US2145264A - Facsimile printing telegraph receiver - Google Patents

Description

Jan. 31, 1539. E. F.'KLEINSCHMIDTI 2,145,264

FACSIMILE PRINTING TELEGRAPH RECEIVER Filed Feb. 19, 1934 ummillll 1 An \l'nl INVENTBR ATTO EY EDWARD 5 Mf/NSC'HM/DT Patented Jan. 31 1939 STATES.

amazes msmmmm TELEG i has RECEIVER Edward F. Kleinschinidt, Highland Park ru, as-

signor to Teletype Corporation, Chicago, Iii, a corporation of Delaware Application February 19, 1934, Serial No. 711,862 23 on (or. ire-ii) This invention pertains to printing telegraph machines and more particularly to facsimile telegraph systems and apparatus. 1

The present invention relates more specifically which letters andotherjcharacters are transmitted character by character to formia' directly legibile printed line, and in which successive characters occupy approximately equal lineal units of space in the line. lusuch systems,

start-stop mechanisms may be. employed in which a printing mechanism is started by a signal over the line, is operated to record one char acter, and thenisstopped by meanslocal to the receiver or by means. controlled by a special signal over the line. Such systems necessarily'require all moving parts to be of light construche started quickly and providing a start-stop mechanism for controlling the recording tape of the facsimile receiver and permitting all other locally .driven members to operate continuously.- In such operation by the device shown herein, theqlocation of a printed character may vary in position upon the record tape, being above or below the true middle of the tape, but with the provisionof a double number of printing edges on the printing wheel, the equivalent of two images ofeach character is produced .upon the recording type for every charcter transmitted, and one of these two images always will be integrally located upon the recording tape, the other being either'integral or divided into two parts respectively above and belowthe one integral image.

Spaces between words are provided in one species of apparatus by sending a dash signal for the purpose or starting the tape, while in another species ofeppaartus the recording tape is permitted to run between words for a limited time without control of line signals, thereby,

be had from the followingdescriptiomtaken in "lug printer according to this invention; a to facsimile telegraph systerru-iv and apparatus in conjunction with the accompanying drawing, wherein I v Fig. 1 shows a plan view of a facsimile receiv- Fig. 2 shows a front elevation of the structure it shown in Fig. l; 1

Fig. dshows an alternative method of releasing the tapedriving mechanism and shows also aline circuit and transmitter; Fig. 4 shows in plan; an alternative design for driving theltape; p r j Fig. 5 shows a front elevation of those essen- Y tial elements of Fig. i which are diflerent from. the structure of Fig. 1, and I Fig. '6 shows a sample of a record produced by the species of Fig. l. y i

: In Figs. 1 and 2, a motor Ldrives a printing shaft 2, and through reducing gears 3, with a ratio oilabout t-to-l, and through friction clutch ,tl drives-also the start-stop tape shaft 5, shown also in, Fig. 3. Shaft t carries driving roller t whichv cooperates with presser roller mechanism ,7! and carries also stop cam t'having four stop notches ii, any one of which may be engaged by stop pawl it on rock shaft it which is rocked by ,iinger it under control ofarmature it.

The magnetic system of the receiver comprises a core it with return pole pieces 2i and polarizing winding it energized by battery it in circuit it, cooperating with armature it, which comprises-a member of insulating material having an annular groove which contains a winding connected by flexible wires to terminals 25 and 2t. the armature it being mountedupon a fiat spring 2% which has a normal tendency to lift the armature, it away from the core it. The armature it carries a knife edge 3t which, when the armature retires from core it, engages the recordlug tape 3i to press it and ink ribbon 32 against the fluted printing wheel 33 on shaft 2. In .Figs. ill 2 and 3, the armature i3 is shown in attracted position, representing that current is flowing through winding '25 in such direction as to cooperate with current through windlng it to pro-" since an attraction of armature it, thereby holding knlfe'edge 3t out of engagement with tam ti and wheel ln Fig. 3 is shown a line wire th and a trans-a mitter 3t comprising a code wheel ail, a transmitting brush 3d, a start-stop cam 39, and a character key it controlling a circuit comprising battery ti, resistor t2, code wheel 37!, brush 3t, and. relay tt. 1

The operation of the species shown in Figs. 1 and 2 in cooperation with thelreyboard trans- 30 at times, two complete characters one above the mitter 38 is as follows: Normal current is from negative source through contact of deenergized relay 43, wire 35, and winding 25 to ground 44.

