by the selecting mechanism to simultaneously rotate said toothed Wheel and said type wheel to a predetermined point, a printing medium, a striker bar, and means mounted on said striker bar and arranged to engage a tooth in said Wheel for correctly `aligning the type Wheel with respect to the striker bar and printingT vmedi nm.

l0. A printing telegraph receiver comprising a selecting magnet, a pluralityv of movable selecting rods positioned. in accordance with the energization of said magnet, a type wheel having a continuons periphery with two sets of characters arranged thereon in a single row, a printing medium, means for advancing said printing medium, and inechanical .means controlled by said rods for simultaneously shifting said type Wheel from one set of characters to the other and causing the operation of said advancing means,

il. In a printing telegraph reeciver, a type wheel having a `continuous periphery with the characters arranged on one side thereof in a single row, means for .positioning said type wheel comprising a set of interconnected levers of different lengths, a crank for operating each of said levers, a rotatable shaft for operating each of said cranks, a pair of stops for each of said shafts arranged to stop the .rotation of said shaft in either of its two nian'ietrically opposite iositions, and means for selectively tripping one or the other of said stops of each selected set to permita half rotation of the associati-al. shafts, and means linked With sa id system of levers for imparting a rotary movement to said type wheel.

l2. A printing telegraph receiver comprising a plurality of selecting rods, an intermittently revolving shaft associated with said rods, means for normally holding the said shaft together with said rods against rotation, a selecting magnet, means controlled by said selecting magnet for permitting the rotation of said shaft, said selecting magnet being responsive to selecting current impulses for positioning said selecting rods in predetermined combinations in accordance with the desired character, tripping members secured to each of said rods, a type wheel having a continuons periphery with the characters arranged on one side thereof in a single ron', and mechanical means brought into operation by said tripping members to impart to said type Wheel a motion sutticicnt to position the desired character in a printing position.

13. A printing telegraph receiver com prising a printing medium, means for ad- *ancing said printing medium, a selecting lltl magnet. a plurality of movable selecting` ro ls positionedY in accordance With the 4energization of said magnet, a type Wheel having tivo sets of characters thereon, and mechanical means controlled by one of said rods when the remaining ones thereof are in a predetermined position for simultaneously shifting said type Wheel and operatingl said advancing means. i A

14.. In a. printing telegraph receiver, a paper tape, means for advancing said tape intermittently, selecting .mechanism comprising a plurality elements, electromagnetic means for controlling the position of said elements in accordance with the reception of selecting units, a type Wheel arranged with tivo sets of chn'acters, and means controlled by one of said elements when the remaining elements are in a predetermined position for simultaneously shifting said type wheel and operating said tape advancing means.

15, In a printing telegraph receiver, a paper tape, means for advancing said tape intermittently, selecting mechanism comprising a plurality of elements, a single magnet for controlling the position of said elements in accordance with the selecting units received,l a type wheel arranged with two sets of characters thereon in a single row, and means controlled by one of said elements when the remaining elements are in a predetermined position for simultaneously shifting said type wheel and operating said tape advancing means.

16. In combination, a driving shaft, continuously operated power means for driving said shaft, a driven shaft normally driven from said driving shaftthrough a friction clutch, means tending normally to prevent the rotation of said driven shaft, a gear wheel on said driving shaft, and a resilient member secured to said driven shaft and arranged to engage said gear wheel to communicate power from the driving shaft through said resilient member to the driven shaft.

17. In a printing telegraph receiver, a type wheel positioning mechanism comprising a driving shaft, continuously operated power means for driving said shaft, a driven shaft normally tending to rotate, said shaft being normally driven through a friction clutch, a set of rotatable shafts each arranged by a half revolution thereof to impart a definite and characteristic degree of rotation to said type wheel, selectively operable means rotatable with said driven shaft to permit a half revolution of selected ones of said set of rotatable shafts to produce a desired cumulative rotation of said type wheel., and a mechanical coupling established between said driven and driving shafts preceding the release of said set of shafts.

18. In combination, a type wheel positioning mechanism comprising a set of rotatable shafts each arranged by a half revolution thereof to impart a definite and characteristic degree of rotation to said type wheel, a continuously operated power means normally tending to rotate said shafts by power communicated thereto through a friction clutch, means selectively operable to permit a half revolution of selected ones of said shafts to produce a desired cumulative rotation of said type wheel, and a positive connection established between said shafts and said power operative means prior to their completion of a. half revolution.

19. In combination, a driving and a plurality of driven shafts, a train of gears continuously driven from said driving shaft, a gear individual to each of said driven shafts which normally tends to rotate said shaft through a friction clutch, an idler gear corresponding to each of the gears of said train and rotatable therewith, and means rigidly secured to said driven shafts for engaging said idler gears for a portion of the rotation thereof whereby a. positive drive connection is established between the respective parts.

20. In combination, a shaft normally tending to rotate, a .stop member, a stop arm normally engaging said member secured to said shaft and having a curved surface, electromagnetic means, release latch forming a mechanical loclr for said member operated upon the initial energization of said electromagnetic means for moving said .stop member out of the path of said stop arm, and a projection of said stop member engaging the curved surface of said stop arm upon the rotation of said shaft for automatically restoring said release latch and Istop member to normal.

21. In combination, a shaft normally tending to rotate, a stop member, a stop arm normally engaging said member and secured to said shaft, a single selecting magnet, and a release latch operated upon the initial energization of said selecting magnet for moving said stop member out of the path of said stop arm, said stop arm arrano'ed to produce a cam action upon its rotation for auto matically restoring said member and said release latch to normal.

In wit-ness whereof, I hereunto subscribe my name this 18th day of January, A. D.,

HARRY PFANNENSTIEHL.

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