US1758194A - Telegraph system and apparatus therefor - Google Patents

Description

May 13, 1930. E. E. KLEINSCHMIDT TELEGRAPH SYSTEM AND APPARATUS THEREFOR Filed 0 1924- 3Sheets-Sheet l 9 k E ow V um;

INVENTOR 15 .llll E 1 mm mm on kn 0/ Awe 1 EY May 13, 1930.

' E. E. KLEINSCHMIDT TELEGRAPH SYSTEM AND APPARATUS THEREFOR 1924 5 Sheets-Sheet 2 Filed Oct. 4

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y 1930- E. E. KLEINSCI- IMIDT TELEGRAPH SYSTEM AND APPARATUS THEREFOR 5 Sheets-Sheet s I Filed Oct. 4, l924 on W nmuEII-II'II IIII III-Ill m lu & N Pa II I g lll imlllli .lEa'...

a 'II MI unl lllllmlr Patented May 13, 1930 UN'lTED STATES- nnwann n xnnmscnum'r, or noise ISLAND our, NEW YORK, Assmnoa, 13y mnsu'n ASSIGNMENTS, :ro TELETYIPE oonronarron, or cnrcaao nmmors; A conroming apparatus therefor. adapted for use insingle channel, and m T1011 OF DELAWARE TELEGRAPH sxs'rnm AND APPARATUS 'rnnnnroa Application filed October 4, 1924. Serial No. 741,578.

The present invention relates to improved systems of telegraphy and apparatus therefor.

, More particularly, the invention relates to improved printing telegraph systems and-im proved transmitting, receiving and distribut- The invention is multiplex transmission, either simplex or duplex, and has for one of its objects=the elimination of troublesome rotary distributors, and the usual correcting apparatus. necessary to establish and maintain concordance of action between rotary distributors.

Other objects of the invention are the provision of novel correcting means in which the correcting impulses now commonly utilized are eliminated; and to produce a simplified, reliable system that will function at minimum line frequencies.

Because of the fact that the special correct ing impulses are eliminated, the usual in-, terval utilized in single channel systems of the well known start-stop type for the transfer of selections in the receiver is substantially eliminated.

A further object of the invention is to provide an improved and simplified receiver which is especially adapted for use in the present system, in which an overlap may be attained and in which troublesome clutches are eliminated.

Still other objects of the invention are the provision of a novel transmitter control in which each impulse is timed from the transmitting distributor; andthe provision of a novel tape stop arrangement in which the transmission is controlled by the tension of the tape in a manner to prevent mutilation of signals even though the signals are made up solely of selecting impulses and are not separated by correcting or stop intervals.

Further objects of the inventionare such as may be attained by utilization of the va- Fig. 1 is a circuit diagram showing the invention as applied to a multiplex system. c

Fig. 2 is a fragmental side elevation of the improved tape transmitter.

F i'g. 3 is a fragmental plan view of the transmitter shown in Fig. 2. I

Fig. 4: is a detailplan view of the transmitting finger guides.

Fig. 5 is a fragmental lan view showing the relative positions 0- the transmitting. fingers and the tape perforations.

- Fig. 6 is a detail view showing the tape M ultiplew system i To effect the proper timing of the transrnltters and receivers, .and to distribute the PATENT. orricz impulses properly, tuning forks or vibrating reeds are relied upon and no other distributing means are utilized. The transmitting fork is relied upon as the master timing or pace setting fork, and the receiving fork is controlled by the reversals of line current to remain substantiallyin step with the transmitting fork. To insure a proper control the receiving fork is preferably timed to vibrate naturally at a slightly slower rate than the transmitting fork, and before the amount of phase difference becomes great enough to affect the operation, the vibration of the receiving fork is speeded.

In Fig. 1, the transmittingfork 1 is secured to a fixed support 2 and is provided with tines 3 and 4'upon which are secured adjustable weights 5 and for the purpose of regulating the vibration rate of the fork. Secured to tines 3 and tare insulating contact operating members 7 and 8 whichas the tines 3 and 4 spread and come together, alternately and simultaneously close and permit fixed contacts 9., 10, 11 and12 to open. Connected in series with these contacts is a magnetic drive magnet 13 and a battery 14. To start the fork into vibration, the tines are stressed by hand and released. The movement of the tines outward closes a circuit through magnet 13 which then attracts the tines and draws them inward. As the tines move inward, contacts 9, 10, 11 and 12 separate and de-energize the magnet 13. In this manner the fork is kept in powerful vibration at a uniform and predetermined rate.