' Under such conditions, armature l3 will be held against core 28. Operation of key 40 releases code wheel 31 to start and to make one revolution, firing which revolution a set of code impulses is delivered from battery 4| to relay 43 which responds to the impulses individually and delivers to line wire 35 a corresponding code of impulses from positive source of energy alternating with impulses'from the normal or negative source of ,g of the spiral knife edges of fluted printing wheel 33 cooperate with lmife edge 33 of armature l3 to cause ribbon 32.to mark upon recording tape 3|. Because of the number and arrangement of spiral edges on wheel 33, Fig. 1, and the length of knife edge '30, the result upon record tape 3| will be as shown on tape 45, Fig. 6, in 'which usually one complete character and two fractional characters will be printed in response to eaclrcharacter code of received line signals, and in which other will be printed; but in which at all times at least one complete character will be printed in response to a character code of received signals.

I 'acter key 40, the code wheel 31 will stop, and the current on the line 35 will be of a polarity to energize coil 25 and retract knife .edge 3ll. At about the same time, a stop notch 3 of stop cam 8, Fig. 2, will be in alignment with .pawl Ill and since finger I2 is not lifted, for coil 25 will be energized to retract its armature I3, the shaft 5 will be stopped. thus stopping tape 3|. This completes the transmission of one character and the condition after completion is as follows: Relay 43 is deenergized, negative source at relay 43 is connected to line wire 35 which produces in winding 25, Fig." 2, an

*enrgization to hold armature |3 against core 28 and to remove knife edge 38 ,from tape 3| and printing wheel 33. Tape 3| is at rest because notch 3 on camdisc 8 has engaged pawl Ill, but the printing wheel 33 driven by motor continues to revolve. Tape 3| now is in position to receive a record of the next transmitted character code in location-adjacent t9 the. prior record, and this independently of the length of time elapsing between successive codes. During the vibration of armature |3 in response to the many impulses 'of the code signal, the start finger l2 ha been retained lifted from the armature l3 by the circular edge of cam'disc 8, which lifts pawl l8 and rocks shaft H to hold finger l2 above and out of range of the movement of armature I3.

In Fig. 3, an alternative means for controlling the starting of cam disc 8 is shown. A pair of electrical contact points 53 is provided, one of which is attached to the core 23 and therefore to the wire 5|, and the other of which is attached to spring 28 and therefore to wire 52, the circuit being completed through battery 53 and magnet 54 which controls armature 55. In normal condition with armature l3 attracted toward core 20, the contact pair 50 will be closed, thereby energizing magnet and causing the attraction of an mus armature 55 which introduces its hook end into a notch 3 of cam disc 8 and holds shaft 5 stopped, and therefore holds tape 3| stopped. Spring 88 tends to retract armature55 to release disc 8.

The operation of the species shown in Fig. 3 is as follows: With magnet 54 normally energized, armature 55 normally attracted, and disc 8, shaft 5, and tape 3| normally stopped, the first impulse received from transmitter 38 over line 35 will cause armature l3 to rise for the purpose of printing, and this will open the contacts of the pair 58 which will deenergize magnet 54, releasing armature 55 to be retracted by spring 58, thus releasing disc 8 and permitting tape 3| to start. During the several signals of, the ensuing code, the relay 54 will be energized repeatedly without effect until at the conclusion of the code the return to'normal line current from negative source over line 35 will hold contact pair 50 closed and will hold magnet 54 energized so that armature 55 will be drawn into the next notch 3 of cam disc 8 to stop the tape 3|. The advantage of this species over the species of Fig. 1 is found in the fact that at no time is any energy expended by armature 13 to start and stop the tape beyond the quantity of energy required over the line 35 to operate the knife-edge 30 to print.

