US1232045A - Selective telegraph system and apparatus. - Google Patents

Selective telegraph system and apparatus. Download PDF


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US1232045A US1909530455A US1232045A US 1232045 A US1232045 A US 1232045A US 1909530455 A US1909530455 A US 1909530455A US 1232045 A US1232045 A US 1232045A
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Charles L Krum
Howard L Krum
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Charles L Krum
Howard L Krum
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    • H04L17/00Apparatus or local circuits for transmitting or receiving codes wherein each character is represented by the same number of equal-length code elements, e.g. Baudot code
    • H04L17/02Apparatus or circuits at the transmitting end
    • H04L17/04Apparatus or circuits at the transmitting end with keyboard co-operating with code-bars
    • H04L17/06Contact operating means


0.- L. & H. L. KRuM APPLICATION FILED N00 29, I909.
Patented July 3, 1917.
C. L. 6; H. L. KRUM. SELEGTIVE TELEGRAPH SYSTEM'AND APPARATUS. APPLICATION FILED NOV. 29, 1909.- 1,232,945, Patented July 3, 1917.
M56 I IfivcnZQmm aim a9" jzfn'g 0. L. & H. 'L. mum. SELECTIVE TELEGRAPH SYSTEM AND APPARATUS. APPLICATION FILED NOV. 29. 1909.
Patented Jul 3,1917.
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1,232,045. Patented July 3,1917.
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SELECTIVE TELEGRAPH sYs'rE'r/r AND .arramfi'ds.
Specification of Letters Patent.
Patented July 3, 191a.
Application filed November 29, 1909 Seritil No. 530,455.
To all whom it may concern:
Be it known that we, CHARLES L. Kmart and Howano L. KRUM, citizens of the United States, and residents of the city of 5 Chicago, county of Cook, and State oflllinois, have invented certain new and useful Improvements in Selective Telegraph Systerns and Apparatus, of which the following is a specification.
The invention relates to selective tele graph systems and apparatus and more particularly to printing telegraphs and seeks to provide improved means by which the signals or characters of a message can be transmitted rapidly from one station and received or recorded with certainty at :1V distant station. Further objects of the invention are to provide an improved transmitter and a receiver comprising improved selecting and 0 printing apparatus. The invention consists in the features hereinafter set forth, illustrated in the preferred form and arrangement ,in the accompanying drawings and more"particularly pointed out in the ap- 5 pended claims.
In the preferred form, the transmitter and receiver are combined in a single machine, one such machine being located at each station.
0 In the drawings, Figure 1 is a longitudinal section of the improved apparatus with the base portion of the machine shown in section on the line 1-1 of Fig. 5 and the upper portion of the machine shown in sec- 5 tion on the line 11 of Fig. 9. Fig. 2 is a detail view of the printing mechanism with parts shown in section on the line 22 of .Fig. 9. Fig. 3 is a detail view of the typewheel centering device with parts shown in section on the line 3*?) of Fig. 1. Fig. l is a detail view of the type-wheel inking device. Fig. 5 is an inverted plan view of the base portion of the apparatus illustrating the transmitter. Fig. 6 is a detail view ofa portion of the transmitter, parts being shown in elevation and parts in section on the line 6--6 of Fig. 1. Fig. 7 is a detail view'with parts shown in section on the line 77. of Fig. 6. Fig. 8 is a. detail plan section on'the Fig. 9 is a front elemtion of the upper portion or receiver of the apparatus with the top plate in section. Fig. 10 is a plan section of the upper or re ceiving portion of the apparatus with parts o in section on the line 10-10 of Fig. 9. Fig.
11 is a detail view with parts in section on the line -1l of'Fig. 10. Fig. 12 "-i s an elevation of the right-hand end of the upper or receiving portion of the apparatus. 13 is a vertical section on the line 13-13 of Fig. 12. Fig. 14 is a horizontal section on the line 14.-14 of Fig. 12. i Fig. 15 is a. detail view of the upper centering device for the type mechanism. Fig. 16 is a vertical section on the line 16-16 of Fig. 10. Fig. '17 is a detail section on the line 17-17 of Fig. 10. Figs. 18, 19 and 20 are detail views of three of the selector plates. Fig. 21 is a. diagram of the transmitting, selecting and receiving circuits.
The transmitter is arranged Within the base frame A of the ,machine Which is mounted upon the feet a. The receiving mechanism is arranged within the upper portion of the frame which comprises a bottom plate B, a top plate B and a series of corner posts o extending between and fastened to the bottom and top plates. This upper frame is detachably secured to the base frame A by screws extending through the upper corners of the base frame into the lower ends of the posts 7).
A series ofhorizontal key-levers C are arranged within the upper portion of the-base frame A. At their rear ends, the transmitting keydevers C extend between the downturned teeth of a transverse comb bar 1 secured to the upper rear portion'of the base frame. A fulcrum pin or rod 2 extends through the rear ends of the key-levers and through forwardly-projecting lugs 3 on the comb bar 1 and is held in position by set screws 4: extending through the lugs into ongagement therewith. At their forward ends, the keydevers extend through a transverse opening in the front wall of the base frame and over a forward extension or; A trans? verse guiding'comb bar 5 is arranged at the front portion of: the base frame and the for ward ends of the key levers are upturned and carry a seriesof keys C which are arranged in rows or banks similar to the arrangement of the keys of an ordinary typewriti'ng machine. A transverse bar 6 extends between the sides of the base frame below the key-levers and a series of U-shaped springs 7 extend between this bar and the keydevers C and normally uphold the latter with their forward ends against a transverse member or stop-bar 8 at the upper front portion of the base frame.
