US2278981A - Teleprinter unit - Google Patents

Description

April 7, 1942. c. J. FITCH ET AL 2,278,981

Y TELEPRINTER UNIT Filed Dec. 18, 1940 2 Sheet s-Sheet 1 FIGJ.

I g gm TORS B Y ATTORNEY April 7, 194? c. J. FITC'H Em. 2,278,981

TELEPRINTER UNIT Filed D90. 1 8, 1940 V 2 Sheets-Sheet 2 HM FIG.2.

.sig/za/ [Jae A I j Q INV o 5 A T TORNE Y Patented Apr. 7, 1942 TELEPRINTER UNIT Clyde J Fitch, Endwell, and Kurt R. Schneider,

Endicott, N. Y., assignor s to International Business Machines Corporation, New York, N. Y., a corporation of New York Application December 18, 1940, Serial No. 370,677

4 Claims. (Cl. 178-33) This invention relates to teleprinter units, and more particularly to such units for use as a receiving or recording device, in remote control systems, such as, printing telegraph systems and the like. A suitable system employingthe present unit is described in co-pending application Serial No. 370,675, filed Dec. 18, 1940.

The present invention constitutesan improvement of the receiving unit, described in U. S. Patent No. 2,165,247, which unit comprises a plurality of rotatable permutation members, which are released, upon successive energizations of the control magnets, in combinations, corresponding to the code groups of impulses impressed upon the said magnets, thereby effecting selection of predetermined character type elements.

It has been found, that in certain types of printing telegraph systems, the timed impulses are received, at too slow a rate, for effecting proper control of the unit referred to, therefore, in the present application, it is suggested, to store the received impulses directly in the unit, until all the impulses of the code groups are received. Upon receipt thereof, an additional control magnet, termed the print magnet is provided I to release the permutation members, simultaneously, to effect the character selection.

Therefore, one of the objects of the present invention resides in the provision of storage means associated with the individual permutation members for storing the received signals of the code groups.

Another ,object of the present invention resides in the provision of additional control means for releasing the permutation members, simultaneously, in accordance with the stored signals. Other objects of the invention willbe pointed out in the following description and claims and illustrated in the accompanying drawings, which, disclose, by way of example, the principle of the invention and the best mode, which has been contemplated, of applying that principle.

In the drawings:

Fig. 1 is a plan view, partially in section of the. 45

In this manner, the dog I02 is held in a position, so that its tooth is prevented from engaging the,

dog lifting lever Of the clutch unit.

Fig. 4 is a wiring diagram showing the schematic circuit connections of a receiving system employing the teleprinter unit.

In certain types of printing telegraph systems the timed signals are initiated and, transmitted at too low a frequency rate, and consequently the timed signals are received at too slow a rate to. operate satisfactorily the printer unit referred to in U. S. Patent No. 2,165,247. To overcome this condition, certain modifications of the structural details of this unit have been suggested, whereby the received signals are stored by the control clutchunits associated with the permutation bars. Upon receipt of the signals of each combination, a print control magnet is energized to effect the selection of the character type elements and recording of the characters. reference now to Figs. 1-3, and 3a, the changes referred to will be described. 7

The rotatable permutation bars I00, of which six are shown, are provided with individual clutch. units, comprising an annular member IOI, secured to a related bar, which member is shaped to receive a movable dog I02.

out of engagement with the associated ratchet wheel 104. A pivoted dog lift lever I05 is provided to control the positioning of the dog, and

" cated by the reference character I08, aredriven to effect continuous rotation of the individual gears I09, and the related stud shafts I III, which shafts in turn causethe rotation-of the associated ratchet wheels I04.

Referring now to the dog lift lever I05, it is noted, that two individual stops II I and H2 are formed thereon, and arranged one belcwthe other in offset positions with respect to each other.

H3 in one side thereof, so thatthe uppermost section I I4 of the stop arm can engage the upper stop III of the dog lift lever. I05, whenever the armature I0! is in a released position as shown.

associated rotating wheel, and consequently, pre-,

venting the associated permutation bar from be.

ing rotated or operated.

. Now, upon energization of the related control magnet, for example magnet MI, the stop arm I06, as viewed in Fig. 3, is partially rotated in a.

clockwise direction, thereby resulting in the disengagement of the stop section H4 and upper With I The said dog is, provided with a single tooth I 03 normally held.