Secured to the ends of tines 3 and 4 are insulating contact operating members 15 and 16. Member 15 alternately and successively opens and closes contacts 17, 18, 19 and 20. Contacts 17 and 18 control a circuit including escapement or stepping magnet 21 of a transmitter A, and battery 22, while contacts 19 and 20 control a circuit through battery 22 and escapement or stepping magnet- 23 of a transmitter B. Member 16 alternately and successively opens and closes contacts 24, 25, 26 and 27. Contact 24 is connected to transmitting tongue 28 of transmitter A, contact 27 is connected to transmitting tongue 29 of trans- 'mitter B, and contacts 25 and 26 are connected directly to line conductor. Magnets 21 and 23 control the transmission of impulses, as will more fully hereinafter appear by permitting or causing an impulse to be sent from the transmitters foreach actuation thereof. In the form shown,'magnets 21 and 23 control escapement members 31 and 32 of transmitters A and B which control escapement wheels 33 and 34. Escapement wheels 33 and 34 are mounted upon and control the rotation of pin barrels 35 and 36-which may be controlled as more fully hereinafter set forth in the description of Figs. 3 to 7, to actuate trans mitting tongues 28 and 29 in accordance with code combinations tobe transmitted. It will be understood, however, that the transmitters arenotlimitedtomyimproved pin barrel type, but any of the single contact combination code transmitters may be adapted for use in the system by timing the impulses of the trans mitted signals from the transmitting fork.

'Tongues' 28 and 29 and actuated bet- ween contacts 37, 38, 39 and 40 to apply code combina- I tions of positive and negative impulses from ground 41, batteries 42 and 43, over contacts 24, 25, 26 and 27, to line 30, as will more fully hereinafter appear.

Impulses passing over line 30 actuates polarized line relay 44 in accordance with their polarity and pass to ground 45. Tongue 46 of relay 44 is actuated between contacts 47 and 48 in accordance with the received impulses. Contacts 47 and 48 are connected through resistances. 49 and 50 to the end terminals of a split battery 51. The midpoint of battery 51 is connected to local circuits comprising orienting keys 52 and 53, receiver timing or escapement magnets 54 and 55, polarized selector relays 56 and 57, fork controlled contacts 58, 59, 60 and 61, and

conductor 62 to tongue 46. Tongues 63 and 64:

of selector relays 56 and'57 control local circuits comprising contacts 65 and 66, selecto1 tions to print the desired character as willmore fully hereinafter appear in the description of Figures 8 to 10. Time control magnets 54 and 55 actuate escapement or stepping arms and 76 which control the rota- 1 tion of cam shafts 73 and 74 through escapement wheels 77 and 7 8 or through other suitable arrangements, as will more fully hereinafter appean'.

Contacts 58, 59, 60 and 61 are actuated by an actuating member 79 of insulation secured to tine 80 of receiving fork 81, which in turn is secured to a fixed support 82. Time 83 of fork 81 has secured thereto an actuating member 84 of insulation which actuates contacts 86 and 87 causing engagement thereof alternately and successively with fixed contact 88. Contact 88 is connected in series with a condenser 89 to tongue 46 of line relay 44. Contact 86 is connected through resistance 90 to condenser 89, and contact 87 is connected in series through'slow releasing polarized correcting relay 91 and resistance 50. Armature 92 of relay 91 in attracted position engages a contact 93 and closes an energizin circuit for correcting magnet 94 through battery 95. When magnet 94 is energized, armature96 thereof is attracted and is positioned between projections 97 and 98 of tines 80 and 83, short- I ening the effective length of the tines and speeding up the rate of vibration thereof. A drive magnet 99 for tines 80 and 83 is controlled by a circuit including battery 100 and contacts 101 to 104. Contacts 101 to 104 are actuated by members 105 and 106 mounted on tines 80 and 83.

