US2571182A - Vertical tabulation mechanism for telegraph printers - Google Patents

Description

Oct. 16, 1951 E. T. BALDWIN 2,571,132

VERTICAL TABULATION MECHANISM FOR TELEGRAPH PRINTERS Filed June 10. l949 2 Sheets-Sheet 1' INVENTOR EDWARD T. BALDWIN ATTORNEY E. T. BALDWIN Get. 16, 1951 VERTICAL TABULATION MECHANISM FOR TELEGRAPH PRINTERS Filed June 10. 1949 2 Sheets-Sheet 2 FIG. 3

INVENTOR EDWARD T. BALDWIN BYE-L47 ATTORNEY Patented Oct. 16, 1951 VERTICAL TABULATION MECHANISM FOR TELEGRAPH PRINTERS Edward T. Baldwin, River Forest, 111., assignor to Teletype Corporation, Chicago, 111., a corporation of Delaware Application June 10, 1949, Serial No. 98,233

15 Claims.

This invention relates to printing telegraph apparatus and more particularly to paper" feed mechanisms for such apparatus.

The general object of the present invention is to provide a signal controlled mechanism for use in printing telegraph apparatus and the like, for

cipal features of the invention;

rapidly advancing the paper any predetermined distance.

The present invention is applicable for use on any of the page type telegraph printers in common use at the presenttime. In the present embodiment, which is merely one of the possible forms the invention could take, the platen is urged rotatably continuously through a friction clutch, an escapement mechanism being provided for controlling the rotation of the platen. Normal line feed operations for spacing the paper between successive lines of printed intelligence, are accomplished in a conventional manner by a signal responsive function lever which actuates the escapement mechanism. A stop wheel is provided which has a plurality of manually settable stopsor stop pins which are each positionable to either a form feed out position Or a vertical tabulating position. Upon receipt of a vertical tabulation signal the platen is advanced and the stop wheel is rotated therewith until the first stop in vertical tabulation position is effective to cause the escapement mechanism to stop the platen. A form feed out signal similarly causes rotation of the platen until the stop pin in form feed out position causes the escapement mechanism to stop the platen.

Another object of the present invention is to provide a form feed out mechanism which is readily adaptable for use with different length forms by the mere manual displacement of a stop in a stop wheel.

Another object of the invention is to provide a mechanism for simplifying the printing of forms of uniform length by enabling the rapid advancement of the form between successive sections thereof in response to a special signal. This feature of the invention renders it particularly adaptable under conditions where it is desired to print limited amounts of information on various portions of the form. Due to the ease with which the manually operable stops may be set, the present invention renders itself adaptable for remote controlled printing of forms having blank spaces thereonto be filled up with transmitted information.

Another object of the invention is to provide a means for feeding a fixed amount of paper out of a cabinet or cover at the end of 'a message in response to a predetermined signal.

The above and other objects and advantages of the invention'will be apparent from the follow ing detailed description when taken in conjunc tion with the accompanying drawings wherein;

Fig. 1 is an isometric view showing the prin- Fig. 2 is an end view of the invention also showing fragmentarilya portion of the function mechanism; T

Fig. 3 is a fragmentary view of th platen and its drive mechanism; and 7 Fig. 4 is a detail view, partly in section, of the stop wheel.

Referring now to the drawings a platen II is mounted suitably on a shaft l2 rotatable in the printer frame (not shown) and is rotated by means of a toothed drive wheel l3. The drive wheel I3 is rotated continuously so long as the printer is in operation by means of a chain l4 operably connected to a similar Wheel (not shown) on the main drive shaft of the printer. The drive wheel 3 is operably connected to the platen shaft l2 through the usual friction clutch l6 of any well known type.

