US2083160A - Telegraph printer system - Google Patents

Description

June 8, 1937. H, FINCH 2,083,160

TELEGRAPH PRINTER SYSTEM Filed April 10, 1936 4 Sheets-Sheet 1' ERYYULOPI ASDFGHJKL ZXCVBN SPA BAR' INVENTOR WILLIAM 6-H. FIMCH gig I BY ATTORNEY June 8, 1937. w. a. H. FINCH TELEGRAPH PRINTER SYSTEM 4 Sheets-Sheet 2 Filed April 10, 1936 INAVEINTOR J1me 1 -w. a. H. FINCH TELEGRAPH PRINTER SYSTEM Filed April l0, 1936 4 Sheets-Shqet 3 I IIIII I IIIII Q l lllll .m l l l l l I I ll IIII IIIIm IIII m IIII N I III IIII I III .ll l .IIIF I III n II...||.I m I IIIIIIIa I II.IIII I II o I II z I II I II .I I IIIIIIx I I III 1 I I III I. .ll I I o I INYENTOR Wu. LIAM 6H.

FINCH ATTORNEY June 8,1937. w. G. H. FINCH r 2,083,160

TELEGRAPH PRINTER SYSTEM I Filed April 1d, 1936 4 Sheets-Sheet 4 I 101 i A 102 2 is a 257 /Mi 106' .l WW 107 RAD/0 167 TRANSMITTER 3 l 0 I 165 154 v IN VENTOR.

ATTORNEY.

' Patented June 8, 1937 UNITED STATES PATENT OFFICE TELEGRAPH PRINTER SYSTEM William G. H. Finch, New York, N. Y.

Application April 10, 1936, Serial Nil/73,783 18 Claims. (01.178-79) My invention relates to novel apparatus for and methods of generating 'codecombinations of signals and more particularly relates to a novel portable telegraph code transmitter.

In my Patent No. 2,008,389, issued July 16,

1935, I disclose a portable telegraph receiver operating on along and short. or dot-dash code as distinguished from the uniform Baudot code.

. Although practical transmitters have been delO veloped for generating Baudot code signals, this being a relatively simple problem because of the uniform character of the impulses or signal conditions, the transmitters heretofore developed for transmitting long and short impulse codes have involved complicated, heavy and costly mechanisms.

The transmitter required to operate the printer described in my patent above to be useful as a portable unit has to be light, inexpensive and relatively simple to operate.

The inventive concept of my transmitter, accordingly, embodies a novel single-contact all- .mechanical transmitter for generating code combinations of long and short impulse conditions.

Accordingly, an object of my invention is to provide a novel inexpensive transmitter for generating long and short impulse signal conditions.

A further object of my invention is to provide a novel single-contact long and short impulse code transmitter.

Still another object of my invention'is to pro vide a novel portable transmitter.

A further object of my invention is to provide a novel all-mechanical transmitter. There are other objects of my invention which, together with the foregoing, will appear in the detailed description which is to follow in connection with the drawings, in which:

Figure 1 is a plan view of an apparatus for mechanically converting a code system into corresponding electrical impulses. 9-

Figure 2 is a section taken on the-line 2-2 of Figure 1.

Figure 3 is a section taken on the line 3-3 of Figure 2 but with certain parts left oif .for the sake of clearn'ess.

Figure 4- is a fragmentary'section taken on the line 4-4 of Figure 2 and showing the cam shaft stop mechanism.

Figure 5 is a fragmentary side view of the key locking cam and cam finger.

Figure 6 is a diagram of the dot and dash code system which the illustrated apparatus is adapted to transmit. v

Figure 7 is a diagram of the group of code bars writer.

arranged in the order in which they are placed in the machine.

Figure 8 is a diagram of the various code bar operating cams in their relative positions as placed in the machine.

Figure 9 is a diagram of one set of elements which cooperate to produce one impulse in a plurality of impulses comprising a specific signal. Y

Figure 10 is a diagrammatic view of the circuits and printer which operate in response to 10 the codes generated by my novel transmitter.

Referring to the-drawings, the apparatus consists broadly of a bank of selector key bars I (Figures 1 and 2) mounted upon a base plate ll and arranged to be operated manually similarly 15 to a typewriter; a group of code or permutation bars l2 mounted in operative relation beneath the key levers and at right angles thereto; a series of code bar cams l4 (Figures 3, 8 and 9) placed at one end-of the code bars and adapted to actuate 20 certain bars as determined by a depressed key bar so as to make and break an electrical circuit through contacts l6 and I! placed 'at the opposite end of the code bars.