started by hand. As tines 3 and 4 spread 4 apart, the drive circuit through magnet 13 is completed by closure of contacts 9, 10, 11 and '12, causing the tines to be attracted. As the tines move inward, the circuit through magnet 13 will be interrupted and the tines will again move outward. In this manner the transmitting fork will be set into vibration at a uniform rate, and will connect tongues 28 and 29 to the line causing current reversals to be sent. Operation of the line relay'in response to reversals will attract attention of the receiving operator or for this purpose an ordinary Morse key and sounder may be provided. The receiving operator being apprised of the fact that a message is to be transmitted, starts the receiving fork into vibration by hand. Tines 80 and 83 will then control magnet 99 to -supply driving transmitter A to position tongue 28 for the transmission of the succeeding impulse. At the same time contacts 26 and 27 are closed by tine 4 and tongue 29 of transmitter B is connected to the line 30 to transmit animpulse. As the tines .come together, contacts 17, 18,26 and 27 are opened, and contacts 19, 20, 24 and 25 are closed. The closing of contacts 19 and 20 completes an energizing circuit for magnet 23 causing transmitter B'to position tongue 29 for the succeeding impulse, and the closing of contacts 24 and 25 connects tongue 28 to the line to transmit the impulse from transmitter A. It will be apparent that while an impulse is being transmitted from one transmitter, the other-transmitter is being conditioned fortransmission of the next impulse so that the impulses from the transmitters A and B are alternated in a definitely timed relation determined by the vibration of the fork.

At the receiving station movement of tine 8O outward closes contacts 58 and 59, connecting selecting relay 56 and escapement magnet 54 of receiver A in circuit with tongue 46 of the line relay 44. Energization magnet 54 permits rotation of cam shaft 73 an angular distance allotted to one impulse, and relay 56 simultaneously controls selector magnet 67 to position the cam shaft in accordance with the nature of the received impulse, in this manner effecting a corresponding selective operation in the recelver. In like manner, move- 'ment of tine 80 inward or to the right in Fig.-

1, permitscontacts 58- and 59 to open, and closes contacts 60 and 61. Closure of contacts 60 and 61 connects selector relay 57 and'escapement magnet 55 of receiver B in circuit with line relay tongue 46. Energization of magnet 55 releases cam shaft 74 for rotation through the angular distance allotted to one selective impulse, and relay 57 simultaneous-- ly actuates selector magnet 68 in accordance with'the received impulse.

It will be seen that the receiving fork divides the received impulses alternately between receivers ,A and B. Accordingly, when the receiving fork is operating in properly timed relation with respectto' the transmitting fork, messages from transmitters A and B will be received of the printers A and B respectively.

Synchronization In operation the forks are started vibratriod orcycle during transmission. Tongue -46 of line relay 44 will vibrate between contacts 47 and 48 with the reversals of polarity of the received impulses.- When the receiving fork is in 'sychronism or unison with the received impulses, tine 83 changes position simultaneously and in phase with the changes in position of tongue 46 between contacts 47 and 48. With the receiving fork in synchronism and tongue 46 against contact 47 when tine 83 moves to the right in Fig. 1, contacts 87 and 88 will close completing a charging circuit through condenser 89, tongue 46, contact 47, resistance 49, battery such that polarized armature 92 will not be attracted. As the tine 83 returns to the right in Fig. 1, contacts 87 and 88 will be separated I and contacts 86 and 88 will close completing a discharge circuit for condenser 89 through resistance 90. When tongue 46 shifts to contact 48, tine 83 moves to the right and no effect is produced on condenser 89 or armature 92 while substantial synchronism exists. So long as the receiving fork remains in properly timed relation with respect'to the trans- 'mitting fork, condenser 89 will charge and discharge without causing attraction of armature 92. When the receiving fork is out of the proper phase relation with and drops behind the movements of tongue 46 conditions will arise under which tongue .46 will shift to or engage contact 48 while'contacts 87 and 88 are closed and condenser 89 is charged. Condenser 89 will then discharge throughtongue 46, contact 48, and relay 91,

causing armature 92 to be'attracted. Armationed between pro]ections 97 and 98 of tines 80 and 83. It will be noted that relay 91 is slow'to release and magnet 94 will be held energized for a substantial period of time after the condenser discharge has been completed. With armature 97 held attracted, the effective length of tines 8 0 and 83 is shortened and the speed, of vibration isincreased. If upon the next movement of tongue 46 to contact 48 the receiving fork is still out of synchronism, another discharge from condenser 89 into relay 91 will occur, and this will continue until the fork is again in synchronism. In the form shown, the natural period of free vibration of fork 81 is slightly longer than that of fork 1, i

and with armature 96 attracted, the period is slightly shorter so that in operation the receiving fork will slowly drop behind until the condenseris discharged through relay 91, when it will speed up and come to synchronism. After the forks have been manually started, due to the line reversals the receiving fork will rapidly pull into synchronism.