No provision is made for starting the movement of the recording tape other than by response to a printing signal'received over the transmission channel, hence no special provision is made for starting the tape without printing, as would seem desirable for producing a space between words. To

separate the words ofa message and yet to maln-- tain the-facsimile receiver in simplest form, a dash, as 48 on tape 45, Fig. 6, is used as a word space and serves to separate the words of a message while at the same time its printing signals in the line channel serve to start the tape after the end of each word, thus separating the successive words and supplying a mark upon the tape to emphasize the separation.

A further species oftape' stop is shown in Figs. 4 and 5.,I'here is provided a magnet 88 3 farm 85, stoplpln 88,'and spring 81, the arm 85 being pivoted to plate 84 and spring 81 acting to urge the arm 85 against stop 88. Arm 88 projects to shaft 5 and has a screw-follower pin 88 which engages a screw thread 88 on shaft 5 and has further a striker finger 18 adapted to engage a stop pin II in disc I! on the start-stop tape shaft 5.

The operation of the species shown in Figsand 5 is as follows: Magnet 88 is connected in a manner similar to magnet 84 in Fig. 3, being in circuit with wires 5|, 8! and controlled by contact pair 58. The printing operations are asinFigs. land 2. Thetapestopandstart operations are as follows: The first printing impulse deenergizes magnet which releases armature 8| which rocks the shaft 82 which tilts the .face plate 84, Fig. 5, and lifts arm 85 and pin 88 out of screw 88, thus permitting spring 81, Fig. 4, to operate arm 85 against stop 88, thus withdrawing striker 18 from the path of, pin II and releasing disc 12 and shaft 5 to turn to drive roller 8 and thereby to drive the-recording tape. The several marking impulses of the code combination now being rece will deenergize magnet 88 repeatedly, but after the end of the character code the magnet 88 will n energized, its armature 8| willremainattractompinu will 2,14itl,264

7 remain in screw thread es, and by the action or the screw thread 69 upon the pin 68, the arm will be moved and the striker is will be positioned in the path of stop pin ii so that the shaft 5 will be arrested after an interval in which the tape willhave been driven for a distance equivalent to two or three or more characters depending upon the pitch of the'screw t9 and the setting of the adjustable stop us, the former of which is at the discretion of the manufacturer and the latter of which is at the discretion of the operator. With the tape controlling system of the species shown in Figs. 4 and 5 and with the transmitter shown in Fig. 3 operated skillfully, there will he no stoppage of tape between successive characters and a uniform printing upon the tape will secured. fins system is adapted particularly to transmission by control of perforated record forms wherein the transmission has extreme uniiormity in the feature oi time intervals. In lieu of signals for a space between words, a time interval of one character is permitted, but no mar ing signal is sent thereby permitting the tape to be driven for a distance to provide for the space between words after which the first letter oi the next word will operate the magnet til to restore arm til out of the screw thread and against its stop it where it may be maintained by successive markingsignals until another interval is per-- mitted for spacing, whici'i interval may be extended slightly and then will become a stop condition for stopping the tape by engagement of member lit with stop pin i i. r

For a more complete description of the ice-- simile printing telegraph system, reference should he made to Patents 2,046,323 and 2,il00,0il3 of July '7, 193a: and May '7, 1935, respectively.

The facsimile receiving apparatus herein described provides a receiving device of utmost simplicity in that the printing devices themselves are not subjected to starting and stopping nor to start-stop conditions of any kind and are of the simplest and strongest construction with a view to low cost and minimum maintenance. Further, in the species of Figs. 4 and 5, there is no startstop effect of any kind upon any operating mem her and a smooth and silent operation is attained.