The rotation of the platen II is controlled by an escapement mechanism I! which cooperates with a ratchet |8 fast to the platen shaft 2. The escapement mechanism consists of an upper pawl |9 and a lower pawl 2| each of which is secured pivotally to a shaft 22. The upper pawl |9 has a shoulder 23 and the lower pawl 2| has a shoulder 24 both of which are cooperable to limit the movement of the pawls I9 and 2| towards one another in response to the urging of a spring 26 secured suitably to both of the pawls l9 and 2| When a line feed signal is received by the printer a line feed function bar 27 is selected and moved upwardly at which time it engages and lifts a line feed push bar 28 into engagement with a function ball 29. The function bail 29 operates invariably, moving to the left (Fig. 2) and, in so doing, engages a shoulder 3| on the line feed push bar 28 and moves the push bar 28 to the left. The line feed push bar 28 is secured pivotally to a bell crank 32 by a bolt 33 and pivots the bell crank 32 about its pivot shaft 34 during the leftward movement of the push bar 28. The bell crank 32 is secured pivotally to a line feed Ver itcal link 36 by means of a bolt 31 and the vertical link 36 is in turn secured pivotally to the lower pawl 2| by means of a bolt 38. Thus the move? ment to the left of the line feed push bar 28 is translated into a counterclockwise movement of the lower escapement pawl 2|.

When the lower escapement pawl 2| is pivoted counterclockwise in response to a line feed Signal the shoulder 24 thereon, being in engagement with the shoulder 23 of the upper pawl I9, also causes the upper pawl l9 to be pivoted counterclockwise. Thus the ratchet I8 is advanced a step in response to a line feed signal in the following manner. Both pawls l9 and 2| move upwardly relative to the ratchet I8 and when the upper pawl l9 disengages the ratchet I8 the lower pawl 2| is moved to a position midway between two teeth of the ratchet 18. Thus the platen H is rotated counterclockwise a half step by the clutch [6 until the pawl 2| engages a tooth on the ratchet. Thereafter as the bail 29 moves back to the right a spring (not shown) causes the lower pawl H to be moved clockwise to its normal position. A spring 39"connecting the two pawls l9 and 2| is effective at this time to pivot the upper pawl I9 clockwise, thereby retaining both pawls engaged at their shoulders 23 and 24. When the pawl 2l moves from engagement with the ratchet [8 the pawl l9 moves toa position midway between two adjacent teeth onthe ratchet 58. "Thus the clutch I6 is again effective to cause the platen H to be moved a half'step whereupon the pawl [9 again engages a tooth on the ratchet 18. It is therefore apparent that upon the receipt of a line feed signal the platen I I is moved a total of one full step counterclockwise which is equivalent to a single line feed.

The vertical tabulation and form feed out mechanisms will ,now'be described. A freely rotatable auxiliary shaft 4| is mounted suitably in the printer frame and a stop Wheel 42 is fixed to and rotatable with this shaft. The-stop wheel 42 is provided with a plurality of radial slots 43 spaced uniformly around the'periphery thereof. A stop is provided foreach one of the slots 43 and is slidable therein with the exception of the stop in the No. 66 .position of the dial, as shown. The stop -44--in the No. 66 position is wider than the other stops 44 andispermanently positioned so as to extend vinto feed out position and vertical tabulation position at'alltimes to insure proper operation of the mechanism under all conditions of operation. Each of the stops 44, from zero to No. 65 position is provided with three notches 46, 41, and 48. A garter spring 49 is positioned within slots around the stop wheel 42 for the purpose of retaining thestops 44 within the slots 43. Normally the garter spring '49 is lodged in the middle notch 47 0f the stops 44 so as'to retain the stops an ineffective position. When one of the stops-44 is moved to the right, or to its tabulation position, as shown in Fig. 4, the garter spring becomes lodged in the notch 48 of that stop and thus retains the stop in tabulation position. Similarly when one of the stops 44 is moved to the left, or form feed out position, the garter spring 49 becomes lodged in the notch 48 and retains the stop in form feed out position. The garter spring 49 and the notches 46, 41, and 48 in each of the stops 44 provide a convenient means for retaining the stops 44in the slots 43, and further render it easy to change the settings of the stops manually. When it is desired to set one of the stops 44 in either its tabulation or form feed out position such stop is merely moved longitudinally in its slot 43 until the garter spring 49 rides over the bump between "the notches and becomes'lodged in the next adjacent notch. The stop wheel 42 may be marked by numbers such as is shown in Fig. 2 in order escapementlatch I 9.

4 to facilitate the manual operation of setting the stops 44.