As the marking and spacing impulse polarities are opposite the channels A and B when no messages are being sent, the current reversals on the line will maintain the forks m unlson. As correctmg impulses can-be received in magnet 91 only when the fork 81 is p Orientation Because the receivers have no normal or unison position from which they may be started at predetermined intervals, it is necessary that some means of orientation or letter finding be provided for use in starting prop- .er reception. This is accomplished by hav:

ing the transmitter or transmitters send test I .messages, and the receiving operator will then momentarily interrupt the operation of escapement magnets 54 and 55 by depression keys 52 and 53, or by holdin armatures 75 and 76, so that the relation of cam shafts 73 and 74 with respectto the incoming impulses will be altered until the proper relation is reached, at which time the receivers A and B or both, will receive intelligible messages.

we The orientation having been effected, regu- Ian transmission may proceed.

For two way transmission the system may be duplexed in any well known manner.

Transmitter A form of transmitter especially adapted for operation in connection with the present system is disclosed in Figures 3 to 7. Pin barrel 35 is provided with a reduced extension 111 which is rotatably and slidably journalled in fixed bearing 112, and has a reduced extension 113 slidably journalled in the end of a shaft 114. Shaft 114 is rotatably supported in bearings 115 and has secured thereto a drive clutch member 116. Spaced at equal angular'distances around pin barrel 35 and spaced laterally along the barrel are five transmitting pins 117 to 121 which' are adapted to co-act with cam projections 122 to 126 to shift. the pin barrel endwise. Secured to shaft 114 and rotatable therewith is a drive connection 127 provided with a drive slot 128 into which pin 121 slidably fits. Cam projections 122 to 126 are formed on extensions 129 of actuating members 130, which are mounted on a fixed pivot 131. Each member 130 is provided with an actuating extension 132 and an individual spring 133 which holds the extensions against cams 134 to 138 which are se cured and rotatable with a cam shaft 139, Pivotally mounted on extensions 129 at points 140 are control or tape fingers 141 to 145, the

upper ends of which extend through and are nest. The tape is inserted between guide block 147 and a plate 152 and is fed by rotation of wheel 151 at a uniform rate. Light springs 153, connected to the fingers 141 to 145, and the extensions 129 individual thereto, normally urge the fingers to the left in Fig. 3. Feed wheel 151 issecured to and supported on a suitablyjournalled shaft 154 which is driven by a gear 155 secured thereto from a pinion 156 secured to shaft- 114. Shaft 139' is suitably journalled and is driven by a gear 157 from a gear 158 secured to shaft 114. Pivotally mounted on pin 159 carried by member 116 is a member 160provided with a tooth 161 which is normally urged into engagement with a driving disc 162 by means of a spiral spring 163 wound around pin 159, one end of which is secured to member 160 and the other end of which engages a pin 164 secured to member 116. Driving disc 162 is provided with a notch 165 into which spring \163 will force tooth 161 in a manner to effect a drive connection between disc 162 and member 116. Disc 162 is formed integrally on a sleeve 166 which is rotatably and slidably Formed on member 160 is a stop trip pro- 'jection 173 adapted to engage a stop trip member 174, and a stop priijection 17 5 adapted to engage a fixed stop 176. A pin 177 secured to member 116 limits the movement of member 160 about its pivot. Stop trip mem ber 174 is pivotally supported on a fixed spindle 178 and is provided with an actuating arm 179. Pivotally secured to the end of arm 179 is a vertically extending link 180 provided at its upper end with ,a pin 181 under which tape 149 is adapted to pass. Pin 181 is positioned between fixed guides 182 over which 4 Secured to mounted slidably on tracted position 186 and 187. Interposed between collar 186 and pinion 183 is a friction member 188. Collar 187 is provided with drive teeth 189 which fit into slots 190 of a sleeve member 191 shaft 185, A spiral spring 193 interposed between collar 187 and member 191 forces a friction disc 194 into engagement with the end face of pinion 183 and supplies the necessary pressure to drive the pinion by friction from shaft 185. Armature 31 of escapement or control magnet 21, in.re-

has the end thereof directly in the path of rotation of projection 84, so that with magnet 21 de-energized, the rotation of pinion 183 and the parts driven thereby will be arrested. The proportions and ar- 'rangement of parts are such that for each from the path of; projection As tape 149 revolution of pinion 183, pin barrel 35 will be rotated through the angular distance allotted to one impulse and for each rotation of the pinion, a complete impulse may be transmitted. With .the clutch parts in the position shown in Fig. 7, the pin barrel is always ar-. rested by engagement of stop projection 175 I with stop 17 6 in the interval between the end of transmission of one complete code combination and the beginning of the next, and tooth 161 can re-engage notch only after an interval of one or more complete code combinations after dis-engagement-is effected. It will of course be understood that any form of escapement control of the rotation of pin barrel .35 by magnet 21 may be substituted for that disclosed. A