Each of the selector key bars I 0 is equipped with 25 a button 20 which is marked with a letter, number or other character and so arranged as to form a keyboard similar to that of a standard type- The key bars III ,are mounted within suitable guide members so as to have a short vertical movement about a pivot and as embodied this comprises a knife-edge fulcrum bar 2| supported at each end on posts 22 and placed at right angles to and near the rear end of the key bars. all of which are pivoted thereon by means of a 35 V-shaped notch on their lower edges.

The central and forward ends of the key bars are slidably supported in spaced relation by comb- plates 23 and 24, the spaces of which are sufficiently deep to allow the desired vertical,

movement of the key bars about their fulcrum. The comb- plates 23, 24 are supported upon the base II by four corner posts 25.-

Secured on the upper edge of the comb-plate 23 and extending between the two front corner posts is an angle strip 26 carrying a strip of felt or other shock absorbing material 2'| on its underside and so'positioned as to limit the upward movement of all the key bars. The front ends of the key bars are resilientlyheld in their upper 50 bank, are connected together by a finger bar 30 so as to act as a unit or single bar and do not differ from the other bars, being similarly adapted to select and transmit their own code signal representing a space just as each of the other -chine is related to the type of code used. In the illustrated form, eleven code bars are provided as being the proper number to transmit a code system wherein each signal comprises twelve impulses of both long and short duration (the socalled dot and dash type) grouped in different orders individual to each of thirty-six characters. The first ten impulses of the signal may .be employed to select the different characters while the last two may perform .functions in the mechanism common to all the characters suchas resetting the receiving mechanism after each character signal has been received and recorded. These last two impulses, a short and a long one, are produced by the code bar F (see Figure 7.).

The other code bars are restricted to character.

representation impulses only.

As shownin Figure 1, the middle code bar I2 is the space signal and non-character signal bar F but its central position in the group of bars is arbitrary and immaterial to its operation. Referring now to Figures 1 and 3, the means for reciprocating the code bars, at their left end, Figure l, is a-series of U-shaped spring levers 34 pivoted on a common pivot pin 35 carried in brackets 36, 31 on the left corner posts 25. One leg of each lever 34 bears against the left end of each code bar I! while the other leg of the U rides on the periphery of one of the eleven cam disks l4. At the right end of the code bars and in contact therewith is a bridge plate 4|, pivoted on pin 42 which is carried in brackets 43, 44 fastened on right corner posts 25.

The bridge plate 4| is the base member-upon which is mounted the contact I6 which, with contact N, forms the circuit maker in the signal impulse circuit. Contact I3 isformedon the upper end of a spring conductor strip 45 which is secured to and insulated from 'the bridge plate 4| by a block of fiber orsimllar material 46.

The conductor 41 is attached to thelower end code bar guide member 33, serves to move all the code bars to the left, Figure 1, against their respective spring levers 34 and the latter, in turn, are held against their respective cams l4.

The manner in which the code bars l2 are constructed so as to cooperate with the key bars III will now be described. Each code bar consists of a plurality of vertical slots 53 so arranged as to allow any key bar to enter when it is de-' pressed. Certain of the slots 53 are of the same 75 width as the thickness of the key bars while bridge plate 4| and the other end anchored to the others are twice as wide in such wise that the additional width is provided on the left side of the slot, see Figure 7. Thus, when a key bar is depressed it will enter one of the slots 53 and if it is a wide slot, the code bar can be moved to the rightunder the action of its cam M to complete a circuit through the contacts l6, I! or to maintain said circuit if the bridge plate 4| had previously been moved to contact making position by other code bars. If the slot 53 entered by the key bar is a narrow one, the code bar is prevented from moving laterally and the motion produced by the high spot on the associated cam is absorbed in the U-shaped spring lever 34. The wide and narrow slots 53 in the code bars A, B, C, D, E, G, H, I, J, K, in their relation to each other and to the position of the key bars l0 serve to determine the proper order and sequence of the dot and dash electrical impulses to transmit a selected code signal.