A form feed out latch 52 and a vertical tabulation latch 53 are mounted pivotally on a shaft 54 which is mounted suitably in the printer frame. The feed out latch 52 has a cam surface 56 for cooperating with a stop 44 which has been set previously in its leftward or form feed out position and the tabulation latch has a cam surface 51 for cooperating with those stops which have been set previously in their rightward or tabulation positions. The latches 52 and 53 respectively havecam surfaces 58 and 59 and locking surfaces BI and 62, all of which cooperate with a bent over portion 63 on the end of the The latches 52 and 53 respectively have cooperating bell cranks 64 and 66, each of which are spring biased in a clockwise direction by springs 81, about their respective' pivot shaftsBB'aIid' 69. A form feed out vertical linkll, which'is rendered operable in response to a form feed out signal-by a function mechanism similar to the line feed function mechanism, has a shoulder 12 for cooperatin with the lower'arm of the upper escapement pawl'l9, and carries'an arm 13 which cooperates with the bell crank 64. A vertical tabulation link'14, similar to the form feed out vertical link H and operable in response'to' a vertical tabulation signal, also has'a shoulder 16 for cooperating withjthe upper escapement pawl l9 and carries an arm Hwhich cooperates with thebell crank 66.

A line feed cam'wheel I8 is secured fixedly to the platen shaft l2 and rotates in unison with the platen II. A bell crank '19 is mounted pivotally on a suitable shaft 8| and has a follower portion'82'which'follows the'surface of the line feed cam wheel 18. The bell crank 19 is secured pivotally to a feed 'pawl83iby means of a bolt 84. The jfeed pawl 83'is'continuously urgedtowards. a ratchet wheel 86 mounted fixedly on the shaft4l by means of a weak spring 81, the bell crank being urged continuously counterclockwise about the shaft 8| by'means of a suitable spring'88. "A holding pawl 89'mounted pivotally on a shaft SI and spring biased clockwise by a spring 92, also cooperates with the ratchet 86. The ratchet i86:is normally urged in a counterclockwise direction by a helical spring 93 suitably secured'to the ratchet 86 at one end and to a stationary member 94 at its other end. With each line feed operation or with each step of the platen H, the line feed cam wheel 18 oscillates the follower bell crank 19 which in turn oscillates the feed pawl 83. 'When the feed pawl 83 .moves to the right it advances the ratchet 86 untilithe holdingpawl 89.engages the next successive tooth and'by this time the follower 82 will-have passed the peakof one ofthe cams on-thecam wheel vI8 sothat during the last half of the step of theplaten II the feed pawl 83 returnsto the leftand slides over the next adjacent tooth.

It is assumedthat one of the stops 44 has been moved to its right hand position (Fig. 1 or 4) or tabulation position. A vertical tabulation signal causes a vertical tabulation function bar (not shown) similar to the line feed function bar 21 to raise which results in the momentary downward movement of the vertical tabulation've'rtical link 14. When the verti'callink14'moves inthis manner the shoulder l5 pivots'the upper escapement pawl 19 counterclockwise from engagement with the ratchet I8 and the arm 11 pivots the bell-crank 66 counterclockwise about the pivot shaft 69 against the action of its spring 61 until the vertical tabulation latch 53 is free to move counterclockwise under the urging of its spring 96. When the shoulder 16 moves the upper pawl I9 the platen I I is released for continuous rotation for the reason that the lower pawl 21 remains disengaged from the ratchet I8 due to the fact that the line feed vertical link 36, being stationary, prevents the spring 26 from being efiective to pull the lower pawl 2| up-with the upper pawl I9. Upon the release of the vertical tabulation latch 53 by the bell crank 66, the bent over portion 63 on the upper pawl I9 becomes latched by the locking surface 62 on thetabulation latch 53. Thus the platen II continues to rotate until the bent over portion 63 becomes'unlatched. When the tabulation latch 53 is pivoted counterclockwise in this manner the cam surface 51 is moved downwardly sufliciently to be in a position to be engaged by the stop 44 in vertical tabulation position.