Tongue 28 is pivotally mounted at 195, and is provided with an extension 196 which engages extension 111 of pin barrel 35. A spring 197 normally urges tongue 28 into engagement with contact 38 and forces pin barrel35 to the left in Fig. 4.

Operation of transmitter Assuming the tape stop to be in the position shown in Fig. '7 and the transmitting fork 1 (Fig. 1) to be in vibration, as the tine 3 closescontacts 17 and 18, magnet 21 will he energized and will withdraw armature 31 184 .(Fig. 4). 183 for rotation with This will free pinion of shaft 185 is so timed shaft 185. The speed that projection 185 will engage armature 31 just as, or slightly before, th succeeding vibrationof tine 3 closes contacts 17 and 18. For each vibration of.the tine 3, pinion 183 will make one revolution, and gear together with disc 162 will rotate thereby. is tensioned to interpose trip arm 174 in the path of trip extension 173, and stop projection is in abutment with stop 17 6, the rotation of disc 162.will not betransmitted to pin barrel 35. Pin barrel 35 will accordingly remain stationary'with pin 121 just beyond cam 126 and pin 117 just about to pass cam projection 122. In passing cam 126, pin 121 transmits'the last impulse. of a code combination and in passing cam 122, pin 117 transmits the first impulse of a succeedingcode combination. With the pin barrel held" arrested by 'the tape stop in the position set forth, spring'197 will shift thepin barrel to the left in Fig. 4, and will throw tongue. 28- into engagement with spacing contact 38. As above set forth the transmitting tongue Ais being set while the signal from the tongue of transmitter B is being sent, so that an overlap of the operation of the transmitters occurs which permits ample margin for the tape stop operation. It will therefore be clear that the tape stop becomes effective only between completed signals, and the transmitter will always be arrested by the operation thereof in a-manper to impart spacing conditions only to the As the perforator is operated the tension of tape 149 will be relieved and link will drop. This will permit the weight of link 180 and arm 179 to rock trip arm 174 to the left until the end thereof is disengaged from trip projection 173. 'Until notch 165 passes under tooth 161, stop projection 175 will be held in engagement with stop 176 and pin barrel 35 will be held. stationary. As soon, however, as notch-165 passes tooth 161, spring 163 will force member 160 to'the left about pivot 159 and stop projection 175 will be disengaged from stop 17 6. Member 116, shaft 114 and pin barrel 35 will now be driven with disc 162. Rotation of shaft 114 through pinion 156 and gear 155 drives tape feed wheel 151 to advance tape 149 continuously, and through gears 158 and 157 drives cam shaft 139. It is to be noted that member 116 is freed for rotation only when tooth 161 drops into notch .165 and the-proportions and arrangement of parts'are such that this can only occur when projection 184 engages armature 31. After this has occurred, when magnet21 is energized through operation of tine 3, pinion 183 will be released for one revolution, and pin barrel 35 will be rotated the angular distance allotted to the transmission of the first impulse of a code combination by pin 117. Cam shaft 139 will have been so positioned during the preceding impulse that finger141 with the member 130 individual thereto will have been moved upward underthe influence of its spring 133. i If no perforation exists in the tape immediately above the end of finger'141, the tape will stop the upward-movement thereof before cam 122 has moved into the path of pin 117 and as pin 117 rotatespast cam 122, spring 197 will hold tongue 28 against contact 38 causing a spacing impulse to be transmitted. If, however, a perforation exists above finger 141, the finger will move upward through the perforation a suflicient. amount to throw the pin barrel 35 and extension 111 are forced to the right in Fig. 4*and will throw tongue 28 against contact 37 causing a marking impulse to be transmitted. \Vhile pin'117 is gaged'in a perforation, will be shifted about its pivot against the tension of spring 153 until the end of its slot 146 is approached. At the end of the impulse and before the end of slot 146 is reached, cam 134 will force finger 141 and the member 130 individual thereto downward against the tension of the spring 133, causing withdrawal of finger '141 from the tape before the tape can be torn. Spring 153 will then force finger 141 into engagement with the left end of its slot 146. As soon as the first impulse is transmitted, pin 118 will rotate past cam 123 and will transmit the second impulse in accordance with the position of the cam. While pin 118 is transmitting its impulse, finger 143 is permitted to move upward by cam 136 to position cam 124 for the third impulse. The

fourth and fifth impulses are likewise deter-.

