US2358477A - Apparatus for selectively positioning typewheels - Google Patents

Apparatus for selectively positioning typewheels Download PDF

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Publication number
US2358477A
US2358477A US444860A US44486042A US2358477A US 2358477 A US2358477 A US 2358477A US 444860 A US444860 A US 444860A US 44486042 A US44486042 A US 44486042A US 2358477 A US2358477 A US 2358477A
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Prior art keywords
lever
detent
cam
stop
arm
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Expired - Lifetime
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US444860A
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English (en)
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Salmon Reginald Dennis
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Creed and Co Ltd
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Creed and Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L17/00—Apparatus or local circuits for transmitting or receiving codes wherein each character is represented by the same number of equal-length code elements, e.g. Baudot code
    • H04L17/16—Apparatus or circuits at the receiving end
    • H04L17/26—Apparatus or circuits at the receiving end using aggregate motion translation

Definitions

  • This invention relates to Vapparatus in which a type wheel is selectively positioned under the control of a rotatably mounted member or memof rows of stops associated therewith co-operating with a detent or detents placed successively and selectively in accordance with a code in operative relation with the rows of stops.
  • a teleprinter i. e. ⁇ a startstop printing telegraph receiver
  • a power operated typewriter of this kind is'described and claimed in British Patent No.
  • one or each of said members is provided with a plurality of different rest positions and is selectively allowed to rotate through apredetermined angle between two of said rest positions oris prevented from so rotating according to the rela-j tion between the nature of an element of said code and the rest position of said member.
  • the invention is applicable to a printing telegraph receiver as described in Patent No. 473,614 in which the typewheel makes one complete revo lution for each half revolution of a member carrying rows of stops.
  • the said member has two rest positions 180 apart.
  • the detent which is selectively moved in accordance with the nature of the first code element of the received combination arrests the said member after a rotation of 90 corresponding to a typewheel rotation of 180.
  • the member carrying the vrows of stops is provided with four rest positions 90 apart and is selectively allowed a rotation through 90.
  • the invention is also applicable to a printing telegraph receiver or to a power operated typewriter as described in British Patents, Nos. 534, 206 and 529,983 respectively in which a typewheel is rotated under the control of Vone member having a plurality of rows of stops and moved longitudinally under the control of another member having a plurality of rows of stops.l
  • a typewheel is rotated under the control of Vone member having a plurality of rows of stops and moved longitudinally under the control of another member having a plurality of rows of stops.l
  • either or both of the said members would be provided with two rest positions 180 apart. f"
  • one or each of said members is provided with two diiferent rest positions 180 Vapart and is selectively released for rotation through 180 or prevented from so rotatingaccording to the relation between theV nature of an element of said code and the rest position of said member.
  • the typewheel In the arrangements of the prior art the typewheel must be returned to an unvariable starting position before it can be released by the rst unit of the code.
  • the speed of the typewheel In the arrangements described in the British Patent 473,614 the speed of the typewheel must be at least 21/2 times that of theY cam shaft operating the detents co-operating with the rows of stops.
  • British Patents 534,206 and 529,983 there are described arrangements in which the speed of the typewheel is reduced ⁇ by proportioning the intervals allowed for the successive movements of the typewheel so as to ydecrease as the degreeof movement to be executed by the typewheel decreases and in this way thespeed of rotation of the typewheel is reduced to twice that of the cam shaft.
  • the arrangement accordingto the present invention is independent of the improvements ac,- cording to Patents 534,206 and 529,983 but may be used with the latter and if so used the speed of the typewheel is reduced to ll/gtimes that of the cam shaft.
  • the typewheel is mounted so as to rotate withv a rotary shaft carrying the various rows of stops.
  • This shaft is provided with two stops apart for dening the rest positions of the shaft.
  • a first code element of a given nature, say spacing, serves Vto release the shaft for a rotation of 180 if it is initially in one rest position
  • Fig. 1 is a perspective exploded viewof a printing telegraph receiver according to the invention, some parts being omitted for the sake of clearness.
  • Fig. 2 is a like view of feeding Fig. 1.
  • Fig. 3 is alike view of additional mechanisms 4 hich may be used 'with that of Fig. 2 forcer-V tain applications of the receiver.
  • l 4' mechanism of the receiver shown in clutch 3 from gear 4, which is driven from the l driving motor.