In Figure 7, the code bars I2, A to K, and their slots 53 are shown diagrammatically. The Space code bar F in the mechanism illustrated has a long cut-out I53 to receive all the key bars but not be held against lateral movement thereby.

Each group of signal impulses which represents a character or space consists of a combination of twelve long and short electrical contacts' in a certain order as, for instance, an A is one long or dash and ten short or dots and another long or dash series of impulses; and an H consists of two dashes, three dots, one dash, five dots and one dash. The space signal is eleven dots and one dash. In each case there are twelve impulses. Figure 6 is an illustration of the code which may be employed.

The cam disks are all keyed to a common shaft 60, act as a unit.and are provided with cams equally angularly spaced throughout 360 so that in one revolution they cause twelve electrical contacts to be made. The order and time duration of each contact is controlled by a depressed key bar and its relation to a wide or narrow slot in each of the eleven code bars.

In Figure 8, the cams M, A to K are shown in their relation to each other in the machine in their position of rest. Cam F acts as the primary cam and actuates code bar F, which is always free to move, to produce eleven short impulses and one long one. If the space bar 30 is depressed all of the code bars except F are locked against movement and a space signal is produced, but if any other key bar, say R, is depressed, the eleven dots 'and one dash signal is modified by certain code bars which are free to move. Code bars G, H and I are free to move in the selected example, R, and cams G, H and I, which actuate these bars are provided with a long" high spot in such relative position as to convert the sixth, seventh and eighth dots produced by cam F to dashes, this modified signal then consisting of five dots, three dashes;three dots and one dash which represents the letter R in the code. Each key bar when depressed thus locks its own characteristic combination of code bars, the remaining free ones then modifying the primary or basic signal of eleven dots and one dash to a signal representing the letter of that key bar.

Referring now to the operation of the cam shaft 63, a journal bracket 6| (Figure 1) is provided tosupport the shaft and its cams l4. On the rearwardly projecting cam shaft 60 is pinned a key bar locking cam 52 and a one-revolution clutch member 33. Cooperating with clutch member 63 is a similar clutch disk slidably keyed on the end of motor driven shaft 65 and held in continuous frictional engagement with member 63 by a spring 56 which encircles shaft 65 and abuts on'a collar 6! secured-thereon.

, Shaft 65 is journaled in a bearing clock 63 and is driven by a motor 69 mounted on-the base plate II. The motor 39 runs continuously during the operationofz the machine. g

Since the transmission of a signal is instituted by depressing a key bar, the latter is utilized to control the operation of the one revolution clutch. member 63. As constructed-member, i3

has rotatablv mounted on its hub a stop arm blocks I6. The rod 15, which extends theentire width of the machine, has mounted thereon an actuating bail comprising a pair of arms I1 and a cross bar 18 which normally rests against the front of comb-plate 24 and beneath all the key bars I0. It is spring held in that position by a torsion spring I9 coiled about rod I5 adjacent one of the arms TI and bearing block 16.

Thus it wlll be' seen that when any one of the key bars I0 is depressed, the stop finger I4 will move out of the path of stop arm 10 and the clutch member 63 will then rotate with its mate 34, causing cams I4 to start their cycle of signal contacts as determined by the depressed key bar. When the key bar is released finger I4 again enters the path of stop arm I0 and stops clutch member .63 from further rotation;

The tensionspring 13 on stop arm 10 serves merely to eliminate the shock of a sudden stop of clutch 63. -A pawl 30 cooperating with a tooth on the periphery of clutch member 63 inthat a complete revolution of the cam shaft 30 take place before a second key-'baris operated and further that any other key bar cannot be depressed until the signal cycle of the cams I4 has been substantially completed. To this end, there is provided a lock bar 85 rotatably mount;- ed on the back of combplate 24 by means of rocker rod 86 and bearing blocks 81. The left end, Figure 1, of therod 86 is extended and carries a cam finger 38 which bears against the face of key bar locking cam 62 due to a spring 39 coiled about the rod adjacent to finger. The hooked end of lock bar is adapted to enter a notch 90 in a depending lug 9| on each key bar when it is depressed, or, if not depressed, to pass directly beneath lug SI and prevent the bar from being depressed. Thus, the first movement of cam shaft 60, which was started by the depression of a certain key bar, serves to lock that particular bar in the .down position and all the other bars in the up position until the locking cam 62 make almost a complete revolution when the depressed bar is released in time to allow finger I4 to stop the clutch 63 but after the last signal contacts have been made. Due to this construction, it is obvious that the operator of the keyboard cannot depress the various keys at a speed faster than the machine can transmit each 7 Although my novel transmitter may be emand restoration of the printer.