In the present system, the characters or ios signals are represented by permutations of a definite number of impulses or" oppos te polarity and in. accordance with the preferred plan,- each character or complete signal. is' represented by a particular permutation of five impulses of opposite polarity and the transmitting keys are arranged'to.
control a set of five signal selecting switches or pole changers. These switches or pole changers are preferably in the form of spring-arms D, (see Figs. 1 and 6) that are mounted at their lower ends upon a transversebar Qarranged above the key-levers and fixed at its endsto a pair of uprights 10. These five pole'cha-ngers are variably operated by the finger-keys to controlthe selection of the different permutations. The
, pair of cross-ba'rsl i that are fixed-at their transmission of the selected permutations is efiected by suitable means as hereinafter set forth. The operation of said transmitter means is controlled or initiated by a sixth spring switch-arm d which is also vmounted on the bar 9 with the set of Eve selecting switches D. The uprights 10 rise from a crossbar 11 which extends above the key-levers C and is supported upon the upperendsof two uprights 12 that extend upwardly,r-each between a pair of .keylevers, from two side-plates or bars 13 (see Figs. 1 and- 2) that extend between and are secured to the cross-bar 6' and the front portion of the base frame A.
The set of switches D and the switch 01 are insulated from their su porting bar 9 and extend upwardly there"rom between a ends to the upper ends of the uprights 10. These bars carry the insulated, adjustable, front and back contact screws for the switch-arms. The contact screws for the set of polechanging switches D on one of the bars 14 are connected to one side of a divided battery and the front contacts therefor on the other bar 14: are connected to the opposite side of the battery. The switcharms D and cl normally engage their back;
contacts, as shown in Fig. 1, and are shifted out of engagement therewith and into engagement with their front contacts by a series of cam disks d which are rotatably mounted upon a transverse support -15 extending between the uprights 1'0 and are provided with cam lugs 16 which are arranged to engage offsets 17 formed in the switches D and (Z. The cam disks id. are insulated fi'om the cross-support 15 and. from a seriw of disks or plates 19 secured to the faces thereof. The cam disks (2 with v the plates 19 secured thereto, are held in a series of spacin proper position on the cross support 15 by sleeves 18. A. series of ,U- are or bails D are arranged below the key levers 6 (see Figs. 1 ant-3. 55), and pivoted at their rear ends upon-lugs 20 fixed to the cross-bar 6. There Lesa pee are six bails in the form shown and they are respectively connected to the insulated disks 19 of the switch-operating cams d I against a series of adjustable stop-screws 26.
These adjustable stop-screws are carried on two arms 27 that are fixed at their forward ends to a transverse bar 28 and project rearwardly therefrom. ".lhe bar 28 extends between the side portions of the base frame A near the forward-end thereof. The outside bail D is connected to the operating cam for the transmitter initiating switch d and the other bails are connected to the actuating camsoi' the pole-changing or permutation selecting switches D. Each key is arranged to operate the outside bail and thereby shift the switch d, and each is arranged tooperate a particular combination permutation of impulses or code signals which represents the character of that particular key. The selective operation of the bails by means of the keys is effected by a series of character type C fixed to the keys and each having a series of downwardly extending teeth-29. Each of these character type is arranged to operate the outside bail to thereby shift theswitch d and the teeth 29 of the several type are arranged to operate diiierent combinations of the remaining bails to selectively operate dif-' ferent combinations of the pole-changing switches D; so that permutations of five impulses of opposite polarity may be selected by the switches D andthe selected perm1 '1 tations transmitted to the line.
While the movement of the keys is initiated' by the operator; the shift thereof is preferably completed by a combined actu -ator and lock-out in theiorm of, a transverse universal bar E. This universal bar is angular in cross-section and is fixed at its ends to a pair of upright pins 30. These pins are pivoted at their lower ends upon of the other bails to so operate the set of switches D as to select a combinatlon "or a the forward ends oftwo crank-arms 31 that are mounted upon the ends of atransverse shaft 32' journaled in theside-plates 13. The upper ends of the pins 30 extend through openings in two fixed guideilugs 83, so that the, pins andthe universal bar E move in Valillflfil. direction. An arm 34: on.
. the crQssrSiifait-SQ;isconnected to oneend'of a spring 35. The opposite end of the spring is connected to an adjusting screw 36' mounted on a lug 37 on one of the side-plates 13. This spring holds the shaft 32 and universal bar E in normal position with lugs 38 on the ends of the universal bar engaging adjustable stop screws 39 that are carried by the fixed lugs 33. The upper end of the arm 34 is engaged by a horizontal actuating rod c which is arranged to slide through a bar 40, as stated, and is held in adjusted position relatively thereto by a lock-nut 41. A spring 42 coiled about the rod extends between the cross-bar 6 and a collar 43 on the rod and holds the end of the rod against the upper end of the arm 34 on the shaft 82. The circuit of this magnet is controlled by the switchd which, as stated, is operated whenever any key is shifted, so that the magnet E will be energized to shift the rod 6 and thereby, through the medium of the connections described, pull down the universal actuator bar E. The key levels are coupled to the universal bar E by a series of latchesie which are pivoted thereto and depend therefrom infront of the transverse bar 28.'- A set of springs 44 extend between thekey-levers :of the latches to normally 'press the latter toward the cross-bar 28 and away from the actuator bar E. The lower ends of the latches extend throu h a comb bar 45 attached to the lower e ge ofthe cross-bar 28, and at their extreme lower ends, the latches are provided with fdrwardly projecting lugs 46. The backedges of the latches areiprovided with cam lugs 47 which coiiperate with the beveled upper edge of the transverse bar 28, when the keys are depressed, to force the latches forwardly against the tension of the springs 44 and thereby move the lugs 46 thereon below the lower edge of the actuator bar E. The preliminary shift of any key is sufficient to bring the latch thereon in this manner into engagement with the actuator bar and is also sufficient to shift the switch d and thereby energize the magnet E. The magnet then shifts the universal actuating and lock-out bar E to complete the shift of the selected key and character type C mounted thereon and, as the bar E moves. down'in front of the'ends of the latches e of the remaining keys, the latter are locked against operation until the magnet E is dener- 'gized andreleases the actuator bar E and the selected key to permit the latter to be restored to pormal position. The circuit of the magnet E is held closed until the transmission of the selected signal is completed, so that by this arrangement it is impossible to cause the signals to overlap on the line circuit by any excessively rapid operation of the keys. merely initiates the operation of the keys, the touch is light and such as to permit the, rapid operation'of the keys in transmitting a message.