As the platen II rotates in response to the vertical tabulation signals the stop wheel 42, being mounted on the shaft M with the ratchet 86, also rotates until the stop 44 in tabulation position engages the cam surface 51. The stop 44, upon engaging the cam surface 51 is effective to cam the tabulation latch 53 slightly clockwise so as to unlatch the bent over portion 63 of the upper pawl I9 from the locking surface 62. The spring 26 is then effective to pull the upper pawl I9 downwards, at which time the bent over portion 63 cooperates with the cam surface 58 to cam the tabulation latch 53 still further clockwise until it overrides the top of the vertical arm of the bell crank 66. The spring 61 on the bell crank 66 is then effective to pivot the bell crank 66 clockwise until it strikes a stop bolt 91. When the upper pawl I9 is pulled downwards by the spring 26 the rotation of the platen II is stopped.

When a form feed out signal is received the form feed out vertical link II is pulled downwardly in the same manner as the vertical tab-ulation vertical link 14 or the line feed vertical link 36 is pulled downwardly in response to a vertical tabulation or line feed Signal. When the feed out vertical link H moves downwardly the shoulder I2 pivots the upper pawl I9 counterclockwise to enable the rotation of the platen II and the arm I3 pivots the bell crank 64 counterclockwise until the form feed out latch 52 is free to move counterclockwise under the urging of its spring 98 and it becomes latched at its locking surface M by the bent over portion 63 of the upper pawl I9. As the platen II rotates the stop wheel 42 also rotates until the stop 44 in form feed out position or, in case there is no stop 44 in such position, the stop 44 in No. 66 position strikes the cam surface 56 on the feed out latch 52. The feed out latch 52 is thus pivoted to its normal position and the rotation of the platen II is stopped in the same manner as in the case of a vertical tabulation signal being received.

At the same time the stop 44 in feed out position strikes the cam surface 56 it also strikes a cam surface 99 on an arm IOI projecting from the feed pawl 83. The stop 44 cooperates with the cam surface 99 to cam the feed pawl 83 upwardly until it becomes disengaged from the the teeth of the ratchet B6.- Upon raising, due to the action of the'stop 44 and ca'm surface 99, the feed pawl 83 engages a projection I02 on the holding pawl 89 and moves the holding pawl 89 out of engagement with the ratchet 86. When the feed pawl 83 and holding pawl 89- are disengaged from the ratchet 86 a lug I03 is raised sufiiciently to permit the vertical arm of. a bell crank I04 to be pivoted beneath the lug I03 by a spring I06. The bell crank I04 thus retains the feed pawl 83 and holding pawl89 in disengaged relation to the ratchet 86. Under this condition the spring 93 is free to unwind and does so, thereby rotating the ratchet 86 and stop wheel 42 counterclockwise. The ratchet 86 and stop wheel 42 continue rotating counterclockwise until a stop pin I01 on the ratchet 86 strokes a camming portion I08 on the horizontal arm of the bell crank I04, whereupon the-bell crank I04 is pivoted counterclockwise against the actionof-its spring I06 and to a. position disengaged from the lug I63. The feed pawl 83 and holding pawl 89 again engage the ratchet 86 and thestop wheel 42 occupies its zero po,' sition. v

When a telegraph printer is equipped with the present invention the printing of forms of uniform length is very greatly facilitated. Thepresent invention makes it possible to print and automatically feed out forms of any length up to the length of a single line feed multiplied by the number of stops 44 on the stop wheel 42. In the present disclosure only sixty-six stops are shown on the stop wheel but obviously increasing the number of stops and similarly increasing the number of teeth on the ratchet 86 would make it possible to increase the length of the forms which could be handled. The vertical tabulation feature Of the invention makes it possible to ad,- vance the platen from any line position on the form to the next stop position as determined by the settings of .the stops 44 in response to a single signal. I,

The various parts of the invention are so arranged as to insure proper operation thereof at all times, even in the case when it is not desired to utilize the form feed out and vertical tabulation features. When these features are not being used, each time the permanent stop 44 (the stop 44 occupying the No. 66 position on the stop wheel) advances to engage the cam surface 99 on the feed pawl 83, the pawls 83 and 89 are disengaged from the ratchet 86, and consequently the spring 93 is able to return the ratchet 86 and stop wheel 42 to their zero positions. Also, when operating under these conditions if an operator accidentally sends a form feed out signal or a vertical tabulation signal the platen I I will rotate until the stop 44 in No. 66v position engages either the cam surface 56 or 51 depending on which signal was accidentally transmitted. Thereafter the platen is stopped in the manner already described. H

