US1401950A - Printing telegraph - Google Patents

Description

A. H. ADAMS. PRINTING TELEGRAPH.

APPLICATION FILED OCT. 29, 1918.

Pafented an. 3, 1922.

3 SHEETS-SHEET I.

A. H. ADAMS.

PRINTING TELEGRAPH. APPLICATION FILED ocT. 29, I9I8.

Patented Jan, 3, 1922..

3 SHEETS-SHEET 2.

A. H. ADAMS.

PRINTING TELEGRAPH. APPLICATION FILED oc T. 29, 191s.

1,40 l ,950.7 Patented J an. 3, 1922..

3 SHEETS-SHEET 3.

//1 Ven/0?. /l //u//f H. Ada/775.

UNITED STATES PATENT oFFlcE.

ARTHUR E.' ADAMS, 0F SPARKILL, NEW YORK, ASSIGNOR' T0 WESTERN ELECTRIC COIPANY, INCORPORATED, 0F NEW YORK,y N. Y., A. \COBPOBATION OF NE YQRI.

:PRINTING- TELEGRAPH.

Specification of Letters Patent.

Patented Jan. 3, 1922.

To aZZAwwm t 'may concern:

Be it known thatiI, ARTHUR H. ADAMS, a* citizen of the United States,residin at Sparkill, in the county of Rockland, tate of New York, have invented certain new and useful Improvements in Printing Telegraphs, of which the following is a full, clear, concise, and exact description.

yThis, invention relates to printing telegraphs andvparticularly to improvements in printing apparatus employed at receiving stations.

Some of the principal objects of this invention are to provide manually operable means-for eecting return of the .type carriage; carriage returnimechanism combined with line feed and ribbon feed mechanism; etc.

- To the above ends means are provided for distributing a series of current impulses to a plurality of selecting angd operation-controlling magnets, which magnets control the Selection of the desired character to be printed and operation to be performed. The invention is disclosed in the accompanying drawings as applied to a telegraph receiving printer comprising stationary selecting mechanism, a stationary paper platen and printing elements adapted' t0 be moved transversely of the printer. The printing mechanism disclosed is'of standard typewriter construction and is applicable to any suitable type bar typewriting. machine.

Various auxiliary functions, such, for example, as line feed and ribbon feed, carriage return, line feed and ribbon feed, character and word spacing, shift and unshift, etc., are controlled by a plurality of special code bars selectively controlled by line current impulses. The various auxiliary operations of the printer are performed by a batter of rotatingcams cooperating with suitable bell g crank levers or operative members to'yefect the desired operation. The /cam members are mounted on a rotatable shaft to which power may be applied by means of a motor or anysuitable driving mechanism.

The selecting mechanism disclosed. consists ofa plurality of stationary' selecting magnets and a corresponding number of -horizontal selecting bars' controlled by said magnets. The selecting bars extend entirely across the printer and are adapted to be raisedand lowered but are not capable of endwise movement. 'i

A plurality of notched code bars orpermutationbarsI are provided and the arrangement of these bars, with respect to the'selecting bars, is such that when any combination is set up by the selecting magnets, only one of the code bars will be permitted to move forward and mesh with the selecting bars. Each of the code bars whichsfcontrols the printing of characters, cooperates with a pull bar which is adapted to be moved forward by the code bar when selected into the path of a reciprocating printing bar which printing bar is controlledby the rotating cam shaft. VVhcIa pull .bar is moved forward and engaged by the printing bar, a type face carried by the correspondlngtype lever is thrust against the paper platen and the selected character printed.

The above and other objects of this invention will be fully set forth in the following description and claims and will be more readily understood byreference to the accompanying drawings, in which Fig. 1 is a perspective view of the printing and selecting mechanism as assembled with certain parts broken away to simplify the drawing and to more clearly show the cooperation between the -various stationary and movable parts; Fig. 2 is a vertical sectional View of the mechanism disclosed in Fig. 1, together with paper feeding and paper guiding mechanism, etc., Fig. 3 is a front elevation of the paper platen, paper guidin mechanism` and paper holder disclosed 'in gFig. 2; Fig. 4 is a detail view of the automatic. paper travel correcting mechanism; Fig. 5` is a view showing a iexible metallic spring for causing the -printing medium to conform to the periphery of the platen; and Fig. 6 is a view ofl an adjustable paper tearing edge.