To provide a uniform tension on the keylevers and bails operated thereby, a crossshaft 48 is journaled in the side-bars or plates 13 and is provided withforwardly projecting arms 49 see Figs. 1 and 5) having outwardly projecting pins 50 on their ends which extend beneath theside-arms of the several bails. A depending arm 51 on this shaft is connected by a spring 52- to a stud on one of the 'side plates 13. The ten- Moreover since the operator sion of this spring is applied to all the bails to one of the sidebars or plates 13. By adjusting the screws 54 and 56 the resistance to the depression of the keys at the lower ends of their movement can be adjusted. This spring serves to throw back the keys quickly and give a desired repulser action thereto that assists the operator in rapidly manipulating the keys. 7
Besides the regular keys, the key-board of the transmitter is provided with two special 'keys 58 and 59 (see Fig. 5) for transmitting special signals to effect the carriage return and line'space mechanisms of the printing mechanism. A space key or bar 60 is mountedon two arms 61 that are pivoted at their inner ends) to depending clips 62 on the cross-bar 8. flhe space-bar or'key is arranged to engage a stop-pin 63-upon the forward extension'a" of the base frame and one of the arms 61 thereof is provided with a pin 64 that is arranged to engage the forward end of a special'key-lever G lit-having a proper type thereon to send a special combination to effect the letter-space, fe d of the printing mechanism to thereby forii'n the spaces between the words of the message.
The key-board is also provided with two other special keys F F for effecting the jupper case or capitals and figure shifts of the printing mechanism. The key-levers f f of these keys are arranged at one side of the series of key-levers C, but are not provided with character type C to operatethe its 20 tween the uprights 66.
35 gaging a stop-plate M /plates 70 of the cam disks.
5.5 through slots in a pair of guide bails D. These key-levers are arranged to operate two special switch-arms f and 7 (see Figs. 6,7 and 8) which are mounted upon but insulated from a pair of lugs 65 on he lower ends of two uprights 66. These iiprights are mounted on the left-hand end of the transverse bar 11 and are connected at theirlupper ends by two transverse bars fiT which carry the. adjustable, insulated, front and back contact screws 68 for the switch-arms f and i The switch-army is-a pole-changing switch similar to the switch-arm's D, whereas the switch-arm f is arranged to initiatethe operation of the 5 transmitting means and, inthat'respect, is
similar to the switch-arm cl. The switcharms 7" and f are operated by two cam' disks F and F which are rotatably mount-- ed upon a cross support 69 extending be- These cam disks, like the cam disks (2, are provided with lugs 16 arranged to engage ofl'set or bent portions 17 in the switch-arms f and f Each of these cam disks is insulated fromthe cross support 69 and each is provided with inner and outenface plates or disks 70 and '71 secured to the opposite faces thereof butinsulated therefrom as shown. Springs 72 coiled about the cross support 69 or aboutsleeves 3e thereon, are fixed at their outer ends to the slde' uprights 66 and attheir inner ends to the disks or plates 71, so that these actuating cams are held in normal position with stop-pins 73 on the inner face-plates 70 en 74 that is secured to the rear face of a cross-bar 75 extending be tween the uprights 66. The special shifting key-levers f f are provided with shifter arms for the cams F and F Two of these shifter arms 76 and 77 are pivoted to the key-levers f and f'and extend upwardly in front of the cams F and F and are provided with hooks 78 and 79 which are arranged to engage pins 80 and 81 upon the inner face plates 70 of the cams. Two
shifter arms 82 and 83 are pivoted to the 'key levers f and f and extend upwardly behind the cams F and F and are provided with beveled upper end portions es and 85 59 which are arranged to operate the cam disks arranged lugs 88 which form stops to limit the inward movement of theshifter arms toward the disk cams F and F operated thereby. v
The hooks 77 and 79 are bexleled upon 55 their upper faces and are provided with lower abrupt faces so that they engage the pins '80 and 81 upon the down strpke of the keyfiilevers F and F to oscillate the cams F and F and thereby operate the switch-arms f and f The throw of the key-levers is such that the hooks 78 and 79 engage the pins 80 and 81, to operate the cams and move is double and engages both pins 80 and 81 on the down stroke of the key-lever f and thereby operates both cams F and F and both switch arms f and F. The, hook 79 1s arranged to engage only the pin 81 of the cam F and hence only operates the switch arm f .The upper end portions 84: and 85 of the shifter arms 82 and 83 are provided with abrupt upper faces and beveled lower faces, so that these-shifter arms pass idly over-the pins 86 and 87 on the down stroke of the key-levers f and f but engage the pins and rock the cams F and F to shift the switches f and f on the up stroke of the keys. At
i the ends of the up stroke of the keys, the beveled end portions of the shifter arms 82 and 83 are disengaged from the pins 86 and 87 to release ,the disk cams and permit thesprings 72 to restore them to normal position with the stop-pins 73 thereon in engagement with the plate 7 4. The upper end portion 85 of thevshifter arm 83 is double and is arranged to engage bothpins 86 and 87 on the up stroke of the key-lever f and thereby-shift both switch arms f and f whereas the upper. end portion 84 of the shifter arm 82 is single and operates only on the pin. 8741f the cam F so that the switch is alone'operated. 'By reason of this-arrangement the key-lever f will shift both switches and f on its down stroke and the switc f alone on its up stroke, while thekey lever f will shift'the f alone on its down stroke and both the switches f and f on its up stroke. At the end of the up and down strokes of either key, store the cams to normal position. These switches, as hereinafter set forth, are arranged to transmit special signals to shift the type mechanism to thereby press capitals and figures and to restore the printing mechanism so that lower case letters will be printed. These special key-levers f and f do not, as stated, operate the bails D neither are they operated by the common ac tuator bar E, so that when one of the special keys is shifted it does. eration of the other keys of the machine.
springs 72 rev not prevent the op- When the operator desires to transmit capiin a'manner similar to the ,operatipn of the he depresses one or the other' resents shift mechanism of an ordinary typewriter, the depression of the shift key, as stated, sending the proper combination to effect the shift of the type'mechanism at the receiver, and the release of the key pending the proper combination of impulses to restore the type mechanismll hile the operation of one of the character keys ddesnot lock out the shift keys, it is desirable to provide means to prevent the simultaneous ophration of both shift keys. For this purpose, the comb bar 5, through which the keylevers extend, carries an interlocking disk 90 on its face (see Fig. 6) which is connected thereto by a screw 91 extending through a transverse slot in the disk. The comb bar is also preferablyprovided with two pins 92 which engage the upper and lower edges of the disk. The disk is so ar ranged, with reference to the key-levers {Z and j" that, when one isdepressed, the dis is shifted laterally to a slight extent and locks the other key-lever against operation until the depressed shift key has been restored to normal position. The special shift keys f and f are upheld in normal position by two cushion springs 93 (see Figs. 1 and 5) extending between these key-levers and a. lug 94. on one end of the transverse bar6.