I Obviously numerous changes may be made in the invention without departing from the spirit or scope thereof. 7

What is claimed is:

1. In a device for facilitating the printing of forms of uniform length, a platen, means for rotating said platen to advance forms therearound, means for holding said platen against rotation, means operable in response to a line feed signal to release said holding means to advance said platen a step to bring the next successive line on-the form into printing position, a selective stop meansfor controllingsaid holding means, means responsive, to a verticaltabulating 7: signalrtoire'leasesaid-holding means to cause said platennrotating means .to advance said platen to alapredetermined position as determined bythe selective setting-of the stop means to thereby bring a line on the form other than the next successive line into printing position, and means responsive to aform feed out signal to release saidiholding meansto advance said platen. to a. predetermined :position as determined by the selective setting of .the stop means to thereby bring :thenext succeeding form into printing position. 7

:2; In a devicefor enabling vertical tabulation ofiforms througha signal controlled printer, the combination of a platen, means for rotating said platen,:an escapement mechanism for controlling the rotation of; said platen by said platen rotating means, a signalresponsive line feed mechanism cooperating with said escapement mechanism for causing a line to line advancement of said platen by :said platen rotating means, a stop wheel rotatable with said platen,: a plurality of settable stops on said stop wheel, each of said stops being movable to a'vertical :tabulatingpositiomand a signal responsive mechanism cooperating with said escapement mechanism and with said :stop wheel :to :causeadvancement of -,said1-platen until the :next successive stop in vertical tabulating position engages said last 'mentioned signal responsive mechanism.

"3. In: combination with a-telegraph' printer of the pagetype having a-;rotatable platen, means continuously operative tending to rotate the plateniand feedaform therearound, an escapement mechanism :for controlling the rotation of said platen andform, a stop wheel rotatable with said platen, a-stop'onsaid .stop wheel for each line feed position' on said form, each of saidstopsbeing-settable: to a vertical tabulatingposition, and

a-signal responsive mechanism cooperable with said stops in vertical tabulating position andmvith said-escapement mechanism to enable vertical tabulation of said form to positions determined bythe vertical tabulating settings of said stops.

4. In combination with a telegraphrprinter of the-page type having a rotatable platen, means for"rotating the platen to feedaform therearound, I an escapement .mechanism ,for controlling the rotationofsaid platen and'form, arstop wheel, a stopon said stop wheel for .eachline position on sai'd.fo1'm,:each ofsaidstopsbeing settable-in a vertical tabulating position, cam actuated'pawlv1and.ratchet means for rotating saidstop wheel' as said platen rotates, a signal responsive mechanism 'for actuating said escapementmech'anismto cause rotation of =said;platen, a member movable by .said signal responsive mechanism intothe path of rotation of -said stops set. in vertical-tabulating; position, said stop wheel continuing rotation until one of said stops ,in vertical tabulating position engages said member, said member being effective upon engagement with said one of said stops to cause said-escapement member to stop the rotationnoiwsaidwplaten whereby said form is stopped in accordance with the setting of said one of said stops in vertical tabulating position.

5. Incombination with a-telegraph printerl-of the page type havinga .rotatableplaten, means forrotating the platen to feed forms therearound, an escapement mechanism for controlling the rotation of said platen and forms a stop wheel rotatable with said platen, a stop on said stop wheel for each line-feed position'on' a form, each of said stops being settable from normal :to-a

verticaltabulating:position or to atom feed out position;v a signal responsive mechanism cooperable with :said stopsin vertical tabulating-position :and with-said escapement mechanism to enable ivertical tabulation of said "form to positions determined by the vertical tabulating -settin'gsof; said stops, and another signal responsive mechanism cooperable with a stop in formfeed out position and with said escapement mechanism: to enable-feed out of said form, wherebyia new form -is positioned in printing position.