  • normal stop arms 5 and 6 a iirst selecting arm (positive) 1 and a first selecting arm (negativelv
  • the typewheel shaft 2 ⁇ carries 8, a member 9 having secondtselecting arms, a Y
  • member I having third ⁇ selecting arms, amember II having fourth selecting arms, and a member I2 having fifth selecting arms. It should be observed that the second, third, fourth and fifth selected members have two, four, eight and.
  • a detent lever' I V3 Co-operating with the normal stop arms al'd y 6V is a detent lever' I V3, normally held in engagement with the arm 5 or 6 by means of a downwardly extending portion/engaging with a common latch I4r against the action of spring -I5.
  • Each detent isracted uponby a spring, ⁇ tendingV to Withdraw it from the path of its.
  • associated stop Detent I6 isf provided with a third arm carrying ⁇ a bearing, in Vwhichis journalled a. pivot 22.
  • the pivot 22 carries a. cam lever'23 adapted' to cooperate with a 'cam 24 'and lprovided with a latch face 25'., This latter is adapted to cooperate with one end of acam lever 26, the other end of theleverbeing adapted to cooperate with a projection 21 carried by the frame 28, journailed on the pivot 38.
  • The' frame 28 is under the fcontrol of thereceiving electro-magnet 29.
  • the camlever -26 cooperates with a cam 30, and is journalledupon a pin 3I carried by a spring.- loaded lever 32.-
  • a similarset of lparts is provided in association with each of the remaining .detents I1, I8, I9, 2U and 2
  • learn lever 42 is carried by the pivot pin journalled inthe third arm of detent I1, and the latch face'4l onA cam lever 4-2 cooperates with one end of cam lever 39.
  • VCam ⁇ leverA 39 isgjournalled upona pin carried by a spring loaded lever 44.
  • Cani 'levers 42 and 39 cooperate with cams' 45 and 49 respectively.
  • Cam lever 23v is provided with an extension 23a, and other' similar ⁇ cam levers lsuch as'42 are provided with simi-lar; extensions, all arranged to lbe alcted upon by a common resetting lever 33,. operated by a resetting cam 34.
  • the lever 33 is provided with a pin Y35, which co-operates ⁇ with a projection on the common latch I4, which isY pivoted on rod 59 ⁇ whereby the latch may be operated when the cam llever 23 and similar cam levers are reset.4
  • a specialcam 36 is providedV4 for operatingthe normal stop arm I3.
  • a 5-hump cam 31 is provided to move the electro-magnet armature carried by the frame 28 against'the Y poles of the electro-magnet during the receipt of the middle portion of each unitof the code.
  • the shaft I Upon receipt of a starting signal, the shaft I is clutched to the constantly rotating shaft driven from the driving motor by any well known means (not shown) the typewheel shaft being held by thelever I3' in the position shown, or in a position V180" displaced from the position shown, the detent I3 being held into engagement with one or other of the arms 5 and 6 against the action of spring I5, by means of the common latch member I4;
  • the first hump on cam 31 will depressthe frameV 28 ⁇ carrying the electro-magnet armature, so as to bring the armature into conf tact Withthe electro-magnet 29.
  • the frame 28 will be held in a downward position; if no current is flowing in the winding, the frame 28 will be released so that it will return to the position shown.
  • the lcams 30 and 49 will act at the samel moment to Ipress forward the cam 25 levers 26- and 39. With the frame 28 in the position shown, i. e. away from the magnet 29, the lower end of lever 26 is clear of the projection 21, so that it will not be held thereby. Consequently, when the cam 30 presses on the hump on the lever 26, the lower end of the lever 26 will move towards the left and the spring 40 will be slightly extended, and the upper end of the lever 26 will remain firmly in engagement with the latch 25 on cam lever 23.
  • the common latch member 4 is formed with a knife edge co-operating with the downwardly extending arm of'each detent lever and the knife edge of the latch lies at an angle with respect to the edge of the detents in such a way that detent
  • Cam 45 is ineffective on cam lever 42, because this lever has been withdrawn under the action of spring 43 from the path of the hump on cam 45. Consequently, it will be seen that, if the first impulse of the code corresponds to no current in the electro-magnet 29, the common frame 28 will be in its upper position at the moment when the cams and 49 operate, and detent I1 will remain in the position shown in which it is ineffective to arrest the typewheel shaft. 'Ihe typewheel shaft will always be arrested by means of arm 1 and detent I6 if the first code element be spacing. If the typewheel shaft had been resting in a position 180 from that shown by detent I3 coacting with stop arm 6, the shaft 2 iwould be in the circumstances detailed above move into its first selecting position through half a revolution.
  • detent I1 is actuated instead of detent I6 and the typewheel shaft makes either a half revolution or practically no movement at all, depending upon whether it was held by detent I3 being in engagement with-arm 5 or arm 6.
  • Cam levers 46 and 41 are provided for the second unit of the code, and similar levers for the third, fourth and fifth units of the code. In each case, only one pair of levers is provided in contra-distinction to two pairs of levers provided for the rstrunit of the code.
  • the shaft I also carries the cams required to perform the printing and paper feed functions, the mechanism for which is not shown. This mechanism may be* the same as that described hereinafter with reference to Figs. 1 to 3.
