US1583365A - Printing telegraphy - Google Patents

Description

May 4 1926.

1,583,365 H. PFANNENSTIEHL PRINTING TELEGRAPH! Filed April 8, 1922 l0 Sheets-Sheet 1 or: .r

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May 4 1926. 1 ,583,365

H. PFANNENSTIEHL PRINTI NG TELEGRAPHY Filed April 8, 1922 10 Sheets-Sheet 2 May 4 1926.

H. PFANNENSTIEHL PRINTING TELEGRAPHY Filed April 8. 1922 10 Sheets-Sheet May 4 1926. 1,583,365

H. 'PFANNENSTIEHL PRINTI NG TELEGRAPHY Filed April 8, 10 Sheets-Sheet 4 May 4 1926. 1,583,365

- H. PFANNENSTIEHL.

PRINTING TELEGRAPHY Filed April 8,

May 4,1926. V J

H. PFANNENSTIEHL PRINTING TELEGRAPHY Filed April 8, 1922 10 Sheets-Sheet e llill -f; x I

1i 75 2 J ll m? NYE I May 4 1926. 1,583,365

H. PFANNENSTIEHL PRINTING TELEGRAPH! Filed April 8, 1922 10 Sheets-sheet 7 v K W 3. I

% wuullulul l May 4 19 26.

1,5835365 H.PFANNENSTIEH.L

PRINTING TELEGRAPH! Filed April 8, 1922 10 Sheets-Sheet a Patented May 4, 1926..

UNITED STATES PATENT orrlca.

may rraiwnns'rrnnn, or MAPLEWOQD, NEW JERSEY, AssIeNon 'ro wns'rnnx nnnc'rnrc COMPANY, mcoaronarnn, on NEW YORK, N. Y A oonronarron or New YORK.

PRINTING TELEGRAPHY.

To all whom itmay concern:

'Be it known that I, HARRY PFANNEN- STIEHL, ajcitizen of the United States, residing at Maplewood, in the county of Essex,

State ofv New Jersey, have invented certain new and useful Improvements in Printing Telegraphy, of which the following is a full, clear, concise, and exact description.

This invention relates 'to printing telegraph apparatus and partieularly'to a uni-- tary structure comprising a receiving printer and keyboard transmitter.

An object of the invention is to provide a telegraph receiver and transmitter combined as a unit wherein the necessary mechanical functions incident to the operation of the respective parts are performed in a reliable and efiicient manner by mechanism operated positively.

graph printer and transmitter combined in a unitary structure in which the power shafts of both the printer and transmitter are normally under tension, tending torotate, and are controlled by friction clutches which are, in turn, controlled by the respective parts. Another object is to provide-a receiving printer and transmitter wherein the code combinationsof message impulses may be transmitted solely through the instrumeh tality of mechanical movements eitherdirectly to line or through the winding of a relay to control the operation ofthe receiving printer for producing a home record.

The invention, according to one of its embodiments, providesa' receiving printer in combination with a manually operable.

transmitting mechanisnn'having an electroresponsive device responsive either to select- 0 ing units received over a line or to the operation of the local transmiting mechanism; a manually operable transmitter operative solely through the instrumentalities of,mechani-. cal movements, a translating device controlled '45 by the electro-responsive device for translating the effects of such units orimpulses into mechanical movements and recording mechanism operable by such translated effects for causing the printing of the letters 59 of the alphabet, numerals and other special characters on a printing medium.

Another object is the provision of atelerods into a tripping and non-tripping posi- The transmitting mechanism comprises a plurality of manually operable keys which cooperate with slidable members or bars adapted to be moved from their normal positions of rest'whereby rocker arms are p0- sitioned selectively and are arranged to be actuated consecutively by cams to vibrate a single transmitting contact.

The electro-responsive device comprises a 00 single electromagnet having its coils connected' to the line conductor through the single transmitting contact controlled by the transmitting mechanism. This electromagnet responds to all impulses and, upon its initial energization, permits the operation oftlie translating mechanism. a

The translating mechanism is made up of a series of rotatable and horizontally movable selecting rods which are successively brought under the control of the selecting magnet, there being a tripping finger' individual to each rod. The tripping fingers are moved by the horizontal movement of the tion with respect .to a series of latches depending upon the energization of the electromagnet which is energized in response to the impulses received The selecting rods are, during the period of their selection, rotatable by power communicated to a shaft common to thesele'cting rods through a fricti'onclutch, 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.

The 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 charactersnecessary for the printing of a message, are embossed. The w eel or ring is rotatable in either direction through the shortest are to' bring the desired type into alignment with the printin hammer which, when operated, forces the ring with the ty e against the paper tape, the printing of t e adjacent characters being prevented. by a flexible shield. The type wheel is rotggted 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 fingers.