The frames on the transverse bar 11 which support the switches D, (Z, f and and their operating cams extend upwardly through an opening in the front part of the bottom plate B of the upper portion of the frame, as shown in Fig. 1. The rotary operating cams, with the lugs 16 thereon, are so arranged that the initial movement of any of the keys will quickly move the switches to their shifted position and hold them firmly in engagement with their front contacts during the continued movement of the keys "and until the keys are restored to normal position and until the permutation or combination of impulses selected by the operation of any key has been transmitted to the-line circuit. 1
The top plate B of the machine is provided witha pair of upwardly projecting side-plates or brackets 05 l'ietween the upper,
forward portions of which is arranged a horizontal, cylindrical platen G that is v mounted on a shaft 5/, the ends of the shaft bein journaled in the side-plates or brackets 95. he upper, rear P05110118 of the sideplates 95 are pzavided with notches 96 adapted to receive the pintles of a paper roll, as indicated in dotted lines in Fig. 1. The paper is passed to the platen over an inclined guide-plate 07 that engages supports 113 on the side-plates 05. The paper is held in contact with and is 'uided about the platen by two longitudinally extending feed rollers .08 and 00 which engage the under sideof the platen at the front and rear thereof respectively and by two paperguide'fingers 100. The shafts of the rollers 98 and 09 are journaled at their ends in two curved arms 101 which also carry a curved guide-plate 102 intermediate the rollers. The arms .101 are mounted on the forward ends of a pair of spring-arms 103 which are secured'at their rear ends to lugs 101 on the side brackets 95. These arms yieldingly press the feed rollers 08 and 09 against the platen. arms 103 extend through notches or recesses 105 in a rotary releasingrod 105 (see Figs. 1 and 9) that is journaled at its ends in the side brackets 95 and is provided at one end with an arm or finger piece 106. By rotating the rod 105 by means of the linger piece, the forward ends of the springarms 108 are depressed and the feed rollers 98 and 99 are moved away from the platen. The paper fingers 100 are provided with rectangular sleeves 107 that slid-ably engage a supporting nod'108 extending between the side brackets 95 above the platen. The paper fingers extend downwardly and forwardly from the rod 108 about the platen and. their forward, lower ends engage a paper scale 110 that is pivoted at its ends in paper fingers guide the paper as it passes from the front feed rollers 98 up over the front face of the platen and the paper then passes beneath'the rod 108 and over a fixed guide-plate 112 that extends between the side-plates 95.
The long paper guide-plate 97 directs the employed for separate sheets. It is preferably removably mounted in slotted'supports 113 on the inner faces of the s de brackets 95 and when a paper roll is em loyed, this guideplate is removed and the paper passes from the roll over a narrow guide-13121136114 that extends between and is fixed to the side brackets 95.
The shaft 9 of the platen is provided at its ends with the usual finger-pieces g" and on one end it is provided with a line-space ratchet g. A detent arm 115 pivoted on the adjacent side bracket 95 is provided with a roller 116, and a. U-shaped spring 117' engaging the arm normally holds the roller T e forward ends of the spring the front ends of the arms 101. At their paper into engagement with the platen, is
into engagement with the ratchet g'.' 1 i 95, and a spring coiled aboutlthe pivot of the feed pawl g holds it in nrmal position out of contact with the ratchet wheel with an upwardly projecting arm'jg thereon in 5 engagement with the stop pin 119. .An arm 120 on the shaft 118' (see Figs-Land 2), is
arranged to beengaged by the upper end of a-yertical rod 121 which'slides through an opening on the top plate and is adjustably threaded at its lower end into a crossbar 122'that connects the cores G of a double spool, solenoid magnet G Thespools of this magnet are fixed at their upper ends to the top plate B of the machine. A spring 123 coiled aboutvthe upper end of the rod 121 eittends between the top plate and 'a coll a1 on the rod and upholds the latter into engagement with the arm 120.
)Vhe'n a special combination of impulses is transmitted, the magnet Gr is energized to ilraw up the bar 122 and thereby rock the sh ft 118 and the pawls carried thereby toward the ratchet wheel 9. As the arm r stop pawl g is swung away from the stop pin 119, the spring of the feed pawl g throws it into engagement with the ratchet wheel and the further forward movement of the stop pawl g advances theline'space ratchet 9 one notch or until it is engaged,
by the upper, pointed end of thestop pawl 9 The platen and the paper thereon are thereby advanced one step in line space direction.
The type are preferably arranged, as
35. shown, upon a type wheel or carrier H with the lower case letters in one row,-the capitalsln another and the figures and punctuation marks in a third row. In the particuandthelower end of the. shaft 124 is connected by a universalcoupling 126. to. a
short, vertical shaft 127 (see Fig. 9) that is journaled in the carriage. The'carriage is mounted to slide upon two horizontal supporting rods or shafts 128 and 129 that extend between and are j'ournaled in the upper portions of a pair of side-plates or brackets 130 (see Fig. 9) that use from the bottom plate B. The carriage is alsopro- 0 vided with a depending lug131 that engages "a third transverse shaft Z which also extends between and is'journaled in the sideplate 130. The shafts 128, 129 and Z are.