1 mined and transmitted in succession, and

each impulse is controlledby fork 1 through the actuation of magnet 21. Because the tape is advanced continuously the fingers 141 to 145 are arranged at a relative angle with respect to the perforations, and thisunay ob- Viously be accomplished by arranging either the tape fingers atan angle as shown, or by arranging the perforations at an angle. As

the timing of the impulses is effected by the rotation of the pin barrel, more than one of the cams 122 to 126 may be selectively positioned at the same time. By positioning and restoring the cams successively an advantage of uniform distribution of power is attained which will permit the use of less power and lighterparts.

Transmission of successive signals at a uniform rate will proceed until the tape is tensioned sufliciently to raise link 180 and through trip arm 174 into the path of rotation of projecting trip extension 173. Rotation of member 116 will continue untilextension 173 engages the end of arm 174. Member 160 will then move about its pivot 159 against the tension of spring 163 until pin 177 is engaged and until projection 175 engages 176 when the pin barrel will come to may be eliminated, and the pin barrel may be directly driven by gear 170. It will also shown.

Receiving apparatus The mechanisms of the selector and printer are for the most part the same as those disclosed in copending applications, Serial Number 649,562, filed July 5, 1923, and Serial Number 656,857, filed August 11, 1923. Accordingly, only so much of these mechanisms as will disclose -their relation to novel parts herein. disclosed will be shown and described.

Incoming impulses are distributed by th'e receiving fork 81, and magnet 54 is actuated in properly timed relation therewith to withdraw armature from engagement with projection 184 and to permit one rotation of pinion 183 for each received impulse. The control drive arrangements and operation of magnet 54 and the parts numbered 183 to 194 are the same as above set forth in connection with Figures 1 to 7, and need not be here repeated. Pinion 183 during each revolution, drives gear 200 secured to shaft 201 an angular distance allotted to the reception of oneshaft 73 is provided with an extension 211 slidably journalled in a bearing 212, and forced into engagement with armature 71 by a spiral spring 213 interposed between memher 204 and cam 206 which normally forces the pin barrel to the right in Fig. 8. It will be noted that the start-stop pin and mechanismof the copending application are eliminated. Otherwise the structure and opera -'tion of these cams is substantially the same as in application, Serial Number 649,562. Thec'ams 206 to 210 selectively set selector bar control fingers 213 to 217 which correspond in structure and operation to selector fingers 37 to 41 of the copending case and are controlled by latches (not shown) of the same structure and in the same manner as the fingers 37 to 41 of the copending case are controlled. Selectorfingers 213-to 217 control the position of notched selector bars 218- to 222 corresponding to bars 59 to 63, of the copen'ding case, bars 218 to 222 being normally urged to the left'in Fig. 8 by springs 223 corresponding to springs 65 of the copending case. The position of bars 218 to selectively controls actuating bars 224 corresponding to actuating bars 108 of the copending case, and bars 224 are actuated by .129 of the copending case.

- controlled by the selector bars 218 to 222, and

this reason.

of the selector finger control, operation and functions will be had by reference to the copending application, Serial Number 649,562, and further detail will not be given here for Themethod of shifting, locking aiid re- ,storing the selectorbars 218 to 222, and of operating bail shaft 225, and the apparatus therefor, is considerably simplified over the methods and apparatus shown in the copending case. The trip clutch controlled by the selector mechanism for controlling the operation of the selector bar, locking and restoring mechanisms and the printer bail opera tion is eliminated. Mounted upon and rigidly securedto shaft 201 is a selector bar restoring and locking cam 226 provided with a restoring surface 227 and a lock actuating surface 228. A selector bar restoring and v control arm 229, corresponding to arm 77 of thecop'ending case, is pivotally mounted on spindle 230 and is provided with an actuating roller 231 which is held against surface 227 of ca-m 226 by'the o'peration of spring 232 secured to'extension 233 of arm 229. Each of. the selector bars 218 to 222 is provided with a set of locking notches 234 and 235 into which a locking bar 236 is ada )ted to fit. Bar 236' is carried on an arm 23 pivotally mounted at 238. An extension 239: of arm 237 has mounted on the end thereof ,a roller 240 which is held againstthe surface 228 of cam 226 by weight of arm 237 and bar 236. If desired, a spring may obviously be used to hold roller.