Referring to the drawings,

7 Fig. 1 is a per ective view of the mechanism as assemble 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. 4 is a vertical sectionalview with the ribbon-feeding mechanism removed;

Fig. 5 shows the printer together with the keyboard sending mechanism from the left hand side;

Fig. 6 is a perspective view of a portion of the selecting mechanism;

Fig. 7 illustrates the method of positioning the selecting rods in their two operative positions;

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 their 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 of Fig. 10

in its inoperative position;

Figs. 12 and'13 illustrate two positions of the auxiliary selecting mechanism;

Figs. 14 and 15 are sectional views showing the manner of release and stop ing of the shaft with which the selecting e ements rotate;

Fig. 16 isa perspective of a portion of the driving ears; Y u

Fig. 1 is a detail view of the type wheel;

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

Fig. 19 shows various positions of the stepping pawl .for advancing the paper ta e;

igs. 20 and 21 show two positionsof the lever arrangement for positioning the type wheel so that the characters P and 6, respectively will bein a printing position;

Fig. 22 -is a sectional view taken along the broken lines 2222 of Fig. 4;

Fig. 23 is a sectionalview taken along the broken lines 23'23 of Fig. 4;

Fig. 24 is a detail view of the positive clutch;

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

Fig. 26 is a front view of the ribbon advancing mechanism in another of its operative positions; Fig. 27 is a detail view of the ribbon a'dvancing mechanism looking from the right of Fig. 26;

Fig. 28 is a perspective view of a portion of the type ring or wheel-showing the arrangement of the flexible shield;

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

Fig. 30 illustrates the parts .of Fig. 29 on .an enlarged scale showing the manner of and show the selecting and selectable elements in their non-selecting and selecting positions, respectively;

Fig. 36 is a perspective view of a portion of the apparatus shown in Fig. 31, and

Fig. 37 illustrates the diagram of connections. 1

In Fig. 1 there is shown a perspective View of the printing mechanism in combination with the keyboard sender 6, having a metal base 1 upon, which rests a casing or housing 2, which has a portion thereof hinged for the purpose of permitting easy access to the printing mechanism. In a circular opemng inthe top'of the casing, there is positioned a wheel 3 upon which a paper tape 4 is wound.

Referring to Figs. 2 and 4, preferably the latter, a'front View of the printer illustrating the arrangement of a plurality of pivoted levers 5, 6, 7 8 and 9 are shown. Each of these levers is pivoted so that the distance through'which they may be moved is different; that is,.upon the movement of the lever 5 in either a downward or an upward,

direction, a member 10 will be. moved through a'given distance. Likewise, if the lever 6 is caused to move in either a downwardor an upward direction due to the movement of the connecting link 12 or 13, the member 10 will be moved through a distance greater than that caused by the movement of the lever'5. By arranging these levers in this manner, the various combinations of steps necessaryfor shifting or moving the type wheel from one position to another so'that the difierent characters carried thereon may be brought into a printing position are effected. It is thus seen that one of the levers is designed to move-the type .wheel through a distance of sixteen steps corresponding-to alike number of characters, a second one through eight steps, a v third through four steps, a fourth through two steps and a fifth through one step. It is thus possible to position the type wheel in alignment with the tape or-printing medium and the printing mechanism so that the printing of any desired character of the alphabet, numeral, or other special character, such as punctuation marks may be effected. Each of the levers or the connecting links 12, 13 and 30 is arranged with respect toa plate 11, which has a slot cut therein corresponding to eachof these levers, so that an easy movement thereof with the least possible amount of friction results.

As shown inFig. 22, which is a cross-section :along the line 22- 22 of Fig. 4, the connecting links are secured to the pivoted levers so that for each movement of the links 14, 15, 16, 17 and'18, there will be a resultant movement ofthe link 9, corresponding to the distance through which the associated lever is moved. The manner of connecting the links 30: and 31 with the pivot to which the pivot lever 5 is connected difiers somewhat from that just described. This is illustrated in Fig..23. Between the late 11 and a surface of the lever5, there is a washer 32 which holds this lever out of engagement with the member'll. The link 30 has one end thereof formed in the shape of a hook which fits over the end of the pivoted lever 5, while itis held in position by the enlarged portion of the link 31, the whole combination being held in place by means of a pin or other fastening means 33.

Rigidly secured to the member 10, which operates in avertical plane, is a rack 26, shown in Fig. 17, which has cut on one edge thereof a series of teeth designed to engage the teeth of a pinion 27 rigidly secured to a shaft 28. The meshing of the teeth on therack 26 with those of the pinion 27 is maintained by means of a roller 29. Dis posed 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 27. Similarly, this rack 36 is held in contact with the teeth on the pinion 27 by a roller 39. One end "of the rack 36 extends into a hollow member-38 which has fitted therein a helical spring 37 so that the action of the helical spring in combination with the rack 36 laces a. tension on the pinion27 so that uring a portion of the operation, the-rack 26 will have to work against the forceexerted by the spring 37, thereby providing a more positive action and permitting of a more accurate positioning of the type wheel in alignment with the printing medium and printing mechanism.