  • the cam 34 acts on the resetting lever 33 which restores all the cam levers 23, 42 &c. into positions in which cam levers 26, 39 &c. re-engage the latch faces 25, 4
  • the pin 35 operates the common latch I4 whilst cam 36 operates the detent I3-and all the detents I3, I6, I1, I8,
  • the shaft 2 is thus freed for rotation, and it rotates until detent- I3 engages stop arm 5 or stop arm 6 whichever it meets rst. As these stop arms are positioned 180 apart the type wheel may be stopped in either of two positions 1809 apart.
  • may be actuated under'control of key board operated combination bars in the manner described in British Patent No. 529,983, the detents I6 and I1 being actuated by the same combination bar and one or the other thereof actuated according as to whether the said combination bar is moved into a given position or not.
  • a horizontal .Y shaft (not shown) is continuously driven by an electric motor and this shaft is provided with gears meshing with gears 4 and 51.
  • Gear 4 drives a type wheel shaft V2 through friction clutch 3 of any well known kind.V
  • the shaft 2 is, however, normally held stationary by one of the stop arms thereon cooperating with a corresponding detent in a similar manner to that described above.
  • Gear 51 is fixed to a shaft
  • 29 of this clutch is slidably mounted on shaft
  • Sleeve carries the cams for controlling the sequence of operations of the apparatus.
  • 29 of the toothed clutch are shown in engaged position and the sleeve I is shown as rotated a certainV amount from its normal resting position.
  • the ratchetdog extent longitudinally of sleeve I and in the rest 2 position is urged towards ratchet dog
  • magnet 29 is de-energized and the armature 28 is vmoved away from the pole pieces by the action of a spring
  • 38 fixed to the armaturev coacts with an arm
  • 31 is vnormally held against stop
  • 38- on the armature 28 moves arm
  • 31 is attached at one end to a bell crank
  • 62 rotates bell crank IBI and rod
  • the latch I 4 is part of a frame pivoted on a rod (not shown) and one side of the frame is extended to form a bell crank lever 52. Immediately after sleeve I 'commences to move a cam 34 on sleeve I acts on bell crank lever 52 to remove the latch I4 from engagement with any of the detents I 6, II, I8,
  • a cam 31 on the sleeve I acts on an extension of the armature 28 and towards the close of the start element commences to move the armature 28 towards the poles of the magnet 29.
  • a hollow in cam 3'I allows the armature 28 to be moved away from the poles of a magnet 29 by its spring I4I. If however magnet 29 is now energised it holds armature 28 in attracted position. Y This movement of armature 28 takes place for each code element of the signal, the armature being held attracted by the magnet or allowed to move away therefrom according as the signal element is marking or spacing.
  • the translating mechanism in the embodiment being described is provided with a plurality of sword members'one for each code element constructed and mounted asV described in British Patent 245,149. Two members Bla, 6
  • 56y carries a frame 65 having two depending arms 64; As soon as the position of the armature li'as beendetermined a cam
  • 'I'his frame 65 is formed with a knife edge and a knife edge
  • Each of the cams 03a, 63h is in two parts.
  • the sword extension 66 to be positioned in accordance with the next code element.
  • the lower cam moves the sword member towards a corresponding detent.
  • the sword member Sla for the first element of the code cooperates with two detents I6 and II cooperating with stop arms 'I and 8 on the type wheel shaft. If the sword member 6ta, is set in marking position it actuates detent I6, if in spacing position it actu- Whichever of the detents I6, I'I is acted upon by sword IIa moves latch I4 in a clockwise direction and soy releases detent I3. lTlhe latch I4 is restored to hold detent I6 or I'I whichever has been actuated in new position and all other detents out of the path of the corresponding stop arms. As detent I3 is released the type wheel shaft commences to rotate and according to the relation between the position of the type wheel shaft and the nature of the first code element it is allowed to move only a very small fraction of a rotation or through 180.
  • detent I3 in engagement will stop arm f6.
  • detent IB were actuated fora marking element, the type wheel shaft would rotate through 180 until detent I6 en gaged stop arm I6. If detent I'I were actuated bya spacing element, the type wheel would only rotate a very small amount and would be arrested by engagement of detent I1 with stop arm 8.
  • the sword member SIb for the second code element is moved similarly to sword member 6 a.
  • the sword member 6Ib cooperates with only: Va single detent I8 which it engages only if it has been set by a spacing element of the code. If the second element of the code be marking sword member SIb is set in a position in which it does not lengage detent I8 and the type wheel shaft is not in that case released.
  • detent I8 cooperates with two stop arms 9, detent ISvwith four Vstop ⁇ arms I0, detent 20 with eight stop arms II and detent 2
  • the latch I4 is disposedwith detents I3, lo, n, ls, Is; 20 and similar to that in the embodiments previously described.
  • 3 can accordingly be moved past latch I4 at the commencement of a cycle of operations without moving thelatch'far enough to'release any other detentthat ⁇ 'is 1'n position, but any detent subsequentlyactuated latch I4 is moved to release detent I9 or detentA Y will release any previously actuated detent.