ployed for generating long and short impulses of any code type such, for example, as the Morse code or others, I have here illustrated it for producing long and short impulses comprising signals to operate a printer such as disclosed in my Patent No. 2,008,389 and as illustrated by the circuit and apparatus shown in Figure '10. This mechanism comprises a receiving device I, a

receiver controlled relay II2 for repeating the received code, combinations of impulses to the selecting and recording system, a controlling device II3 responsive to the short and long impulses of the receivedcode and a printing mech- I anism which is selectively actuated to progressively print upon a movable-tape II4 a letter orcharacter corresponding to the transmitted code combination of short and long electrical impulses assigned to represent that character.

In response to the starting impulse, relay II2 which is a slow acting relay. is energized.

Normally relay II2 whose winding is of a lowerresistance than the series windings of magnet I43 and relay 200, provides a by-pass circuit forthe current from battery 2. over contact I23 and brush I20 to ground at 22I. however, upon being energized over this circuit,

opens the circuit at its armature 2I3' which disengages its back contact.

Thereafter upon receipt of the first signal impulse, the circuit completed extends over conductor 2I3 as will be explained hereinafter, since relay II2 being slow to release is not deenergized during the no-impulse period.

If, therefore, the synchronizing impulse is received while brush I20 is on contact I23, normal operations proceed as will be described.

If, on the other hand, no impulse is received when brush I2Ilis on contact I23, no operation can occur. For reasons that will appear hereinafter, brush I20 will remain on contact I23 until the synchronizing impulse showing that the transmitter and receiver are in synchronism is received.

Relay I I2,

The resetting is much longer ,than

even the long impulse of the code to be described in order to energize extra slow relay II2. As soon as relay I I 2 is energized, stepping magnet I48= is energized over a circuit to be described in connection with the code signals. Brush I20 is moved from contact I23. At the end of the synchronizing impulse, magnet I48 is deenergized, stepping the brush a further distance and the apparatus is ready for the first signalling impulse. y

In response to the firstsignal impulse energizing relay 2, an energization circuit is completed from the battery 2 front contact and armature 2I0 and conductor 2I3 through the "magnet I48, conductor 2I4 and relay 200 to ground at 2I5.

Magnet I48 is a stepping magnet controlling the operation of the distributor device II3 which rotation with shaft I43 is the friction disc I44 including plates I22 and I45.

As motor I40 rotates, shaft I2I carrying distributor arm I20, tends to rotate with it, but is normally prevented from rotating by the pawl I41 'in engagement with one tooth of the ratchet I46,

secured to the shaft I2I. One end of the pawl I41 consists of an armature controlled by a magnet I48 to which the armature is attracted when that magnet is energized. Normally, how- 'ever, the pawl I41 is held against its backstop about its pivot withdrawing the lower tooth of an insulating ring H3.

pawl I41 from the ratchet wheel I46 and moving its upper tooth in the path of the ratchet wheel permitting a rotation of the shaft I2I with arm I20 through an angle equal to one-half the pitch of the teeth of ratchet wheel I46.

The distributor arm I20 is moved successively into engagement with a series of contacts I24 to I36 consisting of contacting points mounted on Each of the contacts I24 to I28 is common to a character on each disk wheel, five contacts being shown here for. purposes. of illustration of a printer in which there are five characters on each disk wheel to be described. Each of the contacts I29 to I34 is individual to a type wheel disk of a printer consisting of a plurality of such disks. Contact I35 controls a printing operation and contact I36 a restoring operation all of which will be described in more detail hereinafter. The pitch of the teeth of ratchet I46 is equal to the angular displacement'between successive contacts, so that when magnet I48 is energized to permit the escapement mechanism I46 and I41 to operate, the distributor arm I20 is-rotated either from a contact to a point intermediate the contact and a successive contact or from an intermediate point to asucceeding contact. With brush I20 therefore inthe normal position shown, the receipt of the first code impulse energizing relay I I2 which in turn energizes the escapement magnet I48 will permit rotationof brush I20 in the direction of the arrow shown to the first contact I24. It will be recalled that the escapement magnet I48 was energized in a series circuit with relay 200.

