US2165247A - Teletypewriter - Google Patents

Description

July 11, 1939.

c. J. FITCH ET AL TELETYPEWRITER 4 Sheets-Sheet 1 Filed Dec. 2, 1936 ATTORNEYS.

J i 1939- v c. J. FITCH ET AL I 2,165,247

TELETYPEWRITER Filed Dec. 2, 1936 4 Sheets-Sheet 2 A TTORNILYS.

' F IE4.

July 11, 1939. v c. J. FITCH El AL 2,165,247

TELETYPEWRITER Filed Dec. 2, 1936 4 Sheets-Sheet 3 HIIM- 35% v INVENT RS TTORNEYS.

Jul 11', 1939.

Filed Dec 2, 1956 I FIG] F IG.7A.

FIG. 70.

C. J. FITCH ET AL TELETYPEWRITER' I FIG.7D, ",6

'FIGJE.

4 Sheets-Sheet 4 Mum s.

20 inafter set forth and claimed:

Patented July ll, 1939" TEIETYPEWRITEB cm. I. Fitch and Kurt n. Schneider, Endicott,

N. 1., assignors to International Business Machines (hrporation, New York, N. Y., a corporation of New York Application'necember 2. 1m. Serial No. 113,199

13 (ilaima. (c1. 178-23) This invention relates typewriters and more particularly to typewriters for use. as a receiving or recording unit in remote control systems such as for example printing telegraph systems and 6 the like.

It isan object of the present invention to pro.- vide a simplified and positive permutation bar system associated with the character keyboard of a typewriter and'adapted to operate a key bar l in accordance with the permutation or combinational signals received thereby printing the selected character.

Various other objects and advantages of the invention will be obvious from the following particular description of oneform of .mechanism' embodying the invention or from an inspection of -the accompanying drawings; and the invention also constitutes certain new and useful features of 'construction and combination of parts here- In the drawings:

' Fig. 1 is a cross sectional view of one type of power operatedtypewriter and the associated permutation bar unit. The cross section of the said unit is taken along lines l-l of Fig. 2.

Fig. 2 is a plan'view of the permutation bar unit.

Fig. 3 is a detail view of the controlling clutch unit taken along lines 2-! of Fig. 2.

' Fig. 4 is a detail view of the drive gears for the bars. Fig. 5 is an exploded view 'ot-a permutation bar clutch unit.

Figs. 6 to 6-3 are detailviews of the clutch unit.

Figs. 7 to 7--E are detail views of the permutation bars.

For illustrative purposes, this invention is shown as-embodying a well known form of rei cording unit, which may be the Electromatic typewriter, and hence requires only the following brief description.

Refen'ing to the drawings and particularly to Fig. 1, in the embodiment illustrated in the drawing. well known means are provided for actuating the type bars (not shown) by power operated devices comprisfng a power driven roller II.

A cam II .is pivoted on one arm of a bell crank lever l2 pivoted in the frame, the other arm of which is operatively connected with one arm of a bell crank lever l2 by means of link H. The other arm of lever i3 is connected to the type bars (not shown) in a well known manner.

' The lever I2 is actuated by the cam l I when the latter" engages the driven roller ID to. be

operated thereby. The engagement of the cam I l with the power roller is controlled by means of the key lever I! in a manner which will now be described.

The cam II is resiliently engaged by a springpressed arm which tends to turn it into enon-a lever 22 pivoted on the bell crank l2 and normally arranged in the path of a lug on the .cam. When the lever 22 swings to move its stop out of the path of the lug, the arm 20 swings the cam into engagement with the power roller to be actuated thereby to swing the bell crank I! to actuate its connected mechanism.

The lever 22 has an arm 24 projects laterally through an opening in the bell crank l2 and engages the bifurcated lower end 26 of an arm 21 of a key lever l'l pivoted on the common rod 28.

It is obvious then that depression of a key lever i'l releases the revolubly mounted cam II to engage and be actuated by power roller 10 in turn operating bell crank 12 and its attached links to cause the associated mechanism, such as the key bars and other operating mechanisms, to be operated; v

The associated permutation bar mechanism will now-be described and by referring to Figs. 1 and 2 is shown to comprise generally a plurality of round slotted shafts or bars 35, the slots 26 of which are arranged diametrically opposite one another. The said bars are normally maintained inoperative so that the control levers 21, one for each key bar and attached thereto, by link 31-41, are locked in an inoperative position.