preferably square in cross-section and collars 132, journaled in the lug 131 and m s'ide lugs 133 of the carriage J, engage the shafts-t0 rotate therewith but he flanged r to engage the lugs'132 anrl l33, so thatthey slide along the shafts with'the carriage. A. beveled pinion 134 connected to the iollar are 132 on the shaft Z, engages a beveled pinion 135 on the lower end .of-the short ver tieal shaft 127 so that'the rotation'of the shaft Z will rotate the shafts 1.27 and 12 1' and the type-wheel H to bring the proper 75.- type thereon opposite the printing point on the platen. The type wheel Hand spindle h rotate with the shaft 124 but are free to slide vertically thereon to bring any one of the rows of type on the wheel opposite so the printing point. A c0llar 136 is menu (1' to slide on the shaft 124 and is connected by a pin 137 with the spindle? within the shaft 124, the pin 137 extending through a longitudinal slot 138 in the shaft (see Fig; I 9). The spindle h is thus keyed to rotate with the shaft'l24. To further insure the, rotation of' the type-wheel with the shaft 12 1 but at the same time permit its vertical shift in dependeiitly thereof,.the shaft is provided at its upper end with an arm 139 which extends upwardly through "an eccentric opening in the type wheel. The type wheel is shifted vertically by a fork 140.
which engages-a groove in the collar 136 and is fixed to a shifting-spindle'lel that is arranged to slide through two lugs 142 forme upon the upper and lower portions of the swinging arm j. The lower end of the indie 141 is connected by a link 143 to t e end of a bent arm 144 that extends inwardly from one of the collars 132 on the shaft 129, so that by rotating this shaft the type Wheel can be shifted in vertical direction. It will be understood that the parts 05 of; the type wheel shift mechanism thus far described move with the sliding carriage J Y in letter space direction. Q At its left lhand end, the shaft 129 (see Figs. 1, 2 and 9) isprpvided with a forwardly projecting arm 145 connected by a link 146 to the end of ap arm 147 on a rock shaft h. This shaft is yournaled in two uprights 1 18 that are mounted upon the horizontal portion of an upwardly projecting plate or bracket 149 that is fiXedYtothe bottom plate B. A spring l50 coiled' about 1 the right-hand end of the shaft 129 (see? Figs. 9 and 10) is fixed at its ends to the shaft and to the adjacent side-plate 130 nd normally holds the type wheel shift I mechanism in position with the top row of iloyii'gfease type on the wheel. H opposite painting point and with the arm 147 against a stop-screw 151' (see Figs. 2 and 9), This stopscrew is adjustably' threaded through thelaterally eiitended -end..portion of an upright 152 that rises from the bottom plate 13. v The rock shaft h is provided with a pair 130 of upwardly projecting arms h which are arranged to be engaged by two longitudinally shiftable actuator rods it. These. rods extend through a pair of single spool magnets H and H The frames 153 of these magnets are secured to the upright plate 149 and the magnet projects .rearwardly therefrom. Each of these magnets is provided with an inner, fixed core section 151 through which the actuating rods h loosely extend, and with an outer, movable core sec tion 155 through which the rods are adjustably threaded. Lock-nuts 156 hold the movable core section 155 and the actuating rods it in adjusted relation. Springs 157 on the inner ends of the rods extend between the upright plate 149 and collars on the rods and hold them and the movable core sections 155 in normal position with the inner ends of therods engaging the .arins'iz, on the rock-shaft k. The shift of the actuator rodsand of the movable core section 155 is limited by the engagementof the latter with the fixed core section 15% and by adjusting the movable core sections, the throw of the actuating rods k and the throw imparted thereby to the rock-shaft it can be adjusted,
" and is so arranged that one of the magnets will operate the shift mechanism .to elevate the type wheel one stepand bring the second row of capital letters opposite the printing point, while the other magnet will elevate the type wheel to a sufficient extent to bring the third row of figure and punctuation type opposite the printing point. With the'particular arrangement shown, the magnet H is the capital shift magnet and the magnet H is the figure-shift magnet.
By the operation of the shift-keys F and F" of the transmitter, the proper signals or combinations of impulses are transmitted to select one or the other of these shift magnets H and H and the circuits of these magnets remain closed as long as either of the shift keys of the transmitter is held depressed and is not opened until the depressed shift-key is released to thereby transmit a proper releasing signal.
The shafts 128 and 129 and the sliding carriage J mounted thereon are arranged below the top-plate B of themachine while the pivoted arm j with the type wheelH and shaft 121 mounted thereon extends upwardly through a transverse slot or opening 159 (see Figs. 1 and 9) formed in the top plate. The side-plates 130 within which the shaft 128, 129 and Z are journaled, are securely fastened at their lower ends to the base plate 13 and are connected at their upper ends by a transverse brace-rod 160.
y The type wheel and the type wheel adjusting shaft Z which rotates it, are preferably held in central position and means are provided for rotating the shaft and type wheel in opposite directions from normal point.
. I I to bring the proper type to the printing At its right-hand end, the type wheel adjusting shaft Z is provided with a pinion Z (see Figs. 9, 10 and 12) which is arranged to be engaged by a gear segmerit Z This gear segment is fixed at its lower end to a rock-shaft Z that is journaled at its outer, right-hand end in one of the plates 130 and at its inner, left-hand end in a for wardly projecting lug 161 of an upright bracket 162 that is fixed to the bottom plate B. A transverse arm Z is fixed to the lefthand end of the shaft Z and the opposite ends of this arm are arranged to he engaged by two actuator rods Z thatare arranged to slide through suitable guide openings in the bracket 162 and are adj ustably threaded attheir rear ends to cross-bars-163. These cross-bars are connected respectively to the movable cores L L of two double spool solenoid magnets L and Li mounted on the bracket 162 and projecting rearwardly therefrom. Springs 16 1 are coiled around the actuator rods Z and extend between the face ofthe bracket 162 and collars on the rods to hold the latter and the movable cores of the magnet L and L in position with the forward ends of the rods engaging the cross-arm L The arrangement of these type-adjusting magnets is most clearly shown in Fig. 11. By energizing one or the other of these magnets, the type-adjusting mechanism is shifted to rotate the type-can. rier or wheel H in one or the other direction. After the type-adjusting mechanism and type wheel have been shifted in one or the other direction, they are restored to normal, central position'and are held therein by oppositely-acting spring devices. The
main spring-centering means is connected through the shaft Z and comprises a depending arm 165 fixed to the shaft and nism, the pull of thesprings 166 and 167 thereon are counterbalanced but, as the type shifter mechanism is moved in one or the other direction, the tension 'of one or the other of these springs is increased and the amount to which it is increased is proportional to the extent of shift of the type adjusted mechanism and the type wheel rotated thereby so that, when the rotator magnet L or L is deenergized', the spring centering device will act to quickly restore the type-shifter mechanism and type wheel to its normal position. thus restore the type-adjuster mechanism and type wheel will be substantially the same Whatever the extent of shift of the type wheel has been, since the greater the shift of the type wheel the-greater the amount of tension placed upon one or other of the springs 166 and 167 and the greater effect it will have in restoring the type wheel.