Relay 200 is a' slow-to-energize relay constructed so that it will not respond to the short impulse of the code but is only responsive to the long impulse. If, however, the first impulse received is a long impulse, relay- 200 will energize after an interval of time and an energizing circuit will thereupon becompleted from ground at 22I over distributor brush I20, contact I24,

conductors 220 and 2I9, through the selector relay I19, conductors 2I8 and 2I1', front contact 20I and armature 202, conductors 2I6 and 2I2 and through battery2II to ground. The effect of the energization of relay I19 will be described hereinafter.

Upon the completion of the firstcode impulse, relay H2 is deenergized, opening theenergizing series circuit for the magnet I48 and relay 200. Upon the deenergization of relay I48, pawl I41 is restored to the position shown permitting rotation of shaft I2l for a distance equal to half the pitch oi. the ratchet I46. Brush I20 rotates from contact I24 to a point intermediate contacts I24 and I26. Selecting'relay I19 is deenergized and one-half a tooth pitch from contact I24.

the apparatus is back in normal condition in preparation for the next impulse.

The same cycle of operations'is now repeated, brush I20 moving into engagement with contacts I25 and I28 successively in response to each impulse received and in turn controlling the selective energization of relay I19 in accordance with whether the received impulse is long or short.

The first unit selection is completed when the brush I20 leaves contact I28 and the second unit selection begins when the brush engages contact I29. If a long impulse is received at this time, relay 200 is energized, and a circuit is completed from ground at 22I, brush I 20, contact I29, conductor 232 and 23I, through the magnet I10, conductor 230 and thereafter over conductor 2I1 to battery 2 and ground as described hereinbefore.

Relay I10 is a second selection relay which is energized in response to long impulses in the second unit of the code for selecting the particular type wheel disk. Relay I19 having previously selected a particular column of characters, a final selection is thus completed as will be described in more detail hereinafter. The selection having been completed, the printer is now in position for operation and on receipt of the next impulse which is the printing impulse, brush I20 engages contact I35 to extend the energizing circuit from ground at 22I over conductor 234 to the printing magnet I90 and conductor 233 to battery 2 and ground. Upon the energization of the printing magnet, the printing operation of the selected characteriscompleted. Brush I20 is now moved to contact I36 to complete an energizing circuit over conductor 231 for the restoringv magnets I86 and I12 in series over conductors 235 and 231. Magnets I86 and I12 upon energization restore the apparatus to normal. Following the restoration of the apparatus brush I20 moves to its normal position shown in synchronizing contact I23.

It will be noted that contact I23 is spaced onehalf a tooth pitch from contact I36 and one and At'the end of the last signal, relay H2 is deenergized to move brush I20 to contact I23.

Upon receipt of the synchronizing impulse, relay II2is energized to energize relay 2' if the impulse is long enough. Magnet I48 is energized as soon as relay H2 is energized to move brush I20 ofi of contact I23. Thereupon magnet I48 is deenergized at the endof the synchronizing impulse and brush I20 moves to one-half a pitch distance from contact I24 in preparation for the first signaling impulse.

If during the signaling period an impulse, is lost and distributor brush I20 so falls out of synchronism with the transmitter, brush I20 will continue to be stepped until it'reaches synchronizing contact I23, It will then be held at this position because of the deenergized condition of relay 2' providing a bypass around magnet I 48 lector bars; a contactor; means, controlled by said selector bars, operating on said contactor for generating a predetermined number of like sig; nals; and further means, controlled by said selector bars, operating on said contactor for moditying the generated signals of said first means into the generation of code combinations of variable signals.

2. In a telegraph transmitter; a plurality of selector bars; a contactor; means, controlled by said selector bars, operating on said contactor for generating a predetermined number of dot 5 signals; and further means, controlled by said selector bars, operating on said contactor for modifying the generated signals of said first means into the generation of code combinations of marking and spacing signals.

3. In a telegraph transmitter, a plurality of selector bars; a contactor comprising a bar; means, controlled by said selector, bars, operating on said contactor for generating a predetermined number of like signals; and further means, conl5 trolled by said selector bars; operating on said contactor for modifying the generated signals of said first means into the generationof code combinations of variable signals.