Secured to the shaft 28 isa metal wheel 40 shown in Fig. 19 provided with a rim having cut therein a" plurality of teeth of various depths, there-being a tooth on the opposite side of each of, the types; The

teeth in the rim of the wheel 40 individual to each of the characters are all of the same width and depth. The other teeth are provided for permitting of the various auxiliary operations such as spacing without printing, etc. These teeth are provided for the purpose of enabling the setting of the type 'wheel with respect to the printing mechanism and the tape or printing medium prior to the actual engagement of the printing hammer with the type wheel; Since it is sometimes desired to cause the advancement of the tape without causing the printing of a character, the depth of the teeth is not the same. Thus, as will be more clearly described hereinafter, the printing mecha; nism. because of the teeth in the rim of the wheel 40, is not permitted to go to its fullest extent for printing the character on the tape-, but the'mechanism is so arranged that the tapewill be caused to advance one step.

Attached to the spokes of the wheel 40 is a type ring or wheel 41 on one side of which the various characters are embossed. The manner of mounting the type ring, which is provided with inwardly extending portions, is such that upon the engagement of the printing mechanism,-a portion ofthe ring will be moved forward and upon its release will quickly 1'estore to its normal position. For prevent-mg the prmtingor smudglng anvil 54 attached to a plate 53. which, in

turn. is secured to the upright 52, is provided. The steel ribbon 59 is attached at its ends to projections 67 and 76 and lies between an inking ribbon 182 and the paper tape 4. Upon the engagement of the printing mechanism with a portion of the type ring, the, paper tape 4,,a's shown in Fi 30, will be bent down over the edges 0% the anvil 54 while the inking ribbon-182 will be caused to pass through the aperture ,69, one

edge of which is cut in the shape of a V- to prevent cutting of the inking ribbon and ,paper tape.

Theselecting mechanism shown in Fig. 6 comprises a single selecting magnet 42 having a pair of oppositely disposed coils 43 and 44 which are supportedon the frame 51. The coils 43 and'44 arearranged, when energized, to-efi'ect a movement of a pivoted armature 45 to one end of. which there is secured a beveled extension 46. Since it is often desirable to connect the magnet directly in circuit with the line, thereby eliminating the use of a line relay, an extension pin 47 is secured to the armature 45 and serves, as a fastening means for a spring 48. which extends between theextension pin 47 and the upright49. Oneend of the spring 48 is fastened to a rotatable member- 50,

' 57 and 58 serve to guide the end of'selecte ing rods 62 to 66. Asshown in Fig. 6, these rods extend. horizontally across the back of the machine, the extreme right end thereof being bent at an angle of approximately 90. The movement of the selecting .rods into their two operative positions is brought about upon their rotation, as will be more clearly understood from the following description by the positioning of I the beveled projection 46 on the armature 45 in the path of their movement, or, in other words,to one side or the other of the central position with respect to the deflecting fingers 57 and 58. In order that the selecting rods will be retained in the position set until a subsequent selection which requires them to be placed in the other "of their operative positions, a semi-circular disc or looking vane 68 ismounted in a manner so that one end thereof, which like the extension is beveled, lies in the central 'ortion of the aperture between the deflecting fingers 57 and '58.. Thus, if it is desired to position any oneof the selecting rods from the right to the left of this'disc in'which position'they -will be in an operativeposition with respect to the other mechanism of the printer, the armature 45- must be moved so that the beveled extension 46 lieswithin the path of the projection on the. rod next-to. engage this part, whereby it is moved either to the left or right of the semi-circular disc 68, depend- 4; ing 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.

erated cams or trippingfingers 70, 71, 72,

73, and 74, shown in Fig. 9, which are of a shape such that though the rods to which they are secured are operated successively, they will function simultaneously. Fixed to each of the tripping fingers to. 74 is a circular plate 75, beneath which and movable therewith are a plurality of auxiliary selecting members or bars 78, 79, 80, 81, and

' 82, shown in Fig. 8, the free ends ofwhich normally rest on a pin orroller 83. The selecting bar 80 is provided with a horizontally extending portion 84 so that for certain positioiis of the other selecting bars, the

free ends thereof, rather than resting on the roller 83, will be positioned on the extension 84, thereby establishing a condition similar to that which would be the case if they were resting or piled up on the roller 83, 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 energization of the selecting magnet 42 for the desired character to be printed or other selecting purposes, the five rods are rotatable 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, shown in Fig. 3, the, power circuit of which may be closed by the actuation of a snap switch 98 secured to the front of the machine, through worm gears91 secured to the shaft of the motor and a pinion secured to the shaft 93. The worm wheel 92 is secured at one extremity of the operating shaft 93. This is secured at a point intermediate its ends to which are secured beveled gears 201 and 94, both of which normally tend to rotate due to the frictional engagement with friction discs disposed on opposite sides thereof. The beveled gear 94 engages a similar gear 97 secured to the end of the shaft 61 opposite to which the member 60 is secured. In order to vary the normal pressure between the friction discs96 and the beveled gear 94, a plate 87 with av horizontally projecting portion having the free end thereof bifurcated,