Gear units 4| (Fig. 4) are provided at each end' of the' permutation bar device, comprising three sets of gears, one foreach shaft or bar 35. Thegears 32, 39, and 4-0 are rotated continuously by drive gears 42 and are connected to the associated bars by individual clutches 43 (Fig. 5) to drive said 'bars one revolution. The clutches 43 are controlled by magnets 44 which are energized by control signals and in combinations in accordance with the perferred permutation code. During the rotation of the selected bars 35 certain slots 28 disposed thereon are presented .under the control levers 31 so that one control lever is selected and permitted to drop in the channel provided by the slots which are in alinement, operating the control lever and its attached key bar lever, thus causing the character to be recorded.

hich is.provided L with an offset projection 25 at its end which 'gagement with the power driven roller or stop 2| o -ported by members 69 attached to the supporting casting it. Individual springs 5b are attached to the levers 3'! to urge the levers against the permutation bars 35. The levers 31 at the other ends thereof are linked to the key bar connecting links 31-41, and therefore it 'will be seen that upon depression of a control lever 31 by spring 5b the link 3'la will be moved downwardly to lower the attached key'bar and causing the associated type bar to be operated The levers 37 are kept I in correct alinernent by means of the comb member 56 attached to the said supporting casting.

The entire supporting casting id is pivotally secured to members 5i so that the entire permutation bar unit may be rotated about the pivots 552 (Fig. 2) by removing nuts 53. The pivot line through the hinges 52 is in line with the center of attachment of links 3l--a and levers 3i so that the said unit may be hinged downwardly without disturbing the link connections to the key bars.

The permutation bars are slotted in accordance with any desired permutation code, the slotted bars are shown in detail in Figs; 7 to 7-E, the slots as shown are arranged so that upon rotation of certain of the bars, one control lever 3? is selected and permitted momentarily to be depressed into the slots by spring 50 thereby depressing the attached link d'i-a and key bar ll. Referring to Fig. 1 it will be seen that the rotation of bars Nos. 2, 4, and 6, will cause the slots of all the bars to be alined under the particular control lever 31 shown, thereby permitting said lever to be lowered into the slots momentarily to depress the associated link and key bar, causing the corresponding type bar to individual stud-shafts 56 (Fig. 5) upon which are mounted ratchet gears 57. Associated with each ratchet gear 51 is a clutch unit :33 which is secured to the permutation bar '35. A clutch unit is provided for each bar. The principles of operation of the sets of clutch units and gearunits are identical and consequently only one set need be explained. It will be seen from Fig. 4 that the directions of motions of the clutch gears 38, 38,

and $03 are different, and because of this fact the clutches t3 are made right-hand and" left-hand to correspond thereto.

A controlling magnet M is provided for each clutch 53. Referring to Figs. 3 and 5, the magnet' M is provided with an armature t8 secured to a clutch stop arm bl. The said arm, while the magnet M is deenergized, is adapted to engrease? as to receive the toothed dog 63. A spring post 66 is fixed in the said member '65 and acts as a guide for spring 66. The dog 63 is shaped was to fit over the said spring and spring post and when mounted in the channel provided in the housing member 65 it is seen that the spring 66. tends to urge or maintain the dog 63 to the right as viewed in Fig. 6A. The dog 63 and housing member 65 are recessed so as to receive the dog lift lever 62 which when inserted in the housing member is adapted to be rotated slightly or pivoted about one end thereof. The other-end of the dog lift extends beyond the housing memher and is arranged to engage the stop arm 6| whenever magnet 44 is deenergized. Movement of the dog lift lever 62 moves the recessed; dog 63 and when blocked by the stop arm 6| asshown in Fig. 5 positions the dog 63 to the extreme left hand position against the actionof spring 66. I

. gagement and the path of dog lift lever 62. The

spring 66 then forces the dog 63 to the right as viewed in Fig. 5 into engagement with the constantly rotating ratchet gear 5i.

The signal condition impressed upon/the magnet 64 lasts momentarily, so that the stop BI is positioned 'in the path of the dog lift lever 62 before one'revolution of the clutch has been completed. As the clutch is rotated by the gear 5? and completes its revolution the dog lift lever engages the stop 6i, and as the clutch continues its rotation with the lift lever 62 held stationary by the stop hi, the said lift lever is rotated about its end positioned in the housing member 65 to slide the toothed dog 63 out of engagement with the ratchet gear 51. When the tooth 641s brought out of engagement with the said ratchet, driving poweris removed from the clutch and permutation bar. The spring 66 within the dog 63 normally would have a tendency to rotate the permutation bar in a reverse direction and permit the tooth lit to again engage the ratchetgear;

however, as previously explained the clutch and bar 35; are locked in the inoperative position by means of the. stop 51. Due to the relative high speed of operation, when the toothed dog is forced out ofengagement with the ratchet by means of the stop 6!, the momentum of the rotating permutation bar and clutch is sufiicient to rotate the bar and clutch slightly beyond theposition where the tooth 6% just becomes disengaged from the ratchet gear; this carry-over is sufficient to permit the spring-pressed stop 61 to engage the notch 63 locking the clutch and bar against reversed rotation and insuring suflicient clearance between the dog tooth and the ratchet so as to prevent chattering.