4. In a telegraph transmitter, a plurality of se- 20 lector bars; a contactor comprising a bar having a single elongated slot and having a normal and a longitudinally spaced operated position in which itoperates said contactor; means, controlled by said selector bars, operating on said contactor 25 for generating a predetermined number of like signals; and further means, controlled by said selector bars, operating on saidcontactor for modifying the generated signals of said first means into the generation of code combinations 30 of variable signals. Y 5. In a telegraph transmitter, a plurality of selector bars; a contactor; means, controlled by said selector bars, operating on said contactor for generating a predetermined number of like 35 signals; and further 'means comprising a plurality of permutation bars, controlled by saidselector bars, operating on said contactor for modifying the generated-signals of said first means into'the, generation 01" code combinations of variable 40 signals.

6. In a telegraph transmitter, a plurality of selector bars; a contactor; means, controlled by said selector bars, operatingon said contactor for generating a predetermined number of like 45 signals; and further means comprising a plurality of permutation bars having notches, con- 'trolled by said selector bars, operating on said contactor for modifying the generated signals of said first means into the generation of code 50 combinations of variable signals. 7. In a telegraph transmitter, a plurality of selector bars; a contactor; means, controlled by said selector bars, operating on said contactor for generating a predetermined number of like 55 signals; and further means comprising a plurality of permutation bars having notches mounted in operative relation beneath said selector bars and at right angles thereto, controlled by said selector bars, operating on said contactor oo i'or modifying the generated signals of said first means into the generation of code combinatiens of variable signals.

8. In a telegraph transmitter,- a plurality of selector bars; acontactor; means, controlled by 65 said selector bars, operating on said contactor for generating a predetermined number of like I signals; and further means comprising a plurality of permutation bars having notches mounted in operative relation beneath said se- 70 lector bars and at right angles thereto, controlled by said selector bars; means for selectively operating said selector bars into predetermined notches of said permutation bars for limiting an endwise movement of predetermined permuta- 7 tion bars; and means including circuit connections for operating on said contactor in response to variable arrangements of 'said permutation bars for modifying the generated signals of said first means into the generation of code combinations or correspondingly variable signals.

9. In a telegraph transmitter, a plurality of selector bars; a contactor; means, controlled by said selector bars, operating on said contactor for generating a predetermined number of like signals; and means comprising a plurality of 10 permutation bars, said permutation bars having a normal position and a longitudinally spaced operated position, controlled by said selector bars, for operating on said contactor for modifying the generated signals of said first means into the generation of code combinations of variable I signals.

10. In a telegraph transmitter, a plurality of selector bars; a contactor; means, controlled by said selector bars, operatingon said contactor for generating a predetermined number of like signals; means comprising a plurality of permutation bars, said permutation bars having a normal position and a longitudinally spaced operated position, controlled by said selector bars,

' for operating on said contactor for modifying v the generated signals of said firstrmeans into the generation of code combinations of variable signals;-and a plurality of code bar cams, one

for each of 7 said permutation bars, each cam being located at one end or its associated permutation bar and arranged to move its associated permutation barrendwise. Y

11. In a telegraph transmitter, a plurality of selector bars; a contactor; means, controlled by 'said selector bars, operating on said contactor for generating a predetermined number of like signals comprising a bar having a single elongated slot and having a normal and a longitudinally spaced operated position in which it operates 40 said contactor; a cam adjacent one end of, said last bar for moving said last bar longitudinally periodically during each complete revolution thereof; means comprising a plurality of'permutation bars, controlled by said selector bars, for r operating on said contactor for modifying the generated signals of said first means into the generation of code combinations of variable si nals; a plurality of code bar cams, one for each of said permutation bars, each cam being located g at one end of its associated permutation bar and arranged to move its associated permutation bar endwise; and a shaftcarrying all of said cams.

12. In atelegraph transmitter, a plurality of selector bars; a contactor; means, controlled by said selector bars, operating on said contactor for generating a predetermined number or like signals; means comprising a plurality of permutation bars, said permutation bars having a normal position and a longitudinally spaced operated position, controlled by said selector bars, for

' operating on said contactor for modifying the generated signals of said firstmeans into the generation of code combinations of variable s18- nals; a plurality of code bar cams, one for each of said permutation bars, each cam being located at one end of its associated permutation bar and arranged to move its associated permutation bar endwise; and a shaft carrying all of said'cams.