.erted between the friction disc and one face thereof. a

a As will be more clearly described hereinafter, the beveled gear 201 engages a beveled gear 202 throu h 'whichower is communicated to a sha 239, which drives the distributing mechanism of the keyboard trans: mitter.

i .Connected. to the free end of the operating shaft of the motor 90,- is a governor 203, which serves to regulate the speed of the m0- tor 90- as is clearly understood by those skilled in the art.

' Du'ri-nga portion of the revolution of the beveled gear 97, especially during the period that the selecting rods 62 to 66 are being p0 sitioned to one side or the other of the semicircular disc 68, depending upon the energizationof the selecting magnet 42, the load on the driving shaft 93, and consequently on the beveled gear 94, is considerably lighter than that followingsuch positioning of the selecting rods. It isnecessary, upon an increase of the load, to provide a positive drive eonnection between the shaft 93 and the shaft 61 during the period that the tripping fingers to 74 inclusive function; For providing this positive drive connection between these parts, a tooth .wheel 85 is rigidly secured to the shaft 93, which is adapted to be engaged by a flexible spring 86 secured to the beveled gear 97, as shown in,Fig. 24. The spring 86 is mounted with respect to the wheel 85 so that the engagement of these two parts is broughtabout 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 printers engages an extension on a member l0l-pivoted to a member 102. One end of the member 101 engages the bifurcated portion of a bar 105, pivotally secured to a plate 108 to which there is also pivot-ally 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 normally be held against rotation, and will bereleased upon the initial energization of the selecting magnet 42. \Vhen the armature 45 is moved to the left and strikes against the latch 106, one end of,

this latch will be raised, causing the bar 105 to disengage the notch on the lower surface of this latch and moving the extension on the member 101' out of the. path of the stop arm 100. Thus, since power is constantly applied to the shaft 93, as previously described, this shaft, together with the shaft 61 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 engagement of the portion 99 of the member 101 with the irregular surface of the man-- ber 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 rotation of the stop arm 100. By this ar-.

rangement, the shaft 61 will bestarted into operation at the beginning of each signal period, and will bestopped following the positioning of the selecting rods necessary for the positioning of the character on the type wheel in alignment with theprinting medium and the printing mechanism for effecting the printing of a desired character.

It is often desirous to permit orientation of the stop member with respect to the driven shaft so that the period intervening between the time that the initial impulse is received andthe setting of the first selecting rod may be varied in order that the receiving mechanism will be in synchronism with the transmitting apparatus. This, in the present machine, is accomplished by providing a vertical member 104 pivoted to the rod 103 to which the member, 102 is secured. By loosening the screw 77, the member 104 may be moved either to the right or left a dis.- tance determined by the circular slot formed in a portion of this member. Thus, since the member 101 is pivotally secured to the member 102, the time intervening between the release of the'stop arm 100 and the engage- .70 to 74inclusive, is shown a series 0 U- shaped members 111 and 112, each of which has pivoted thereto release latches 113 and 114. These latches are pivoted to the U- shaped members 111 and 112 in a-manner so that they are positioned side by side, one bev ing pivoted to the upper part of these members, while the other is pivoted to the lower part thereof and are thus operated independently of the other, They are held in their normal position by a spring 115. These latches,

during the period that the printing mecha nism is at rest, serve to retain a shaft individual thereto against rotation. .The latches 113 and 114 are arranged to be moved out of the path of theshaft projection individual thereto by the cams of the tripping fingers 70 to 74 inclusive, depending upon the position of the corresponding selecting rod, and are arranged to permit the rotation of the corresponding shaft through an angle of 180, as will be more clearly understood from the following description.

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 has one end thereof bent so as to engage one or the other of the. releaselatches 113 and 114. At the extremity of' these shafts, there are connected rectangular shaped pieces 20, 21, 22, 23, 24, and 25, to which the respective connecting links 14, 15, 16, 17, 18, and 19 are connected (Fig. 4). the ends-of each of these shafts, there is positioned a gear wheel 128, the teeth of which engage the teeth in the corresponding At a. point intermediate roe gear secured to the adjacent shaft (Fig. 3).