'240 against surface 228. Secured to shaft 201 is a printer bail operat ng cam241 against which an actuating roller 242 is normally held by operation of the bail spring (not shown). Roller 242 is mounted on an operatingjarm 243,. vhich...is secured to and actuates bail shaft 225. e

The shape of the cam surfaces 227, 228, and of cam 241 are highly important in the proper timing of the various operations. As set'forth in the copending case, an overlap occurs in the setting and restoration of the selector fingers. While cam 206 is setting finger 213 during the reception-of the first impulse of a signal, c'am 208 is restoring finger 215 from the preceding setting. While cam 207 is setting finger 214 during the reception of the secondimpulse, cam 219 is restoring finger 216, and while cam 208 is setting finger 215 during the'reception of the third impulse, cam 210 is restoring finger 217. Fingers 213 and 214 remain set while cams 209 and 210 set fingers 216 and 217 dur-' ing the fourth and fifth impulses. Immediately after the finger 217 has been set, and

the bars 218 to'222 have assumed the selected position, and before the first impulse of the succeeding signal has been received, pin 206 simultaneously restores fingers 213 and 214 in a-manne1-that w1ll be ObVlOUS to those skilled in the art from the description of the selector finger restoration in the copending case. a Y

The shape of cam surface227 is such that bars 218 to 222 are shifted to the right immediately after the previously selected actuat ing bar 224 is moved out of the aligned selector bar slot as set forth in the copending. case, and which may occur shortly after the selected operation has beenefiected, and is also such that roller 231 drops off the cam shoulder as-soon as the fifth pulse finger 217 hasbeen set, permitting the selected ones of bars 218 to 222to shift to the left in Fig. 8. The shape of surface 228 is such that as soon as the. selected ones of bars 218 to 222 have shifted to actuated position, locking bar 236 is forcedinto the aligned notches 234 and 235 and will lock the bars 218 to 222 in selected position. As soon as the selected actuating bar 224 drops into the selectively aligned se lector bar slots, surface 228 may be such as to raise bar 236 out-of notches 234 and 235.

Cam 241 is so shaped that bail shaft 225 is actuated to operate the bail in such a-manner that actuating bars 224 will drop intoengagement with selector bars 218 to 222 just after the selector bars assume actuated position, and so that the printing and restoring movement of the selected actuating bar is. completed sufliciently to lift the selected actuating bar from the aligned slot and permit proper restoration and resetting of the selectorbars for the next selective setting.

' Operation of receiver inbefore set forth. As the impulses are received cam shaft 73 will be positioned endwise in accordance therewith by the operation of magnet 67,.and the selector fingers 213 to 217 will be set by cams 206 to 210m accordance with the received combination, as above set forth. As soon as the last impulse of the code combination has effected the setting of finger 217, bars 218 to 222 will be permitted to assume the positions determined by the setting of the fingers through operation of member 229 and springs 223; and bar 236 will lock the selector'b'ars in selected position; The setting of'the succeeding selection on fingers 213 to 217 may then immedi- 125.

ately proceed. At the same time cam 241 permits the movement of the bail. structure forward under influence of the bail spring to selector bars. At any time after the selected actuating bar has dropped into the slots and before member 229 restores the selector bars, locking bar 236 is removed from the locking slots. As soon as the selected actuating bar is removed from the aligned selector bar slots by the restoring movement of the bail structure, and in time to catch the succeedin selection on fingers 213 to 217, the selector ars are restored by member 229, and the cycle of operation is repeated so long as signals are received.

Having shown and described preferred embodiments of the invention of which many modifications and applications, will suggest themselves to those skilled in the art, what .is desired to be secured by L'etters Patent and for varying the periodof vibration of said receiving reed in a manner to establish concordance of action of said receiver and transmitter.

3. A telegraph system comprising a transmitting fork vibrating at a predetermined rate and a transmitter controlled thereby; a receiving fork vibrating naturally at a slightly slower rate than said transmitting fork and a receiver controlled thereby; and

. means controlled by transmitted current impulses for spee'ding the rate of vibration of said receiving fork above the rate of vibration of said transmitting fork in a manner to maintain substantially concordance of action between said transmitter and said receiver. J

4. A tape; a transmitter controlled by said tape comprising means for imparting -succeeding code-combinations comprised of se lecting impulses only to a line in rapid succession, and ,means controlled by the tension of the tape for arresting said transmitter only between completed code combinations and in a-position to impart aspacingcondition to the line.