13. In a telegraph transmitter, a plurality of selector bars; a contactor; means, controlled by said selector bars, operating on said contactor for generating a predetermined number of like signals; means comprisinga'p urality 0f P tation bars, said permutation bars having a normal position and a longitudinally spaced operated position, controlled by said selector bars, for operating on said contactor for modifying the generated signals of said first means into the generation of code combinations of variable signals; a plurality of code bar cams, one for each of said permutation bars, each cam being located at one end of its associated permutation bars and arranged to move its associated permutation bar endwise; a shaft carrying all of said cams;and a power drive for said shaft including a clutch.

14. In a telegraph transmitter, a plurality of selector bars; a contactor; means, controlled by said selector bars, operating on said contactor for generating a predetermined number of like signals; means comprising a plurality of permutation bars, said permutation bars having a normal position and a longitudinally spaced operated position, controlled by said selector bars, for operating on said contactor for modifying the generated signals of said first means into the generation of code combinations of variable signals; a plurality of code bar cams, one for each of said permutation bars, each cam being located at one endof its associated permutation bar and ar-.

ranged to move its associated permutation bar endwise; a shaft carrying all of said cams; a power drive for said shaft including a clutch; and

' means operated simultaneously with the depression of a selector bar for operating said clutch to connect the power drive for rotating said cams.

15. In a telegraph transmitter, a plurality of selector bars; a contactor; means, controlled by said selector bars, operating on saidcontactor for generating a predetermined number of like signals; means comprising a plurality of permutation bars, saidpermutation bars having a normal position and a longitudinally spaced operated position, controlled by said selector bars, for operating on said contactor for modifying the generated signals of said first means into the generation of code combinations of variable signals; a pluralityof code bar cams, one for each of said permutation bars, each cam being located at one end of its associated permutation bar and arranged to move its associated permutation bar endwise; a shaft carrying all of said cams; a power drive for said shaft including a clutch; means operated simultaneously with the depression of a selector bar for operating said clutch position, controlled by said selector bars, for

operating on said contactor for modifying the generated signals of said vfirst means into the generation of code combinations of variable signals; a plurality of code b r cams, one for each of said permutation bars, ach cam being located at one end of its associated permutation bar and arranged to move its associated permutation bar endwise; a shaft carrying all of said cams; a power drive for said. shaft including a clutch; means operated simultaneously with the depression of a selector bar for operating said clutch to connect said power drive for rotating said cams; means whereby said clutch disconnects said cams at the end of each revolution; and means operative following the depression of a selector bar for preventing the depression of a second selector bar until the completion of a cycle of operations.

17. In a telegraph transmitter, a plurality of selector bars; a contactor; means, controlled by said selector bars, operating on said contactor for generating a predetermined number of like signals comprising a bar having a single elongated slot and having a normal and a longitudinally spaced operated position in which it operates said contactor; a cam adjacent one end of said last bar for moving said last bar longitudinally periodically during each complete revolution thereof; means comprising a plurality of permutation bars, said permutation bars having a normal position and a longitudinally spaced operated position, controlled by said selector bars, for operating on said contactor for modifying the generated signals of said first means into the generation of code combinations of variable signals; a plurality of code bar cams, one for each of said permutation bars, each cam being located at one end of its associated permutation bar and arranged to move its-associated permutation bar endwise.

18. In a telegraph transmitter, a plurality of selector bars; a contactor; means, controlled by said selector bars, operating on said contactor for generating a predetermined number of like signals comprising a bar having a single elongated slot and having a normal and a longitudinally spaced operated position in which it operates said contactor; a cam adjacent one end of said last bar for moving said last bar longitudinally periodically during each complete revolution thereof; means comprising a plurality of permutation bars, said permutation bars .having a normal position and a longitudinally spaced operated position, controlled by said selector bars, for operating on said contactor for modifying the generated signals of said first means into the generation of code combinations of variable signals; aplurality of code bar cams, one for each of said permutation bars, each cam being located atone end of its associated permutation bar and arranged to move its associated permutation bar,

' endwise; a shaft carrying all of said cams; a

power drive for said shaft including a clutch;

meansoperated simultaneously with the depression of a selector bar for operating said clutch to connect said power drive for rotating said cams; means whereby said clutch disconnects said cams at the end of each revolution; and means operative following the depression 01 a selector bar for preventing the depression of a second selector bar until the completion of a cycle of operations.

'- WILLIAM G. H. FINCH.

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