US2660617A

US2660617A - Teleprinting device

Info

Publication number: US2660617A
Application number: US175781A
Authority: US
Inventors: Hajek Karel
Original assignee: Tesla AS
Current assignee: Tesla AS
Priority date: 1949-08-17
Filing date: 1950-07-25
Publication date: 1953-11-24
Anticipated expiration: 1970-11-24

Description

Nov. 24, 1953 K. HAJEK TELEPRINTING DEVICE 2 Sheets-Sheet 1 Filed July 25, 1950 INVENTOR.

K. HAJEK TELEPRINTING DEVICE Nov. 24, 1953 2 Sheets-Sheet 2 Filed July 25, 1950 INVENTOR Jill/Lag Hug 6% Patented Nov. 24, 1953 VTELEPRINTING DEVICE Karel Hajck, Prague, Czechoslovakia,

assignor of one-half to Tesla,'national corporation, Prague,

Czechoslovakia, .vakia a corporation of Czechoslo- Application July 25, 1950, Serial N0. 175,781

Claims priority, application Czechoslovakia August 17, 1949 "7 claims. (01. 178-47) My invention relates to a teleprinting device which transforms the characters of the transmitted intelligence into a code comprising combinations of consecutive positive, negative or combined impulses.

An object of the invention is to provide an improved teleprinting device of the type mentioned above. In accordance with the invention combination bars used in my .device are not shifted longitudinally relative to the keylevers as is the case in prior art devices, but they are turned or tilted by a small angle about an axis parallel with their longitudinal axis. This turning or tilting movement is controlled by teeth provided on the keylevers, such teeth on each keylever being arranged in accordance with the code corresponding to the individual characters whichare to be transmitted.

This and other objects, advantages and novel features of my invention will be apparent from the following description when read together with the accompanying drawings in which:

Fig. 1. shows a perspective view of my new teleprinting device,

Fig. 2 shows a sectional view along line 2-2 of Fig. l, V

Fig. 3 shows schematically a plan View of the contact mechanism of my new device,

Fig. 4 shows a plan view of an enlarged detail of the cantact mechanism of Fig. 3, and

Fig. 5 shows a side view of the locking device employed in the invention.

The embodiment of my new teleprinting device as illustrated in the drawing is by way of example adapted to transmit a five number code. It comprises a, customary keyboard composed of a plurality of keylevers I which are swingable in a vertical plane. However, only one keylever I0 having a key marked Z is shown. Each keylever I0 is provided on its base edge with a particular combination of toothlike projections Ill and said combination upon different keylevers differ from each other to make each correspond to a code indicative of the character served by the respective keylever.

The keylevers I0 cooperate with a plurality of combination bars which extend perpendicularly to and below of the set of keylevers I0. In the shown embodiment adapted to transmit a five number code five such combination bars II, I2, I3, I4, I are used. However, it will be well understood that the number of said combination bars may be decreased or will have to be increased, respectively, if a code of less or of more numbers is to be transmitted.

2 Each combination bar II or turnable about its lower parallel thereto and is supported in a cradle or similar structure permitting said tilting or turning movement. In the shown embodiment each combination bar rests in an essentially V-shaped incision arranged in supports 6. movement of the bars is effected toothlike projections by the said It on the keylevers I!) as soon as one or the other keylever is pressed downand the shown'position of the bars I3, I4 the working position. 7 Each of the combination bars II through I5 actuates by means of a nose or similar member I6 and an intermediate pressure ball a stationary support I! caged in parent from Figs. 1 and 3.

When certain combination bars such as the bars II, I3, I5 are in the neutral position defined above, then the respective contacts PH, 22, 23 will" acted upon and will remain open. When, however, any of the combination bars is turned not be or tilted by the action of the projection Ill of any keylever III into the working position defined above then the nose Is upon said bar, such as the bars I 2, I4, will press upon the respective ball I? and close the contacts 22, ing from the enlarged showing in from Figs. 1 and 3, each nose I6 two slanting faces namely with a face It which actuate the respective pressure ball I! and effects the closing of the respective electric contact, and with a locking face I3 which in cooperation with the respective resilient electric contact holds the respective combination bar such as I 2, It in their working positions. The neutral po sition of the nose I6 is shown Fig. 4.

Fig. 5 illustrates the locking mechanism which temporarily holds the combination bars I I through V I5 in any position into which they have been adjusted by one of the actuated keylevers IIl. Said locking mechanism comprises a locking lever 27' EM Q F through I5 is tiltable. edge or about an axis.

The tilting the set of combination barswill' combinations as illustrated in Fig.-

I'I' one of a set of resilient electric coding contacts 2I through 25 as ap- 24. As appear- Fig. 4, but also is provided with in dotted lines in I locking lever is normally in a neutral'position I in which it does not cooperate with the combination bars. In such neutral position the projection 28 arranged upon the upper'edge of the locking lever 21 engages the said recess 29 of the cam 26. However, as soon as one of the keylevers I is pressed downward against the combination bars and the driving motor mentioned above is set into operation rotating the cam 26, the projection 28 will be forced out of said recess 29 and will slide upon the circular surface of' said cam thus pressing the locking lever 21 with its locking teeth against the combination bars so that they are held on their adjusted position until the projection 28reenters the recess 29; The rotational speed and the circumferential shape of the cam 26 are so chosen that the locking lever 21 remains in its locking position-shown in Fig. 5 during the time required for transmission of all code impulses.

While one specific embodiment of my invention has been shown and described in detail to illustrate the application of the principles of my invention, it will be well understood that the same may be otherwise embodied without departing from such principles.