The mechanism herein disclosed is operated preferably by a fye-unit code with an additional impulsel following each group of selecting impulses for starting the mechanism in operation. The selecting impulses 100 may consist of current of diife'ent polarity, different strength or the impulses may be formed by simply opening and closing the line circuit as in orse operation. The impulses may arrive over a 'line from a distant 105 station and may be distributed to the selecting and starting magnets by means of a Baudot distributor or any of the well-known distributor systems. i

. In order to simplify the drawings, the 110 driving mechanism and a considerable portion of theA frame structure have been omitted. f Also various springs which would normally be used for restoring various operation arts to normal have been omitted to avoi complicating the drawings. It is to be understood, however, that suitable supporting means may be 'provided for the` Vis thought to be unnecessary to enter into a detailed description of the mechanism herein disclosed, except in so far as such description is essential to a clear understanding of the new and novel features.

Referring to the drawings, and particularly to Fig.l 1, the type carriage illustrated is of a form so well known as to require no detailed description. The type carriage 5 carries ,type bars, connecting links, code bars, etc., and is supported bya portion of the Jrame 6r and rotatable shaft 7.

The selecting' mechanism consistsv of five selecting magnets and live corres onding selecting bars 8, 9, 10', 11 and 12. nly two of the selectngmagnets, 13 and 14, are shown. The yselecting bars 8 to 12 inclusive extend entirely across the printer at right angles.

to the character code bars 15 and the special code bars 16, 17,1819, 20 and 21. Each of the selecting magnets is providedwith an armature 22, 23', 24, 25 and 26, and extending from the armatures of the selecting magnets to the selecting bars are tive latches, 27, 28, 29,730 andV 31.` The latches normally extend beneath the selecting bars and are adaptedtobe withdrawn when the selecting magnets are energized for selecting. purposes. The selecting bars are normally held `in -the positions shown by 'means of the disclosed is the same as lthat disclosed in a y notchedl member 32:,- and when released and permitted to drop they are held in their lower positions by means of springs 33 until restored byv the upward movement ofthe member 32 in which position they are again held by the member 32 until a new selection set up. The selecting mechanism herein co-pending application of 'Harry'Pfannenstiehl and Erwin QP. Bancroft, Serial No.

195,712, filed October 10, 1917 ,and therefore further detailed description of the selecting mechanism is unnecessary.

As hereinbefore mentioned, the code bars are arranged so that when a selection is received, one'and only one, of the code bars vwill be permittedV to move forward astride the selecting bars. The code bars 15 are normally held in the .y position shown by means'of a universal .bar 34, which extends entirely across the type carriage in front .of the extensions 35 carried by the bars 15. The universal bar 34 and printer bar 38 are moved, out of their normal positions by` means of a striker bar 39, whlch is forced p downwardly by the action ofcams 40, 40, on cam shaft 41. The striker bar 39 is carried by two'bracket arms 42 and 43 which Vare pivotally secured to a supporting rod- 44. The rod 44 may be journaled in the sides of the printer frame or may be supported in any suitable manner. The bar 39 is normally held in the position shownby spring members 45, one end of'which spring is connected -to an extension of the bracket. arms /42 and 43, while the other end of the spring is connected to an arm 115 of the eccentric of cam 40.' On-'each of the bracket arms 42,

and 43 is secured an adjustable member 46, one of which is clearly'shown in Fig. 2. On the supporting rod.44 and adjacent each of the bracket arms 42 and 43 is, pivotally mounted an arm 47 which arms are oscillated by the cam 40. Each of the arms 47 carries a member 48, which is normally held inl engagement with its corresponding adjustable member 46 by a spring 49, and may be held away from the .members 46 for certain purpos as will presently appearl It will be .seen by reference, particularly to Figs. 1 and 2,.that when the cam 40 moves the arm llforward the striker bar 39 will be forced downward and by `acting on the 'extensions'50 and 51' of crank lever 52 and into the path of the reciprocating printing bar 38, so that on its downward stroke the printing bar strikes the end of the selected pull bar, thereby thrusting the desired typey .against the paper platen in a well-known manner.

Movement of the type carriage from left to right across the printer for character and word vspacing is effected by the cam shaft and the type carriage is moved forward one step or one character space immediately after each` character is printed. A pivotally mounted rod 55 is provided which may be journaled in the frame of the printer or supported in anysuitable manner. Rigidly secured to the rod 55 are two bracket arms 56 '(only one of which is clearly shown) which carry the rack 57. Coperating with the rack 57 and keyed to the rotatable shaft 7 is a worm Wheel 58. On one end of the shaft 7 is a ratchet wheel 59, which is adapted to be rotated by an operating pawl 60. The pawl 60 is controlled by operating levers 61 and 62 and cam surface .63. The rotation of the ratchet 59 effects rotation of the shaft 7, and by means of the worm wheel 58 mounted thereon, the type carriage 5 is moved to the right one step or one character space for each group of character impulses, or whenever a spacing combination is transmitted.