The remainingpermutation bars are rotated in a like manner upon energization of the associated clutch magnets 54. The magnets are energized practically simultaneously so that when a particular combination of signals-causes certain of the magnets to be energized, the corresponding permutation bars are permitted to be rotated one revolution, permitting one control lever 3V to drop in. the alined slots on the permutation bars, thereby recording a character on the power operated typewriter accordintzly.

The design of the permutation bar unit should be such that the stroke of the lever 31 is about twice as great as necessary to operate the typewriter key bar. In this manner the clutches are permitted a wide margin of operation and provides suflicient tolerance to allowfor variations in timing of the difierent magnets due to variations in time of arrival of the signals. With reference to Fig. 1, it is seen that when the permutation bars 2, I, and 6 rotate one revolution, the first 90 thereof the levers 31 are all maintained in a locked position, the next 90 permits the selected lever to be pull'eddownwardly by spring 50, the next 90 locks up all the levers again and during the last 90 the bars are positioned as shown in the normal position. It is seen, therefore, that upon reception of a signal the bars are rotated, but even in this event all the control levers are maintained in a locked position except the selected one, in this manner making it impossible to depress more than one control lever and its associated key bar at a time. I

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 illustratedand in its operation may be made by those skilled in the art without departing from the spirit of the invention. Itis the intention therefore to be limited only as indicated by the scope of the following claims.

What is claimed is as follows: 1. A device of the character described comprising, in combination, a keyboard comprising a plurality of operable key bars, a plurality of rotatable permutation members associated thererotation of said members.

3. A device of the character described comprising, in combination, a keyboard comprising a plurality of operable key bars, a plurality of rotatable permutation members, and means to rotate certain combinations of said members simul taneously, including means to rotate the members one revolution, and means to effect selection of certain of said key bars upon rotationof the permutation members.

4. A device of the character described comprising, in combination, a plurality of operable control members, a plurality of rotatable permutation bars, electromagnetic means to control the rotation of combinations of said bars, and means to effect selection of certain control members including means to effect said selection during the rotation of said bars.

5. A device of the character described comprising, in combination, a plurality of operable control members, a plurality of rotatable permutation bars, electromagnetic means to control the rotationof combinations of said bars, means controlled by said electromagnetic means upon momentary operation thereof to limit the rotation of said bars one revolution, and means to eflect selection of a control member including means to effect said selection during the rotation of the bars;

6. A device of the character described comprising, in combination, a keyboard comprising a plurality of operable key bars, individual control members associated with each key bar, a pluralityof normally inoperative permutation members, means to operate certain of said permutation members, and means to select a predetermined control member determined by the positioning, of the permutation members including means to eifect the said selection immediately upon positioning of the permutation members thereby effecting operation of the associated key bar.

7. A device of the character described comprising, in combination, a keyboard comprising a plurality of operable key bars, individual control members associated with each key bar, a plurality of normally inoperative permutation members, means to rotate certain of said permutation members a predetermined timed interval,-

plurality of operable key bars, individual control.

members associatedwith each key bar, a plurality of normally inoperative permutation bars, and means to rotate certain of said bars one revolution and means to select a certain control member during the rotation of the permutation bars thereby effecting operation of the associated key bar.

9. A device of the character described comprising, in combination, a keyboard comprising a plurality of operable key bars, individual con: trol members associated with each key bar, a plurality of normally inoperative permutation bars, means comprising electromagnetic means to control the operation of certain of said bars, and means to select a certain control member determined by the positioning of the permutation bars including means to eifect said selection during the positioning of the permutation bars thereby effecting operation of the associated key bar.

10. A device of the character described comprising, in combination, a keyboard comprising a plurality of operable key bars, individual control members associated with each key bar, a plurality of normally inoperative permutation bars, means adapted to rotate said bars, means comprising electromagnetic means, upon energization thereof, to render the rotating means eil'ective to rotate certain of said bars and means to select a certain control member determined by the positioning of the permutation bars and during rotation thereof thereby efiecting operaeffect rotation of certain of the permutation members by the driving means for a pre-determined timed interval; and means to efiect the selection of certain of the control members during the rotation, of the permutation members.

prising in combination, a, group of normally inoperative rotatable permutation members, a plurality of control members associated therewith, continuously rotating driving means, signal control means to eflect connection of certain of the permutation members to the said driving means,

thereby efiecting rotation of the said permutation members, and means to effect selection of the control members during the rotation of the permutation members.

CLYDE J. FITCH. KURT R. SCmiEIDE-R.

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