The upright section of the cooperating stop arm I06 is provided witha U-shaped slot stop II I of the dog lift lever, and the engagement of the said stop section with the lower stop H2 of the dog lift lever. This resultant action is quite similar to actions of well known escapement mechanisms. The escapement action is positive, due to the fact, that the dog 102 is constantly urged, by spring means (not shown in the present application but described in detail in the Patent 2,165,247), in the direction of the ratchet wheel. The stop arm I06 is retained in the shifted position, by means of a frictional lock, comprising the spring urgedball H 5 engaging the uppermostnotch H6 formed in the side. opposite the one-with the slot' [13 of the upright section of stoparm.

ance with the code signals impressed upon the control magnets MIM6.

While there has been shown and described and pointed out the fundamental novel features of the invention as applied to a single modification it will be understood that various omissions and substitutions and changes in the form and details of the device illustrated andgin its operation may be made by those skilled in the art, without departing from the spirit of the invention. It is the intention, therefore, to be limited'only as indicated by the scope of the fol- Q lowingclaims.

It is evident now, that, as the control signals are impressed upon the individual magnets Ml-MS to effect energization thereof, the said signals are effective to cause the controlled clutch units to be shifted as described, and store the corresponding signals until the clutch units are released completely to effect rotation of the related permutation bars. A diagrammatic show ing of suitable signal receiving means. is shown in Fig. 4, wherein the reference character 'l2l designates generally a receiving distributor, either of. the start-stop or continuously operated type. The code groups of impulses are impressed upon magnets MIM6', successively, by means of the rotating brushes I22, to cause these timed impulses to be stored by the said clutch units. The print magnet MP is energized, by means of the local power source I23, upon receipt of all the impulses of each code group.

The release of each clutch unit is under control of the print magnets MP, only one ofwhich is shown, however it will be understood, thatv one print magnet is provided for each group of three control magnets included in the. printer unit. The said print magnet is mounted. below. the related group of control magnetaand is provided with a pivoted armature I I! to which an extension arm 8 is. secured, there being an extension arm for each related control magnet. Thesaid extension arms are adapted to engage the 'displaced or shifted stop arms I06, upon energization of the print magnet MP, to re: storethe said. arms torthe normal position shown. Upon restoration of a stop arm I06, the uppermostsection H4 thereof is disengaged from the lower stop H 2,. thereby releasing the dog lift lever H15. and. permitting ,the tooth of the dog 102 to,

engage the related ratchet wheel. This operation results in the rotation 'of the, associated permutation bar. Upon completionjof a revolution of the bar and clutch unit, the upper stopf ill" of the dog lift lever again engages the uppermost section 14 of the restored stop' arm, to efie'ct disengagement of the, said dog tooth and ratchet. Thus, it'is seen, that all the shifted clutch units are released, upon energizati'onof the associated print magnet to effect rotation. of the related permutation bars, after the different signals of the permutation combi mations are receivedand stored. l i Each, permutation bar I00 is provided with a What is claimed is:

1. A device of the character described controlled by variably timed groups of signals comprising, in combination, a plurality of normally inoperative rotatable permutation members, means capable of rotating the said members upon the release of the latter, a plurality of control members, means to efi'ect selection of certain of the control members during the rotation of the permutation-members, control magnets, one for each permutation member, means controlled by the magnets for storing the code groups of signals, and means, efiective upon receipt of each group of signals, for efiecting release of combinations of permutation members,

, simultaneously, in accordance with the stored signals.

2. A device of the character, described controlled by variably timed groups of signals comprising, in' combination, a plurality of normally inoperative rotatable permutation members,

continuously rotating driving means, clutch units, one for each member, each unit including signal storing means, control magnets, one for each clutch unit, responsive to the received groups of signals, for controlling the storing means to effect storing of the received signals, and'meansfor controlling the clutcli units, upon receipt of each group ofsignals, to efiect con nection of combinations of members, simultanedrama the said driving means, inaccordance .45

with the'stored signals. ,5 v

3. A deviceof the character described controlled by variably timed groups of signals comprising, in combination; a plurality of normally inoperative rotatable permutation members,

mally inoperative'rotatable permutation memplurality of diametrically opposed slots H9,

which bars upon rotation, in permutative groups, present'certain of the said slots under the controllevers I20, so that one control lever is serected, and permitted to drop in the channel provided by those slots which are in alignment.

The; selected control lever is theneffective to operateits attached key bar lever (not shown) ,to cause the character to berecorded, in accordbers, means capable of rotating the said members' upon the release ofthe latter, control magnets, one for each permutation member, and

individual means controlled by the said magnets for controllingthe release of said members whereby the latter areyrotated by the first mentioned means,'sa'id controlled means including signal storingfmens for storing the received code grcupsof signals. V

- a v C Y -J: FITCH;

KURT R." SCHNEJDER'E

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