From the previous description it is apparent that the features of the invention are to permit the heavy parts of the receiver to operate continuously and not to subject the heavy parts to starting and stopping action, to start the record lhg tape by the first character signal impulse of line current which impulse also effects printing upon the tape, to stop the tape after a travel equal ,to one printed character, using a special or dash character to indicate a space 1. In a facsimile telegraph system, a printing I wheel and a printing armature for iacsimileing letter by letter upon a record tape by control of received code combinations of marking and spacing signals, a friction drive for movi the record tape at a uniform speed, and a, stop pawl for said drive for insuring the movement of the tape through a uniform distance foreach character operation, said printing armature being operated to print and said step pawl being operated to initiate said friction drive both by the first signal of a received. code combination of markingand spacing signals.

2. In a facsimile telegraph system, a rotary mechanical printing means for facsin'iileing character by character upon a record tape by control of received combinations of marking sigs, and other means for moving the record tape, said printing means and said other means both being set in operation by the first message character line signal of marking nature received.

3. In a facsimile telegraph system, a continuously rotating printing wheel and a printing armature for facsimileing upon a record tape and operating invariably to print in response to a received marking signal, and tape control means controlled by said armature in response to received markingsignals for advancing the tape.

a. In a facsimile telegraph system, means for transmitting marking signals in code groups, an

transmitting marking signals in code groups, a

printing wheel, an armature having a presser platecooperating with said printing wheel for facsirnileing upon a record tape in response to said marking signals, driving means for said tape, and a. controlling circuit held closed in response to spacing signals and opened in response'to marking signals for setting in operation said tape driving means in response to a message character iacsimileing marking signal.

6. In a facsimile telegraph system, means for transmitting marking signals in code groups reprcsentative of message matter, rotary mechanical marking means for facsimileing upon a record tape the message matter in response to said marliing signals, and tape controlling means also responsive to one of the marking signals in a group for said message matter and adapted to move said tape in response thereto.

7. In a facsimile telegraph system, a continuously operating printing wheel, an armature operating to print in response to received marking signals and operating in response to spacing sig male to restrain the printing elements from printing, a tape driving clutch, and a tape restraining pawl, said tape restraining pawl operating in response to a spacing signal to hold said clutch. inoperative, and operating further in response-to a printing signal to render said clutch operative;

8. In aiacsimile telegraph system, a line circult, a magnet having an operating winding in= cluded in the line circuit, an armature marking member moved directly by said operating winding to mark in facsimile manner upon a record tape, an electrical contact closed by said armature member when in spacing position, and a tape stop controlled by said contact.

9. In a facsimile telegraph system, a line circuit, a magnet having an operating winding included in the line circuit, on armature marking tit tilt

member moved directly by said operating winding to mark in facsimile manner upon a record tape, a clutch for driving said tape, and an electrical contact controlling said clutch and closed by said armature member when in spacing.

I ing. to mark in facsimile manner upon a record tape, a clutch for driving said tape, a latch for controlling said clutch, and an electrical contact controlling said latch and closed by said armature member when in spacing position.

11. In a, telegraph system, a rotary mechanical facsimileing printing device, a member co-' operating. with said printing device for effecting printing of characters. on a record medium, mechanism for advancing the record medium during the printing of each character, and means responsive to a' received signal condition effective in the printing of a character for initiating the operation of said mechanism to advance the medium, after which the mechanism-operates independently of signal conditions during the printing of said character. i

12. In a telegraph system, a rotary mechanical facsimileing printing device, a member cooperating with said printing device for effecting printing of characters on a record medium, power driven mechanism for advancing said record medium during printing of each character, and means responsive to a received signal condition effective in the printing of a character for releasing said mechanism to advance the medium and thereafter said mechanism operates independently of signal conditions duringv the printing 'of said character.