What I claim as my invention is:

1. In a teleprinting device the combination comprising a keyboard serving to transmit distinct characters; a plurality of keylevers mounted in parallel, each keylever associated with one key of said board, a plurality of combination bars arranged perpendicularly to said keylevers, a support for said combination bars, said sup port having a plurality of essentially V-'shaped incisions, each incision adapted to receive one of said combination bars and to permit the same to tilt therein about its longitudinal base edge from a neutral position into a working position, a combination of toothlike projections on each keylever, each of said combination corresponding'to a code indicative of the character served by the respective keylever, said projections adapted to tilt selected combination bars within the respective incision from their neutral position into their working position, a plurality of electric contact devices each indicative of the working position of one of said combination bars, and means associated with each combination bar to actuate the respective electric contact device.

2. In a teleprinting device the combination comprising a keyboard serving to transmit distinct characters, a p-luralityof keylevers mounted in parallel, each keylever associated with one key of said board, a plurality of combination bars arranged perpendicularly to said keylevers, cradles freely supporting said combination bars for a tilting movement therein about their longitudinal base edge from a neutral position into a working position, a combination of toothlike projections on each keylever, each of said combinations corresponding to a code indicative of the character served by the respective keylever,

said projections arranged to effect the said tilting movement of selected combination bars, a plurality of electric contact devices each indicative of the working position of one of said combination bars, and means associated with each combination bar to actuate'the respective electric contact device.

3. In a teleprinting device the combination comprising a keyboard serving to transmit distinct characters, a plurality of keylevers mounted in parallel, each keylever associated with one key of said board, a plurality of combination bars arranged perpendicularly to said keylevers, cradles freely supporting said combination bars for a tilting movement therein about their longitudinal base edge from a neutral position into a working position, a combination of toothlike projections on each keylever, each of said combinations corresponding to a code indicative of the character served by the respective keylever, said projections arranged to effect the said titlting movement of selected combination bars, a plurality of electric spring contacts each indicative of the workin position of one of said combination bars, a nose at one'end of each combination bar adapted to actuate the respective electric spring contact by closing the same while the combination bar tilts from its neutral position into its working posi-' tion.

4. In a teleprinting device the combination comprising a keyboard servingto transmit distinct characters, a plurality of keylevers mounted in'parallel, each keylever associated with one key of said board, a plurality of combination bars arranged perpendicularly to said keylevers, cradles freely supporting said combination bars for a tilting movement therein about their longitudinal base edge from a neutral position into a working position, a combination of toothlike projections on eachkeylever, each of said combinations corresponding to a code indicative of the character served by the respective keylever, said projections arrangedto effect the said tilting-movement of selected combination bars, a plurality of electric spring contacts each indicative of the working position of one of said combination bars, a noseat onelend of each combination bar to actuate the respective electric contact while the combinationrbar tilts from its neutral position into its working position and a freely rotatable caged ball between the latter and the respective nose.

5. In a teleprinting device the combination comprising a keyboard serving to transmit dis tinct characters, a plurality of keylevers mounted in parallel, each keylever associated with one key of said board, a plurality of combination bars arranged perpendicularly to said keylevers, cradles freely supporting said combination bars for a tilting movement therein about their longitudinal base edge from a neutral position into a working position, a combination of toothlike projections on each keylever, each of said combinations corresponding to a code indicative'of the character served by the respective keylever, said projections arranged to effect the said tilting movement of selected combination bars, a plurality of electric contact devices each indicative of the working position of one of said combination bars, means associated with each combination bar to actuate the respective electric contact device, a locking device to hold the combination bars in their adjusted neutral and working positions, respectively, and means actuating said lockmg device to operate simultaneously with the depression of a key of said key board;

was

6. In a teleprinting device the combination ing movement therein about their longitudinal comprising a keyboard serving to transmit disbase edge from a neutral position into a working tinct characters, a lurality of keylevers mounted position, a combination of toothlike projections on in parallel, each keylever associated with one key each keylever, each of said combinations correof said board, a plurality of combination bars sponding to a code indicative of the character arranged perpendicularly to said keylevers, served by the respective keylever, said projections cradles freely supporting said combination bars arranged to eifect the said tilting movement of for a tilting movement therein about their lonselected combination bars, a plurality of electric gitudinal base edge from a neutral position into contact devices each indicative of the working a working position, a combination of toothlike position of one of said combination bars, means projections on each keylever, each of said combiassociated with each combination bar to actuate nations corresponding to a code indicative of the the respective electric contact device, a toothed character served by the respective keylever, said locking lever to hold the combination bars in projections arranged to efiect the said titling their adjusted neutral and working positions, removement of selected combination bars, a pluspectively, said locking lever being mounted in rality of electric contact devices each indicative of parallel to said keylevers, and means for dethe working position of one of said combination pressing said locking lever to bear with its teeth bars, means associated with each combination bar against the combination bars, said means operatto actuate the respective electric contact device, a in Simultaneously with the dep n of a y toothed locking lever to hold the combination of said keyboard.

bars in their adjusted neutral and working posi- KAREL HAJEK. tions, respectively, and means for depressing said locking lever to bear with its teeth against the References Cited in the file of this patent combination bars, said means operating simul- UNITED STATES PATENTS ltiarsizggilg with the depression of a key of said Number Name Date 2,121,873 Hebel et al June 28, 1938 7. In a teleprinting device the combination comprising a keyboard serving to transmit distinct characters, a plurality of keylevers mounted 2,126,846 Watanabe Aug. 16, 1938 2,262,321 Gundlfinger et a1. Nov. 11, 1941 in parallel, each keylever associated with one key FOREIGN PATENTS of said board, a plurality of combination bars ar- Number Country Date ranged perpendicularly to said keylevers, cradles 3 5, 32 France 5 1937 freely supporting said combination bars for a tilt-