5. In a telegraph system, a tape transmitter; a friction clutch for said tape transmitter comprising a driving and a driven-amemher; a fixed stop; a movable stop carried by the driven 'member of said clutch and normally prevented from engaging said fixed stop; and means controlled by the tension of said tape for causing said movable stop to engage said fixed stop to arrest the rotation of said driven member.

6. A printing telegraph receivercomprising a selector mechanism advanced step by step under influence of a line controlled reed; a printing mechanism controlled by said selector mechanism; operating means for receiver in 'definitely'timed relationwith respect to the received impulses; and means whereby said vibrating reed is controlled by said received code combinations of impulse conditions. i

8. In a telegraph system; a receiver selectively responsive to incoming code combinations of ignalling conditions, a vibrating means controlled solely by' said vibrating reeds for supplying the driving power forrotating said receiver intimed relation with the incoming signalling conditions; and

means controlled by "said received impulses and said reed for controlling the rate of.

vibrating of said reed to operate in timed rel tion with said received impulses.

9. In a multiplex system for signalling, comprising a plurality of transmitters; a vibrating fork; means whereby said fork is alternately and successively associated with each "of said transmitters 'for'transmitting code combinations of signalling conditions therefrom over said line; means whereby said fork alternately and successively conditions said transmitters for the transmission of said impulse conditions; said first and second mentioned means operating in such manner that one of said transmitters is conditioned by said fork for the transmission of signalling conditions while said fork is associated with the other of said transmitters for the transmission of signalling conditions therefrom.

10. In a multiplex systemcomprisingaplu-' rality of transmitters; a signalling line; a vibrating reed and circuit connections including said reed for alternately and successively connecting said transmitters to said line for transmitting code combinations of signalling conditions thereover;

vwhereby said fork alternately and successively conditions said transmitters for the transmeans a mission of said impulse conditions; said first v and second mentioned means operating in such manner that one of said transmitters is conditioned by said fork for the transmission in timed relation with the connection of the transmitters individual to the line, whereby each of said receivers is operatedin accordance with the code combinations of signalling conditions transmitted by the transmitter individual thereto.

11. In a telegraph system 'in which the transmitter and receiver are manually orientated to operate in proper phase and synchronous speed relations with each other during initial operation, a transmitter for transmitting code combinations of signalling conditions having a rotatable element; a receiver responsive to said code combinations of signalling conditions having a rotatable element having no normal position; means operative after said orientation has been eifected for starting and stopping said transmitter but not said receiver; and means whereby said transmitter can be thereafter started into operation only when the rotatable element thereof is in predetermined phase relation with said rotatable receiver element.

12. In a telegraph system in which the transmitter and receiver are manually orientated to operate in proper phase and synchronous speed relations with each other during initial operation, a transmitter, driving means therefor; a continuously operating re ceiver; means for malntamlng sa1d transmitter driving means and said receiver inv synchronism; means operative after said orientation has been effected for startmg and ing initial operation; a receiver, a rotatable shaft; driving means therefor; means controlled by said rotatable shaft for transmitting code combinations of signalling conditions; means operative after said orientation has been effected for starting and stopping said transmitter but not said receiver; means for releasing said shaft for rotation under the influence of said driving means; and means .for preventing rotation of said shaft until said driving means has reached a predetermined position. 1

- In testimony whereof, I aflix my signature.

EDWARD E. KLEINSCI-IMIDT.

stopping said transmitter but not said receiver; and means whereby said transmitter is associated with its driving means to be driven thereby only when said receiver is in proper phase relation therewith.

13. In a telegraph system in which the transmitter and receiver are 'manually orientated to operate in proper phase and synchronous speed relations with each other during initial operation, a rotating transmitter, for transmitting code combinations of sig nalling conditions; a receiver operable in synchronism therewith and responsive to said received code combinations of signalling conditions; means operative after said orientation has been effected for starting and stopping said transmitter but not said receiver; and means controlling said last mentioned means in such manner that said transmitter is automatically started into operation in I proper phase relation with said receiver.

14. In a telegraph transmitter in which the transmitter and receiver are manually orientated to operate in proper phase and syn chronous speedrelations with each other dur-

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