'tive shafts.

ranged thereon for but a small portion of its periphery for the purpose, as will be more 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. In order that the pressure between the disc 126 and the gear wheel 128 may be varied for different load conditions, a helical spriiig 125 is placed intermediate the plate 123 and the locking nut 124. Thus,'by varying the position of the locking nut 124 on 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 respec- Th1s gear wheel has teeth arclearly described hereinafter, of forming a positive drive connection between the driv- 111g means and the shaft with which it is associated. Positioned beneath each of the gears 128, as is shown in Fig. 16, is an idler 132 fixed to the hor zontally extending members 133 and 134, and engaging the teeth of the gears 129, and is provided for taking care of an increase in load following a selection. The idlers are held firmly in engagement with the teeth in the respective gears by a spring 130 secured at a point inter-- mediate its ends in a manner to exert an upward pull on the shafts to which the idlers are secured. Power is communicated to the gears 128 and the idler gear 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 reverse the direction of rotation of these gears with respect to the main driving gear 136. It is thus seenvthat since power is continuously applied to the shaft 93 from the constantly running motor 90, these gears will likewise be continuously revolved, but owing to the engagement of the projection at one end of the respective shafts with either the latches 113 or 114,'these shafts are prevented from rotating. They will rotate, however, the instant they are released, on account of the frictional associa tion .of these gears with the friction discs 126 and 127.

Also secured to the shaft 93 is a gear wheel 137 which, like the gear wheel 128, drives an idler 146 shown in Figs. 5 and 18. Disposed on one face of the gear wheel 137 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 portion on its periphery for providing a positive driving connection between the idler 146 and the teeth thereon. To the opposite face of the gear 138 is rigidly secured a circular plate 13.9 in turn secured to'a cam 140, which is normally retained against rotation because of its engagement by an extension on a rod 150, which extends across the back of the machine, as is clearly shown in Fig. 6. Arranged beneath' each of the release latches 114 and rigidly secured to the shaft 150 is an arm 151, which is operated upon the operation of any one of the release latches 114, causing the rotation of the shaft 150 through an angle sufficient to move the extension on 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, hke the friction disc 126, is held in engagement by means of the plate 143 in combination with the spring 144 and the locking out 145. A

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 wiheel 137 will be rotated until the extension on the rod 150 again engages the cam 140. Following the release of the gear 137 and the cam 140, as is more clearly shown in Fig. 18, and following the positioning of the operating levers 5, 6, 7, 8, and 9, according to the particular selection chosen,

the cam 140 allows arm 156, together with the roller 157 secured at one extremity thereof, to 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 extremity of the rod 159 there is sethese teeth, any slight displacement of the type wheel 41 will be corrected. 1

An operating cam 172, controlled by the selecting rod 64, which carries the cam or tripping finger 72, is shown in Fig. 11. This cam is arranged to be rendered efiec tive upon the positioning of the auxiliary selecting bars 7 8, 79, 80, 81, and 82 in either the position shown in Figs. 8 or 13, by the engagement of a pivoted bell crank 176, causing the operation of the release latches 173 and 174 which, like the release latches 113 and 114, are normally held by a coil spring 115. Similarly these latches control the rotation of the shaft 122, which extends to the front of the machine and controls the movement of the operating block 20 to which the link 19 is secured (Fig. 4). When the members 7 8,7 9, 80, 81, and 82 are moved to the extreme right due to the positioning of the discs 75 with which they are associated to such aposition, the bell crank lever 176 will be fulcrumed at the free end of the member 82 so that upon the rotation of the selecting rods 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 semicircular disc 68. Upon the operation of either of these release latches, the shaft is permitted to revolve through an angle at 180, thereby imparting to the block 20 a similar degree of rotation, consequently causing the movement of the link 19 and the operating lever 9 to a position where 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 rods is operated. In cases Where it is desired to shift the type wheel from one portion thereof to another and to effect the advancement of the tape one step, without causing the impression of a charactor, in one distinct operation, the auxiliary member .80 with its extension 84 is arranged so that when the members 78, 7 9, 80, 81, and 82 are in the position shown in Fig. 12, it is not necessary to effect the movement of all of these members, but only requires the movement of the member by its corresponding disc 75. 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.v From the above description it is apparent that by means of such an arrangement, the type wheel ma .be shifted through a relatively large ang e.