  • the periods between the times atwhich the sword members act upon their corresponding detents preferably decrease as ⁇ Athe degreeof movement to be executedzby the shaft 2 decreases and accordingly eachsword member is restored y to an intermediate position after b eing set by;
  • Thecharacter selected is on two paper ⁇ lever A ⁇
  • Bellrank 95 is rotated by spring 96 andpawl '10; rotatesratchet wheel 69 bythe space of onetooth.
  • - Ratchet wheel .69 is ⁇ fixed on spindle Gland Ythus the paper isfed by thespace Y of one charactenf Y,
  • shift signal sets the type wheel shaft'2 fin achar'- r acteristic. positionas in the case. of. any. other signal.j.'1he type wheel :
  • Sleeve 60 carries a plate
  • thereon strikes-'a lever
  • Printing and paper' feedingoperatio'ns are carried out in the following manner.” Whilst the type wheel is being rotated in aecorlance' with? TOOK a frame
  • 68 is -fed from a mechanism (not shown) described in United States VPatent No e2l,090,811, the feeding pawl'bei-ng actuated by means .of a 4bell crankA (not shown) moved by arm 9
  • the jockey roller 80 is'. forced out of engagement with the sleevetGIl-.andtlever 118. is; Vrotated ⁇ in an anticlockwise direction against spring Lever
  • latch 89,-. ⁇ :Latch 89 moves anti-clockwise about its pivot 16; 'so that, as' lbelL crank Y8l ⁇ moves anti clockwise withlever18,5,"it5willnot be arrested by latchV 89 and will not release'lever 90;
  • 4 is provided with one sixth ofthe number'of'teeth on ratchet wheel 69,'in'the present case four teeth to 24 teethy in'y wheel
  • a device has been provided, whereby when the machine forms part of aftransmitter and receiver' and a local record of transmitted -messages'is-notr required, the paper feedingrmechanism-rnaybef put out of action.
  • This device is associated Vwith the send-receive switch vso that the'- device' can only be operated when the switch isin send position.
  • a printing telegraph receiver comprising a .rotatable typewheel and mechanism responsive,l to a received signal sequence for rotating the ⁇ type wheel into selectedprinting position comprising a rotary selector unit associated with the typel wheel including a series of stops, aY series of-fdetents each associated with a stop, and means responsive to the signal sequence elements for selectively shifting said detents into stop engaging'position, at least one of said detents beingY provided with a yieldable joint arranged to preduring said shift.
  • 20 is fixed on aro'd
  • 201 is normallyheld by spring-I I2I inengagement vwith bell cranktle'ver'82 and when cam
  • the spindle IIB is coupledto' the operating rodof the send-receive switch.
  • A'v printing telegraph receiver comprising'a rotatable type wheel, and'mechanism responsive ⁇ to a received signal sequence for rotating the type wheel into selected printing position
  • a rotary selector unit associated' with lthetype wheel, an intersignal-stop device arranged Ito stopV the selector in either of two positions between signal sequences, and aseries'ofselective stop ciated with" a' given stop; and means; respon'sive to; the signal sequence elements fori selectively shifting said'detents into stop engaging position, a detent actuating member associated with each given'detent, -meansl responsive to a signal eley Vment'for ⁇ selectively setting veach actuating member in' and out ,of operative' position; and means forthereafter operating said actuating member,
  • said'last-mentionedfmeans for'operating the actuatingz members A operating successive members at ⁇ ,decreasing time intervalscorre's'ponding to y said decreasing angles.
  • a printing ltelegraph receiver' comprisinga rotatable typefwheel, mechanism responsive to a received signal sequencefor rotating theV type wheel into ⁇ selected printing-position and meansHV forllongitudinally/shiftingfthe type wheel including a'longitudinally movable: and rotatable type wheelsupport, longitudinallytmovable actuating means adjacent the support,means for movingsaid 4actuating means upon the reception of each signal sequence, andv'meansjresponsive to a signal sequence for shiftinglsaid type wheel support selectively into and out of position for engagement by said actuating member.
  • a printing telegraph receiver for printing ve unit code messages comprising printing mechanism, means responsive to successive received signal sequences for selectively actuating the printing mechanism to print a character for each sequence, means for feeding a. tape past the printing mechanism by steps corresponding to the receipt of signal sequences, and means for automatically feeding the tape an extra step after the printing of five characters thereon.
  • the tape feeding means comprises a ratchet, an associated pawl, means for actuating the pawl once for each signal sequence received to advance the tape one step, the extra step feeding means including a second ratchet and an associated pawl, and means for disabling the second pawl and thereby eliminating automatic spacing between code units.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Accessory Devices And Overall Control Thereof (AREA)
  • Common Mechanisms (AREA)
US444860A 1941-07-07 1942-05-28 Apparatus for selectively positioning typewheels Expired - Lifetime US2358477A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB8566/41A GB550495A (en) 1941-07-07 1941-07-07 Improvements in or relating to apparatus for selectively positioning a typewheel