Whilethis spring-centering device acts to: quickly restore the type wheel to central positipn and hold it therein, the effect of the' tw springs in central position is nearly counterbalanced and it would be extremely difficult to so adjust these springs as to accurately hold the type-adjuster mechanism and type wheel in center position. For this reason, a supplemental, more sensitive centering device isprovided. In its preferred form, this centering device comprises two arms or disks17l and 172 that are loosely mounted on the end of theshaft Z that-projects beyond the side-plate 130. A coiled "watch spring 173 is arranged between the disks and is connected at its opposite ends to the hub of the disk 171 and to a pin 114: on the disk 172 near its outer edge. This spring tends to rotate the disks in opposite.
directions and holds the upwardly projecting lugs 175 thereon againsttheopposite sides of a fixed stop-pin 176 that projects from the side-plate 130. The arms 175 onthe disk are also arranged to engage a laterally projecting pin 177 on the upper end of an arm 178 that is fixed to the shaft .Z.
When the type-adjusting shaft Z is rotated in one or the other. direction, one orthe other of the disks 171 or 172 is rotated against the tensionof the spring 173 and, when the rotating magnet. L or L is deenen gized, the spring 17 3 through-the medium of the sh.' ted disk and its lug 1. 5 acts upon the pin\17 7 of the arm 178 to assist in'-restor.-
ing the\shaft Z and the type wheel geared thereto to central position. The restoring central position and thus supplements the action of the main centering springs 166 and 167. The two centering devices together act its extent of shift has been and to hold it in,
to quickly restore the type wheel whatever The time required to the signals or' code permutations.
' having through which the stop pins m project into ma pie central position ready for the next signal, as is of course desirable in order that rapidly transmitted signals can .be received and the corresponding characters printed.
The extent ofrotation of the type adjuster mechanism and type wheel is variably controlled by a set of selectors which are arranged to position a series of stops that engage and arrest a rotating arm connected to the type-adplster mechanism. lVith the particular arrangement shown, there ale four of these selectors that are controlled respectively by a set of four magnets which are responsive to the first four impulses of I k The selectors position two stop devices and the fifth impulse of the signal or code permutation determines the direction of rotation of the type-adjuster mechanism against one or the other of the stops positioned by the selectors.
The stops are preferably in the form of a set of pins on and the selectors are in the form of a series of plates n, n n 'and n differently arranged holes 179 the path of movement of a stop-arm M on the type-adjusting sh'aft-l. The pins are supported on a;sliding carrier which com-- prises two circular plates or disks m secured .together at their upper and lower edges by screws 180 that are. provided with spacing sleeves 181 between the plates. At the opposite side edges, the plates of the pin cari rier are provided with projecting perforated lugs 182 having spacing sleeves 183 between them and which lugs and sleeves slidably engage two horizontal guide-rods 186%. These guide-rods are fixed at their outer ends to the right-hand side plate 130 and project inwardly therefrom. At their inner ends, they.
are connected by a cross-bar 185. -A. fixed plate or disk 186 is provided with side lugs 18? engaging the guide rods ld and fastened to the inner ends of spacing sleeves 188 which extend between the lugs and the right-hand side plate 130. The guide-rods or supports 184& are parallel with and ar-' ranged on opposite sides ofthe'type-adjusting shaft Z, so that the sliding pin-carrier is The plates m of concentric with the shaft. the sliding pin-carrier and the fixed plate 186, and also the crossbar 185 between the ends of the pins 184, are all provided with central openings throughv which the shat Z extends. The'stop-pins m are arranged in .two concentric rows about the shaft Z (see Fig. 17'), 'the pins in the rows being staggored, as "shown. The pins are slidahly mounted in suitable guide openings in the plates m" of the pin'carrier, and a series of springs m coiledabout the pins, extend between the inner plate m and collars m fixed to the outer ends of the pins, so that the pins are yieldingly held in normal posithereby rotate the type-adjusting mechanism and type wheel in one or the other direct on.
There are sixteen different combinations into which the selector disks n of, n and n can be arranged, but only fourteen of these are employed for printing characters.- As
' shown, there are twenty-four of the stopand in twelve of the different settings of.
pins m (see Fig. 17). Twelve-of these pins are arranged on one side of. the normal central position of thestop-arm M and twelve on the opposite side. The'openings 179 in the selector plates are differently arranged the disks-two series of openings therein will be in line to permit twos of the stop-pins to be projected therethrough when the magnet M is operated to shift the pin carrier. \Vhen the type-adjusting mechanism is rotated in one or the otherdirection by either of the magnets L L, the stop-arm M, which is arranged adjacent the outer face of the outside selector" plate, will engage one or the other of the pins and the type wheel will be arrested with the proper-type opposite the printing point of the platen.- It will be understood that in each of these twelve seting, segmental lug 193. The type Wheel can thus be rotated to twenty-six different positionsand, as a special combination or permutation of impulses 15 arranged to operate the printing mechanism without moving the type Wheel rotating mechanism, the normal,
. central position of the type wheel can be employed for printing characters and, as there are three rows of type, eighty-one characters I in all can be printed.