The mebhanism for causing the advance;

ment of the tape 4 from a printed area to a v non-printed area, as shown in Fig. 18, com- 'rises among other parts, a ratchet wheel 177 fixed to a shaft 178 and a stepping pawl 169, the latter of which is secured. to one extremity of an operating lever 168, which is pivotally secured to the member 167. The step- .ping awl 169 is normally under tension of a coile spring 170 having one end thereof secured to the stepping pawl "169, while the other end is secured to the member 168. The member 167 is rigidly secured to the operating rod 159 and normally tends to move in a downward direction due to the action of the spring 165 secured to this member and the rod 166; but, owing to the normal position of the operating rod 159, this member is prevented from movlng. However, upon the movement of the operating rod 159, as pre-- viously described, the members 167 and 168, together with the pawl 169, will be caused to move in a downward direction, the former under the action of the spring 165, the latter under the action of the spring 170. The

secured to'the shaft 17 8 is a pair of finely toothed wheels 179.. Just above these wheels is a similar set of wheels 162 secured to a rod 163, which, under the action of spring 164, may be moved in an upward direction ,to cause the disengagement of the teeth in the wheels 162 withd'hose in'the wheels 179. A pin 198, Fig. 4, is fixed to the rod 163 and by a slight turn to the rod 163 when this rod has been raised a short distance, may be made to engage a notch 199 out in the casing 200, which encloses the rod 163 and the associated spring 164. The tape 4 is designed to pass between the wheels 162 and-179 so that when the ratchet wheel 17 7 is advanced the distance of one tooth, a corresponding movementof the shaft 178 will be produced, causing theadvancement of the tape 4 through a similar distance. A positive stop 171 is'arranged so that the free end thereof lies in the path of the upward movement: of the stepping pawl 169, thereby preventing the advancement of the ratchet wheel '177 through a distance equal to more than that of one tooth.

It is'often desired to cause advancement of the tape 4 without effecting the printing 'of a character. In the present invention,

this feature is accomplished by advancing the type wheel through the setting of the se-v lecting'rods in a predetermined order wherby thetype ring will be positioned so that one of. the shallower cut teeth is in alignment with the printing hammer 155. Upon the movement of the printing hammer, as in the 'case previously described, when it was desired to advance the tape after the printing of a character, the shoulder 116 engages the outer edge of the tooth 152, shown in Fig. 19,

In this case, the members 167 and 168 will be moved throu h a. distance sufiicient to per mit the stepping pawl 169' to engage the next succeeding tooth on the ratchet wheel 177. But owing to the engagement of the shoulder 116 with the outer edge of the tooth 152,.the

extreme end on theflprinting hammer 155.

will not be permitted to move far enough to engage the type wheel for the printing of a character. Thus, upon withdrawal of the printing hammer in the manner previously described, the stepping pawl 169 will be restored to its normal position against the 116 on the printing hammer 155 engages the outer edge of the tooth 161, neither printing nor advancement of the tape will be caused since the stepping pawl 169 is not moved far enough to permit its engagement with the nextsucceeding tooth in .the ratchet wheel ed to the plate towh-ich the member 185 is y bon.

177, as is clearly shown in Fig. 19 and is represented by the dotted lines 169.

The mechanism for advancing the inking ribbon continuously, as illustrated in Figs. 25, 26, 27, comprises a pair of ribbon spools 180 and 181 upon which the inking ribbon 182 is Wound and which are arranged one above the other and revolvably supported by arms 185 individual thereto. Individual to each of the spools .180 and 181 are gear wheels 186and 187 respectively, which serve upon the engagement thereof with the teeth in a worm gear 188 secured to a shaft 187 for causin the advancement of the inking ribecured to one end of the shaft 189 is a beveled gear 190, the teeth of which mesh with those of a corresponding beveled gear 191, which is secured to the shaft 93 driven from the continuously running motor 90.

As shown in Fig. 27, the shaft 189 is mechanically locked in a position whereby the teeth of the-worm gear 188 mesh with the gear wheel 186 or 187, depending upon the position of the end of this shaft with respect to the extending portion 193 of the vdrtically supported member 192. For preventing the accidental movement of this shaft from its two operative positions, a spring member 194: pivoted to the vertical member 192, is provided, which may be readily moved to permit the positioningof the shaft 189 in either of its two operative positions. Attached to one end'of the worm gear 188 is a projection or shoulder 184 which, under; normal conditions is unrestricted against rotation. Pivotally mountsecured are members 195 and 196 each of which has a slot, shown in Fig. 2, cut in one end thereof and through which the inking ribbon is designed to pass. However, upon the movement of either of the pivoted members 195 or 196, eac'h of which is held in its normal position by spring 197, due to the engagement by a button 183 secured at a point near each'end of the inking ribbon, the engaged member will be rotated through an angle sufficient to cause the opposite end thereof to lie in the path of the shoulder 184. Thus, upon, the continued rotation of the worm gear 188 and due to the cam .action caused by the movement of the member opposite to the one in engagement with the button 183 into the path of the shoulder 18 a predetermined arrangement.

the worm gear 188 will be moved from engagement with the teeth on one of the gear wheels 186 or 187 toengagement with the other gear wheel. I