-:6.-In a form feeding device for telegraph printers, --a rotatable platen, means for rotating said platen to advance-forms therearound, means for holding the'platen against rotation, signal responsive means for'releasing the holding means for enabling the step by step advancement of said platenby-said-rotating means to bring successivelines of a form into printing position, a settable stop "mechanism for predeterminedly selecting-aplurality of intermediate stop positions of said platen and a form feed out stop position of said platen, means responsive to a special signal for releasing the holding means for enabling said platen rotating means to advance said platen and said form to the next successive predeterminedly selected intermediate stop position, and means responsive to a different special signal for enabling saidplaten rotating means to advance said platen and. said form to said predeterminedly selected form feed out stop position,

' whereby-said form is fed out and a new form is positioned in printing position.

7. In a 'form feeding device for telegraph printers, arotatable platen, means for rotating said platen to advance forms therearound, means for holding .the platen against rotation, signal responsive means for releasing said holding means-for enabling step by step advancement oi said platen-bysaidrotating means to bring successiveilines of a form into printing position, a settable-stop mechanism, a plurality of settable stops in said stop mechanism positionable in a mannerfor'predeterminedly selecting a plurality of intermediatestop positions of said platen and a form feed out stop position of said platen, means responsive to a special signal for releasing said holding means for enabling said platen rotatingmeans to advance said platen andsaid form 'to the vnext successive predeterminedly selected intermediate stop position, and means responsive to a different special signal for releasing said holding means for enabling said platen rotating means to advance said platen and said form to-saidpredeterminedly selected form feed out-stop position, whereby said form is fed out and-anewform, is positioned in printing position.

:-8. In aform feeding device for telegraph printers, agrotatable platen, means for rotating said platen ;to-;advance forms therearound, signal responsive means for enabling step by step advancement of'said platenby said rotating means to :bringsuccessive-lines of a form into printing position,-;a settable stop mechanism rotatable withsaid platen, aplurality of settable stops in saidstop mechanism positionable selectively in vertical tabulating positionor form feed out position,.a .first means normally ineffective for engaging a stop positioned in vertical tabulating position,'-a second means normally ineffective for engagingza stop inform feed out position, means responsive to a special signal for enabling said platen rotatingmeans to advance said platen and said .form and for rendering said first means eflective,:-said stop mechanismzrotating with said platen untilengagement' of said first means with the next successive stop selectively positioned in vertical tabulating position, said first means thereby being rendered effective to cause said platen to stop rotating, and means responsive to a different special signal for enabling said platen with a stop in form feed out position, said sec- .ond meansfthereby'bein'g rendered effective to cause saidplatento' "stop rotating, whereby said 'form' has been fed out and a new form positioned in printing position.

9. In a form feeding device for telegraph printers, a platen, means for rotating said platen to advance forms therearound, a signal responsive mechanism for causing line to line advancement of a form around said platen by said platen rotating means, a signal responsive mechanism for initiating vertical tabulating advancement of said form around said platen by said platen rotating means, a signal responsive mechanism for initiating form feed out advancement of said form around said platen by said platen rotating means, a settable stop mechanism rotatable from a zero position with said platen for predeterminedly controlling vertical tabulating and form feed out advancements of said form by said platen rotating means and for adding all line to line and vertical tabulating advancements of said form by said platen rotating means, whereby said platen is rotated to a predetermined point by said platen rotating means as determined by said settable stop mechanism upon initiation of a form feed out advancement thereby feeding out said form and positioning a new form around said platen, and means operable upon completion of a form feed out advancement of said platen for returning said settable stop mechanism to said zero position, whereby said settable stop mechanism is thereby rendered effective for controlline vertical tabulatin and form feed advancements of said new form.

10. In an a aratus for feeding forms out of a tele ra h printer, a platen adapted to carry a form therewith, means for advancing said platen, a member for holding said platen against advancement, a stop mechanism connected to said platen, a plurality of settable stops in said mechanism wherein a stop may be set according to the length of form to be fed by the platen, and a linkage unit connected to said holding member whereby actuation of the linkage unit by the reception of a s ecial signal releases said holding member and simultaneously positions said linka e unit in position to be en aged by theadvance of said sto said linkage unit being adapted to move the holding means into engagement with the platen upon the stop striking the linkage unit.

11. In an apparatus as defined in claim 10 which includes means to be engaged by the settable stop to return the stop mechanism to its initial position upon completion of the form feed out operation.