After the proper type is brought opposite theprinting point on the platen, the type wheel is shifted to strike the platen by an arm 212 (see Figs. land 2) which is formed upon one of the collars on the shaft 128 that rotates with the shaft but slides along the shaft with the carriage. This arm is "connected by a link 213 to the rocking arm or frame which carries the shaft 124 and the type whtfel H. At its left-hand end, the
shaft 128 is lprovided with a -crank-arm 72 that is connected by a link p to a rocking arm or leverp pivoted on .theinner face of the left-hand sideplate 1.30. The lever 37 is pivoted intermediate its ends to the crossbar p which connects the movable cores P of a double-spool solenoid magnet P. A spring 214: (see Fig. 10) is coiled about the right-hand end of the shaft 128 and is connected at its ends tothe shaft and to the right-hand side-bracket 130. This spring holds the striking mechanism in normal position with an adjustable stop-pin 215 on the inner end of the crank-arm. 7) in engagementwith a lug 216 on the inner face of the sideplate 130 {see Fig. 2). As soon as the selected type has been brought opposite the printing point, the striker magnet I is energized and rocks the shaft 128 to thereby oscillate the arm J and the type wheel H carried thereby to strike the selected type against the paper on the platen. \Vhen the magnet P is dcenergized, the spring 214 on the shaft 128 restores the striker mechanism and type wheel to iiormal. I
As the type wheel is shifted to the platen, the type opposite the printing point is accurately centered by an arm 217 (see Figs. 1 and 2) which is pivoted to a lug 21,8011 the swinging arm or frame j. The upper end of this arm is arranged between the parts of a bifurcated or' forked lug 219 on the upper end of the centering arm 7' and the extreme upper end of the arm is provided with a beveled edge -which cooperates with the beveled teeth of .a wheel 220 (see Fig. 3) which is fixed to the upper end of the shaft 12 1 and rotates with the type wheel. -The lower end of the centering arm 21? is provided with a pin 221 (see Fig; which en gages a cam slot 222 in an upwardly projecting lug 223 on the carriage J. In the normal position of the type wheel shown in the drawings, the centering arm is held out of engagement with the toothed wheel 220 by the cam lug 223. As the type wheel is swung inwardly against the platen, the pin 221 moves through the cam slot 222 and the latter is shaped to throw the upper end of I the centering device inwardly to engage the teeth of the wheel 220 and thereby accurately center the selected type before it strikes the platen.
A bent arm 22% is fixed to the carriage J and extends upwardly through the slot 159 of the top plate 0 and then rearwardly beneath the platen (see Figs. 1 and 2). An arm 225 is connected by a pivot pin 226 to the rearv end of the supporting arm 22% and the arm 225 extends forwardly from its pivot and thence upwardly and carries an inking roller 227 between the type wheel H and the platen G. The roller is journaled upon a horizontal pin 228 on the upper end 0 of the arm 225 and is removably held in position thereon by a U-shaped spring 229. A spring coiled about the pivot pin 226 holds the arm 225 and inking roller 227 in normal position. As the type wheel swihgs in toward the platen,' it strikes the inking roller, swings the arm 225 upwardly about its pivot pin 226 and against the tension of the spring thereon, so that the inking roller rolls over the selected type and moves up Leashes outof the way so that the {type can strike the platen. The also 225 is provided with a lug 230 having a segmental slot therein v which is engaged bv'a stop-pin fiiil-fixed to the supportlng 311'111 2245 A The crank-arm p on the striker rock-shaft 128 is extended, as shown in Figs. .1 and 2,
i this magnet is secured to the base plate B and projects upwardly therefrom. The switch-arm r carries an insulated spring contact r which is normally held into engagement with an insulated contact screw 7*" by a spring 234:. The local operating circuit for. the printer extends through this normally closed switch. Whenever the striker mechanism is operated to print a selected letter, the arm go strikes the switch arm ,1" and disengages the contacts r and r",
'so that the operating circuit to the. receiver is broken and the parts are restored to normal position and are ready to receive the next signal.
a The switch-arm r is also arranged to be shifted to disengage the contacts r and r by an actuating rod 9* which extends through the core of the single spool solenoid magnet R and is connected to the movable core section R thereof. The actuator rod r and the movable core section R are normally upheld when the magnet R- is deinergized; by a clip 235-iixed to the lower end of the magnet frame and extending beneath the core section. Whenever any one of the five special signals are received Which do not operate the type Wheel, the magnet B. is energized and the operating circuit is broken thereby to permit the restoration of the parts to normal condition.
It should he noted that the type Wheel H has a rotary and an axial movement to select the-desired character and a movement bodily of translation to print the selected type. It also shifts in letter-space direction with the carriage J to print the'successive characters received and to form the spaces between Words. To offset the letter-space feed of the. carriage, a cord 236 (see Fig. 9) is connected to "a forwardly projecting lug 237 thereon and extends horiaontally tovvard the righthand end of the machine. At the righthand end of the machine, a cord 236 passes downwardly over a guide Wheel 238 on the side-plate 130 and rearwardly'over a second guide wheel 239 to Winding drum 2&0 (see Figs. 12, 13 and 14:). This drum is jour- -naled in a bracket 2&1 on the base plate B and is provided with two ratchet Wheels 2&2 and 243 that are arranged to he engaged respectively by the feeding and retaining pawls 244: and 24:5. The retaining pawl 245 is pivotally mounted on. a lug 246 on the base-plate of the bracket 24:1,. and a spring 2&7 (see Fig. 1d) coiled about its pivot normally holds it into engagement with the ratchet Wheel 24:3. The feed-pawl is plvotally mounted upon the end oi an arm or lever 248 which is pivoted intermediate its ends upon a lug on the bracket 2 H,
and is connected at its opposite end by a link 250 to a cross-bar 251 which connects the movable cores S of a doublespool solenoid magnet S Whichis mounted on the bracket 241 A spring 252 extends between the tail of the feed pawl 24A: and a lu 253 on'thc, arm 2&8 and normally presses tie feedpawl into engagement with the ratchet wheel 242. A spring 25 extends between the arm 24:8 and the frame of a magnet S on the bracket 241, and normally holds the arm 2&8 and feed-pawl 244 in position with the rear end of the arm 2&8 engaging an adj ustable stoppin 255 on the base of the bracket 241.