As shown in Fig. *2, the button 183 secured to the ribbon 182 is about to engage one extremity of the member 195, and. upon the engagement of this button with this member and .due to the -fact that the slot, through which the inking ribbon passes, is not large enough to permit the passage of the button 183, the member 195 will be rotated a distance suficient to cause the lower extremity of this member to engage the shoulder 184, thereby causing the worm gear 188 to engage-the teeth in the gear wheel 187 and engage those in the gear wheel 186 for reversing the direction of'travel of the ink ribbon. Immediately following the disengagement of the button 183 with the member 195, this member will be restored to its nggmal position under the action of spring 1 v In the illustrated embodiment of the invention, the keyboard mechanism, as shown in Fig. 81, is arranged according to an ordinary'typewriter, each key being capable of independently performing the selecting operations required to position selectable elements to produce the desired selecting operations. Each key lever 207 is pivoted to the arm 208 with springs 209 normally tending to elevate the outer end thereof. The springs and pivots, although not shown in detail are similar in construction to the arrangeifi'ent disclosed in Patent No. 1,229,201, which issued January 5, 1917. Each key le ver has, toward the rear end thereof, a knifelike portion 206 serving to move upon the actuation thereof, the selectingelements in varying combinations.

Situated directly above and extending in a direction transverse to the key levers 207, Fig. 31, are six selectable selecting members 211, 212, 213, 214, 215, and 216 and a stationary member 217. The base 208 has secured thereto guide members 218 and 21,9, whichserve to support andguide the mem bers 211 to 216, inclusive. Each of the selecting members 211 to 216, inclusive has on one edge a different arrangement of downwardly projecting beveled edges 220 so that these members will be moved in varying combinations according to the key lever depressed. When any one of the key levers is depressed, the knife edge 206 engages the beveled project-ions 220 on the selecting members so that these members will be moved in a direction transverse to therpo sition of the key levers in accordance with The selecting member 211, however, moves upon the depression of anyone of the key levers for aflecting certain selecting operations and is provided at one extreme thereof with a stop 221 and a member 222 provided just above the stop 221, one surface of which is inclined slightly.

As shown in Fig. 36, each of the selecting members 212 to 216 inclusive, has cut on the upper surface at one end thereof, notches 223 in which an operating link normally rests, there being an operating link indiassociated cams for effecting their movement consecutively.v The cams-and metal discsare held in position by means of bushings 238 and 246 which are rigidly secured to the shaft 239. Normally, the shaft 239, having secured at one extremity thereof a beveled gear 240, which engages a similar gear 241 secured to,a vertically mounted shaft 242 tends to rotate.- Likewise the shaft 242 has secured to the end opposite to that to which the/gear 241 is secured, a second gear 258 which engages a beveled gear 257 driven by power communicated to the beveled gear 202 by the gear 201, as shown in Fig. 5. The

shaft 239 is restrained against rotation by the stop 243 rigidly secured to the shaft 239 engaging thestop 221 which, as previously described, is secured to the selecting memher 211.

Mounted directly above bail 234 and in a position central thereto and arranged to be engaged by. a circular disc 227 is a single transmitting contact 245. This contact 245,

when the shaft 239 is at-rest, en ages a contact screw 247, owing to the bail 234 being raised on account of oneend of the operating link 233 being fulcrume-d on the memher 217 and the other end thereof being in engagement with the associated cam on the shaft 239. The contact spring 245 is also provided with a contact terminal 248, which may be either connected directly to battery or ground, as the case may be, or through the winding of the selecting magnet 42 of the printing mechanism, while the contact 247 may be permanently connected to a line conductor 261 extending to! distant station over which it is desired to transmit the de sired code combinations of message impulses in accordance with the depression of the desired'key 207. The contact 247 may be also connected to the line 261 through a line relay, as shown in Fig. 37." Moreover, the double-polarity system may be used with equally good results in whichthe contact spring is normally in contact with marking battery while spacing battery is connected with the opposite contact and with which the contact'may .be moved to change the polarity of the current applied to the line conductor.

At a point intermediate the ends of the selectable members 212 to 216 inclusive, as shown in Fig. 32, a pair of notches 250 and 251 is out, the intervening portion thereof being formed in the shape of a knife edge to more readily permit of the movement of a downwardly and horizontally projecting portion 256 of a locking bar 252. Bar 252 is pivoted to the rod 253 and has an extending portion which is arranged to be engaged by a cam 255 on the shaft 239. During the period that the shaft 239 is at rest, the project-- ing portion 256 of the member 252 is withdrawn from the slots 250 and 251, thereby permitting of their movement. However, the instant tha the shaft is set in rotation, the projecting ortion 256,v due to the moving of the cam 255 out of engagement therewith and to the actionto a coil spring 254, is drawn into engagement with" the slots 250 'or 251 depending upon the position of the selecting members 212 to 216, inclusive, thereby locking the members in position to preventthe depression of any of the key levers 207, while the shaft 239 is revolving and consequently the mutilation of signals.