13. In a telegraph system, a rotary mechanical facsimileing printing device, a member cooperating with said printing device for effecting printing of characters on a record medium, mechanism for advancing the record medium during the printing of each character, means responsive to a received signal condition efl'ective in the printing of a character for initiating the operation of said mechanism to advance the medium, after which the mechanism operates independently of the signal condition, and means for determining the period of independent operation of said mechanism, a

14. In a telegraph system, a rotary mechanical facsimileing printing device, a member cooperat ing with said printing device for effecting printing nal responsive means and thereafter independ-z.

ently thereof for having said mechanism advance said medium a predetermined distance.

15. In a telegraph system, a rotary mechanical facsimileing printing device, a-member cooperating with said printing device for effecting printing of characters .on a record medium, means for advancing said record medium during the printing of each character, means res nsive to a received signal condition effective in the printing of a character for initiating the operation of said means, and means including a friction drive'con-i trolled by said means and thereafter effective independently thereof for a predetermined period for causing said advancing means to advance said medium.

16. In a telegraph system, a rotary mechanical facsimileing printing device, a member cooperating with said printing devicefor effecting printing of characters on a record medium, means for advancing said record medium during the printing 'of each character, means responsive to a received signal condition eflective in the printing of a character 'for initiating the operation of said mechanism, means including a friction drive controlled by said means and thereafter effective independently thereof for a predetermined period for causing said means to advance said medium, and means eifective after said predetermined period for disabling said friction drive and discontinuing the advancement of the medium.

17. A method of operating a facsimile telegraph system which comprises, sending electrical facsimile scanning signals in groups, all of the .signals of each group effective as printing signals for a character, recording all transmitted signals upon a receiving strip in the form of characters, stopping the tape after each character recording at a uniform distance from the point of beginning of the facsimile character record, and causing a printing signal to start the tape.

1s. A method of operating a facsimile telegraph .system which comprises, sending electrical facstrip after each character recording at a uniform f distance from the point of beginning of the facsimile character record, and causing the first received printing signal to print and to start the strip simultaneously.

19. In a telegraph receiver, facsimileing means comprising marker means and presser means,

tape moving means, and control means for said a tape moving means operable mechanically by said presser means.

20. In a facsimile. telegraph receiver, facsimileing marker means, facsimileing presser means, tape moving means, and intermediate means controlling said tape moving means and controlled by said presser means.

21. In a facsimile telegraph receiver, facsimileing marker means, facsimileing presser means,

tape moving means, and intermediate means controlling said tape moving means and controlled mechanically by said presser means.

22. In a facsimile telegraph receiver, facsimileing marker means, facsimileing presser means, motor driven tape moving 'means, and intermediate means normally restraining said tape moving means and controlled by said presser means to release said tape moving means for operation.

23. In a facsimile telegraph receiver, facsimile marking means, facsimile pressing means, motor driven tape moving means, restraining means for said tape moving means responsive to said pressing means and positioned in a zone of movement of said pressing means, and further means effective while said tape is being moved to reduce the -movement of said restraining means.

EDWARD I". KIEINSCHMHJT,

CERTIFICATE 0F CORRECTION. Patent No, 2,1L 5,261;. January 1, 19 9.

mm]: P. mmscnmmw.

It is hereby certified that error appears in the printed specifioation' c-f the above numbered patent requiring cerrection as follo'wez Page 1, first colmnn, line 1 0 p for the word "type" read tape; line 1 1', for "charctef" reed.

character; line 1;.9, for "appaartua" read. apparatus; page}; first 9013 line 17 after the word "will" insert be and that the seidLetters Patent should be read with this correctie therein that the seine may conform to the record of the ceae in the Patent Office v Signed and. sealed. this 6th day of June, A Do 1959.,

Henrv Van Arsdale iseel) Acting Q Commissionef 'of Patents,

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