When the magnet S is energized, it draws up the rear end of the arm 248 and moves the feed-pawl 244 back idly over the teeth of the ratchet 242 and places the spring 254: under tension. "When themagnet S is deenergized, the spring 25% restores the parts and the pawl are then acts on the ratchet wheel to lllv'fi-IKCG the drum 240 and, through the medium of the cord 236, to ad Vance the carriage J and type Wheel H mounted thereon one step in letter-space direction. The magnet is energized Whenever the striker operating magnet P is energized, so that the carriage J is advanced one step Whenever the printing mechanism is operated. The letter-space movement oi the carriage, however. does not take place until after the circuit through the magnets P and S is broken. The transmission of a special signal is also arranged to operate the letter-space magnet S without 0 )erating moved in letter-space direction, the cord 25'? 4 rotates the drum 256 and places its spring under tension so that, by releasing the feeding and retaining pawls 24 i and 245 of the Winding drum 24:0. the spring drum 256 will act through the medium of the cord 25,7
to draw the carriage back to the left to commence a new line. The pawls and 245 v are disengaged from the ratchet 2 M and 2-43 by an arm 259 that is pivoted onthe lug 24:6
and is provided. with a cross-pin 260 at its upper end which engages the upper ends of the feeding and retaining dogs or pawls. The arm 259 is provided with a tail-piece 261 which is arranged to be engaged by an actuator rod 262 which extends up through a single-spool solenoid magnet S and is connectedto the movable core S thereof. The rear end of an arm 263 is pivoted to the movable core S. This arm is pivoted intermediate its ends upon a lug 26st on the brackets 241 and the forward end ofthe arm extends over a horizontal rod 265 that extends transversely of the machine between the side plates 130. This rod is longitudinally movable through guide-openings in the plates 130- and is yieldingly pressed toward the right by a spring 266 (see Fig. 9) coiled around the rod and extending between the left-hand side-plate. 130 and a collar 267 on the rod. At its right-hand the rod 265 is provided with iacoilar 268 which'lis normally pressed againstthe side oii the forward end of the arm 263.
The carriage return magnet S is arranged to biz-energized by the, transmission of a special signal. When this occurs, the actuator rod 262 is pushed downwardly to shift the arm 259 and thereby disengage the feed and retaining pawls 2424; and 245 from the winding drum 240. The spring drum 256 is then free to act to return the carriage-to the left. The operation of the carriage return magnet lifts the forward end of the arm 268, so that the rod 265 is'shifted longitudinally to the right by its spring 266 and the collar 268 thereon is moved beneath the forward end of the arm 263 to lock the dog-releasing mechanism and the feed and retaining dogs 2% and 245 in released position. The dogs are thus held in released position, even though the carriage return magnet S is de energized, and they are held in released position until the carriage is fully restored to the left-hand end of the machine to commence a new line. At the end of its movement to the left, a lug 269 (see Figs. 1 and '2) strikes the collar 267 on the rod 265 and moves it longitudinally, to a slight extent,
to the left against the tension of its spring. 266, so that the collar 268 at its right-hand end is shifted from beneath the arm 263. The springs 247 and 252 of the dogs then return them into engagement with the ratchets of the drum 240, so that the letter-space mechanism is again in condition to feed the carriage step-by-step in letter-space direction.
Toiprevent the overthrow of the winding drum 240 when the carriage is returned to the left, it is provided on its inner face with a stop-pin. 270 which is arranged to be en gaged by an arm 271 pivoted on a lug 272 on the base-plate of the bracket 241. 1 A second arm 27 3connected to the arm 272 is also pivoted on the lug 272 and moves with the arm 271; A spring 274 coiled about the pivots of the arms 271 and 27 3, tends to press these arms inwardly with the arm 273 against cord 236 is unwound from the drum 24:0 and v moves from beneath the end of the arm 27 3, so that the stop-arm 271 'is moved by the spring 27 4 back into position toengage the stop-pin 270 and arrest the rotation of the drum 240 and thereby prevent its overthrow.
By preventing the overthrow of the drum 240 the cord 236 is held taut at the end of r the return movement of thecarriage and the feed mechanism is in condition at once to properly feed the carriage 1n letter-space direction.
The cross-bar 211 connectedto the cores- M of the stop-pin shifting magnet M, is arranged to engage a screw 275 that is adjust'ably threaded through the end of a switch-arm m that is pivoted on a lug 276 on the face of the upright plate 201 (see Figs. 9 and 10). iThis switch-arm carries a spring contact in which is arranged to engage a. contact screw m on the lug 276. The switch-arm is spring-pressed to move the contacts into engagement, but the latter are normally held open by the engagement of the cross-bar 211 with the screu 275, but when the stop-pinoperating magnet is en ergized, the cross-bar moves away from the screw and the contacts m and m are brought intoengagement. These contacts are arranged in the energizing circuit of the type-adjusting or rotating magnets L and L".
The first four impulses, as described, control the magnets N N N and Nto set the selector plates n 01. n and n and the fifth impulse determines which of the two rotating magnets L or L is to be energized, and also initiates the operation of the stop-pin shifter magnet M to project the pins through the selecting platesor disks. When this magnet is energized, the contacts at and m are brought into engagement to close the, operating circuit through one or the other of the rotator magnets L and L, so that the type-adjusting mechanism is rotated in one or the other direction until the stoparm M engages one of the projected pins. The operation of either rotator magnet also controls the closing of the circuit through the striker magnet? and the carriage feed magnet S, so that the type wheel isshifted to impress the selected type upon I the'paper'on the platen and the operating circuit is broken by the separation of. the
US1909530455 1909-11-29 1909-11-29 Selective telegraph system and apparatus. Expired - Lifetime US1232045A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2433362A (en) * 1942-03-13 1947-12-30 Standard Telephones Cables Ltd Pendulum relay controlled startstop telegraph transmitter

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US3289806A (en) * 1964-02-29 1966-12-06 Manus George Control system for electric typewriters including current limiting means

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2433362A (en) * 1942-03-13 1947-12-30 Standard Telephones Cables Ltd Pendulum relay controlled startstop telegraph transmitter

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