12. In a signal controlled form feeding apparatus for use in a telegraph printer, a platen for carrying a form therewith, means to advance the platen in accordance with predetermined signals, said means including drive means eng g said platen, means for normally holding the platen against advancement by the drive means, a plurality of linkage devices for controlling the holdingmeans in'accordance with the reception of a signal in any particular devices, an actuator operatively connected to the platen for movement therewith, settable means on the actuator for engaging one or morej of the. linkage devices, whereby-selective actuation of'any of the devices causes said platen to rotate said actuator toibring one of the settable means into engagement with the selected. device to-cause the holding means'to engage the platen to stop the advancement of the platen. e 13. In a'printing telegraph machine, a platen adapted to'be moved'and carrya form therewith, continual driving meansfrictionally engaged to said platen, means for-restraining the movement of the platen against the frictional driving means, means responsive to a line feed signal for releasing the restraining means to permit the platen to advance one increment, a stop mechanism settable in a number of predetermined positions, means interconnecting the stop mechanism with the platen whereby movement of the platen is imparted to stop mechanism, latching means adapted to be positioned in the path of movement of the stop mechanism, and means operated by reception of another signal for releasing said restraining means, engaging the restraining means with the latching means and moving the latching means into position to be engaged by the advance of the stop mechanism.

14. In a mechanism for advancing a platen in a telegraph printer, driving means for the platen, frictional means connecting the platen to the driving means, means for engaging the platen to normally overcome the frictional means to prevent the platen from advancing, a pair of operating members for controlling the position of the engaging means, said operating members being formed to provide a latch for said engaging means, a stop carrier operatively connected to and moved by advancement of the platen, a plurality of stops settable to predetermined positions in the stop carrier, means responsive to a tabulation signal to move the en aging means from the platen and move one of the operating members into position to be en aged by a set stop. whereby the engaging means is latched in position, said platen and sto carrier advancing until the set stop en ages the operating member whereby the operating member unlatches the engaging means to engage the platen to stop the advancement, and means responsive to another signal to move the engaging means from the platen and move the other of said operating members into a position to be engaged by a second one of said stops whereby the engaging means is latched in position, said platen and stop carrier advancing until the second stop en ages the operating member whereby the operating member unlatches the en a in means to en a e the platen to stop the advancement of the platen.

15. In an a paratus for advancing a form in a printing telegraph machine, a rotatable platen adapted to carry a form therewith, drive means frictionally connected to the platen, a first ratchet connected to said platen, an escapement means normally engaging said first ratchet to prevent rotation of the platen, means responsive to a line feed signal for moving the escapement means sufiiciently to allow the first ratchet to advance one increment, a cam connected to said platen, said cam having a plurality of lobes thereon equal in number to the teeth on the first ratchet, a second ratchet, a pawl means interconnecting said second ratchet and lobed cam, a stop wheelconnectedto'seld secondqatchet; a,:.p1ura1 ity of selectable stops onthe stop wheel; means $0 hold a' selectedstopin a set position; a,--pivot'a1ly mounted -be1l crank having: a= notch on one end adapted to engage and hold the escapement means out of engagementmith the firstratchet,

and meansresponsiveto= ar'form feed signal to movetheescapement means out-- of engagement with the first 'ratchet;'--move the bell crank:-to latchthe escapement: m position andmove zth'e bell crank into a position to be engaged'lby a selected stoponthe stop: wheeli whereby the rotation:- of-'the platen is: imparted" to the= cam whichmoves: the:pawl to advance: 'the- I second ratchet and 'th'e:stop wheel to :bringithe stop into engagement with" th'ei bell crank: sothat the 1-2 escapement means :is -unlatchedifnzstop--the rotattlon or the tzplatem EDwARUTf-BALDWIN;

:REFEBENCESQCHED' A The following references: are v of record inthe file; of-this' patenta:-

' UNITED; STATES'T'PATENTS? Number Name: Date;

22731181 'zenner" -;Feb.17', 1942 2376391 Longet a1. Mar.17; 1942 "213491674 Potts" Ma3i2311944 '2;529;238 Angel Nov: 7, 1950 2,536,528 Baldwin Jan: 2; 1951

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