The receiving printer hereinbefore described is operated preferably by various combinations of five selecting current units with an additional impulse preceding the selecting units for conditioning what may be termed the distributing mechanism of the receiving printer for operation. Impulses may arrive over the line and pass through the customary line relay having both front and back contacts. .In this case the windings of the 'coils 43 and 44 are connected to these front and back contacts; In some cases it may be advisable to eliminate the line relay and to 'use' but one set of coils of .the selecting magnet 42' asis more clearly shown in Fig. 32 and to normally bias the armature of the selecting magnet by the use of the spring 4'8. v

The operation of the transmitter 1mg printing mechanism hereinbefore describe relative to a particular type selection and theoperations incident thereto are as follows: For the sake of, clearness, let it be assumed that it is desired to transmit and print the character P. Further assume that the character B comprises the following selecting current units: no current, current, current, no current and current. Also assume that the type wheel 41 is in a position for the printing of the characters of the alphabet. The key 207 corresponding to the character P having been depressed, the conimon member 211 is moved in the direction of the arrow, thereby moving the stop 221 ciated with the operating link 233 moves out of the path thereof, thereby allowing the bail 234 with the disc 227 to drop and consequently open the circuit between the contact spring 245 and contact 247, thus transmitting what is known as a start impulse.

The opening of the circuit in this manner causes the deener'gization of the line relay 300, Fig. 37 and the transmission over the line 261 of a start'impulse.

Also immediately following the setting of the shaft 239 into rotation, the member 252 is moved so that the projection 256 engages one or the other of the notches 250 and 251 in the selecting members 212 to 216, inclusive, depending upon the position of these members, thereby preventing their movement until the present selection has been cleared out. Let it also be assumed, for the sake of clearness, that the selecting members 213, 214, and 216 forthe transmission of the selecting units representing the character P, have been moved in the direction of the arrow while the remaining selecting members remain in the opposite position. As'theshaft 239 continues its rotation, the selecting member 212 being in the position shown'in the drawing, the end ofthe operating link 228 remains in the notch of the selecting member 212 so that upon the engagement of its associate cam therewith, the contact. spring 245 will be allowed to disengage contact 247 so that an open circuit condition will be established with the line..

A conditionsimilar'to' that just described will take place upon the engagement of the cam individual to the operating link 231 associated with the selecting member 215. As the shaft 239 continues its rotation, the selecting member 213 having been moved in the direction of the arr'ow, the end of the operating link 229 now rests" upon the upper surface of the selecting member 213 so that -upon the engagement of the associate cam with the link 229, one end of this link will be fulcrumed on the member 213, thereby raising the bail 234 and effecting a closure between the contact sprin 245 and the con tact 247; A condition similar to the one described in connection with the selecting member 213 will be established upon the engagement of the cam individual to the opcrating links 230 and 232, respectively, as

the selecting members are moved so as to form a fulcrum for their respective operating links. It is, of course, to be understood that the line relay 300'responds to such actuation-of the contact spring 245 and causes net'42 causes the reversal of the the corresponding energization, as will be more clearly described hereinafter, of the coils 43 and 44 of the selecting magnet 42 of the recording mechanism, causing the printing of the character corresponding to the actuation of the key levers. In this way a home record is made of the messages transmitted from the keyboard.

Following the engagement of the asso ciate cam with the operating link 232, the cam individual to the operating link 233 causes the bail'234 to be lifted as the other end of this link is fulcrumed on the stationary member 217, thereby closing the contact bet-ween contact spring 245 and contact 247 for transmitting a releasing impulse over the line 261 orinother words, establishing the line to its normal condition. Just prior to the completion of the cycle of rotation of the shaft 239, the 'cam associatedv with the member 252 engages the projection thereof, thereby lifting the projecting portion 256 out of engagement with the notches 250 or 251 and in turn permitting the setting up of a new selection. I

In order to prevent the letters from being repeated should a key lever be depressed for a period longerthan the time required for the shaft 239 with its associated cams to complete one cycle, the member 222 having an" inclined surface, is arranged just above the stop 221 so that should the key lever be scribed,.transmits a starting unit, which, in

the present case, amounts to o eningthe line whereby the line relaj 300 is deenergized, thereby causing theenergization of the coils 43' of the, selectin magnet 42. The energization of the coi s 43 of the selecting magosition of the armature 45 whereby the-.re ease latch 106 is rotated aboutits pivot, thereby cause ing the disengagement of the bar with the notch on the under surface of this release latch. The release of the bar 105 causes the member 101 to be rotated about its pivot a distance sufiicient to move the extension on this member out of the path of the stop arm 100 secured to the shaft 61. The instant the member 101 is moved in this manner, the shaft 61, together with the stop arm 100 is free to rotate since, as previously described, power is communicated to this shaft from a continuously running motor

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