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US2358477A true US2358477A (en) 1944-09-19

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BE (1) BE475402A (xx)
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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2458734A (en) * 1943-12-08 1949-01-11 Teletype Corp Mechanical ciphering system
US2551693A (en) * 1943-04-16 1951-05-08 Roclof M M Oberman Receiving device for teleprinters
US2555622A (en) * 1948-05-25 1951-06-05 Teletype Corp Printing telegraph apparatus
US2562825A (en) * 1949-04-15 1951-07-31 Segaar Cornelis Receiver for teleprinters
US2771599A (en) * 1953-03-06 1956-11-20 Marchant Calculators Inc Readout mechanism
US2847505A (en) * 1954-12-01 1958-08-12 Int Standard Electric Corp Device to drive circular type-carriers
US2911472A (en) * 1954-05-03 1959-11-03 Griffith Ronald George Type positioning mechanism of telegraph printing apparatus
US3210471A (en) * 1945-12-20 1965-10-05 Teletype Corp Printing telegraph apparatus
US3307676A (en) * 1965-12-30 1967-03-07 Ibm Printing apparatus with type wheel disconnected from selection means during return to home position

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2551693A (en) * 1943-04-16 1951-05-08 Roclof M M Oberman Receiving device for teleprinters
US2458734A (en) * 1943-12-08 1949-01-11 Teletype Corp Mechanical ciphering system
US3210471A (en) * 1945-12-20 1965-10-05 Teletype Corp Printing telegraph apparatus
US2555622A (en) * 1948-05-25 1951-06-05 Teletype Corp Printing telegraph apparatus
US2562825A (en) * 1949-04-15 1951-07-31 Segaar Cornelis Receiver for teleprinters
US2771599A (en) * 1953-03-06 1956-11-20 Marchant Calculators Inc Readout mechanism
US2911472A (en) * 1954-05-03 1959-11-03 Griffith Ronald George Type positioning mechanism of telegraph printing apparatus
US2847505A (en) * 1954-12-01 1958-08-12 Int Standard Electric Corp Device to drive circular type-carriers
US3307676A (en) * 1965-12-30 1967-03-07 Ibm Printing apparatus with type wheel disconnected from selection means during return to home position

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Publication number Publication date
FR933315A (fr) 1948-04-16
GB550495A (en) 1943-01-11
BE475402A (xx)

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