It is necessary that means be provided to prevent spacing of the type carriage when certain auxiliary functions, such as line spacing, carriage shift, etc., are being performed. This is taken care of by providing some of the auxiliary code bars with an upwardly extending arm which is adapted to engage a bail 64 and move an upwardly extending arm 3 into the path of a reciprocating arm 65 carried by the rotatable shaft 7. Whenever the arm 65 is held against rotation the cam surface 66 carried thereby prevents the operating pawl 60 from engaging the teeth of the ratchet wheel 59, so that movement of the type carriage is prevented.

At the left-hand side of Fig. 1 is shown a plurality of special code bars 16 to 21 inelusive which are similar to the code bars 15 mounted on the movable type carriage 5. The special code bars are for the purpose of controlling the various mechanical operations such, for example, as linefeed and ribbon feed, carriage return. line feed and ribbon feed, shift and unshift, etc. Code bars 16 to 2-1 inclusive are adapted to slide in recesses rovided in the stationary supports 67 an are selectively controlled by line current impulses in the same manner as the character code bars, 15; that is, the various mechanical functions are selectively controlled by code signals which are transmitted in the same manner, and by the same means as the various character signals, also the power for performing the various mechanical functions, except line feed and ribbon feed, is supplied by the rotary cam shaft.

By reason of the fact that the paper platen is stationary and the type carriage movable, there is provided no common printing point. Consequently, it is not necessary to feed the inking ribbon as often or as frequently as if all characters were printed at a common point. Therefore applicant has provided means whereby the ribbon mechanism may be operated at the end of each line or whenever the platen is rotated to feed the printing medium forward for line spacing. For this purpose a special magnet 68 is provided for operating the line feed and ribbon feed mechanisms selected is moved forward and engages connecting link 69, which is likewlse moved forward. The rear end of the connecting link 69 is connected to a rocker arm 70 which is pivoted at 71. The opposite ,end of the rocker arm 70 is normally held against a member 72 by means of spring member 73, which tends to hold the rocker arm 70 in the position shown. Spring contacts 74 which control the circuit of the magnet 68 are normally open but are. adapted to be closed by the rocker arm 70 when the special code bar 20 is selected. When the arm 70 is rocked to close contacts 74, member 72 is forced upwards and engages the off-set portion 75 of the arm 70. and holds the arm 70 `in its actuated position, thereby retaining contacts. 74- closed until the magnet 68 has completed its. operation.

Magnet 68 is provided with a plunger or core` 76 which controls the. movements of arms 77 and 78. The arm 78 is pivoted at 79 and the arm 77 carried by arm 80 is likewise pivoted at 79. Arms 77 and 78 are operated simultaneously, the former controlling the operation of the ribbon feeding mechanism and the latter controlling the operation of the line feeding mechanism. The ribbon mechanism is shown in Fig. 2 comprisin a ribbon spool 81 supported by a rotatab e shaft V82 which is supported in any suitable manner. On the end. of the shaft 82 is a inion or bevel gear 83. Mounted at right angles to the shaft 82is a rotatable shaft 84 which also carries a bevel gear adapted to mesh with gear 83.

Rigidly secured tothe shaft 84is a ratchet 85. Loosely mounted on the shaft 84 is an arm 86 carrying a pin 87 and av pawl 88 which is adapted'to engage the teeth of the ratchet wheel 85. The arm 77 when actuated engages the pin 87 carried by arm `86 and thereby effects rotation of the ratchet 85 by means of the pawl 88. Rotation of thematchet 85 imparts rotationto the ribbon spool 81 and thereby advances the ribbon a predetermined amount. The ratchet 85 is also provided'with a holding pawl 89 tov urpose of rotating the paper.

actuation'of the magnet 68. By movement of the lever 93 and pin 94, the holding pawl may be caused to rotate the platen the eX- tent of one, or more teeth. The slidable about its l`pivotal point 79. Thus it will be seen that whenever magnet 68 is energized the paper platen and the ribbonA spool will be rotated simultaneously, thereby control'- ling the spacing between lines and the advancing of the inking ribbron in one operation.A v

Type ,caw-age fret/L4M, feed ami ribbon v fee The combined operation of ribbon feed and' line feed has just been described.A

' vWhen it is desired to commence a new line,

it is invariably desirable to return the type carriage to the left-handmargin of the printing mediu'm'. By means hereinafter described the operations of line feed, ribbon feed and carriage return, maybe effected simultaneously and by one group of signalingimpulses. 'These'. operations may be'laccomplished by sending over the line a group of impulses to cause the'selection of the-special code bar 21, and release of the cam shaft 41. When the cam shaft is released and starts rotating, a caml 96 acting upon bell crank lever 97, will force the auX- iliary striker bar 98 (which bar vcorresponds to the main striker bar 39) i,down against the action of suitable springs (notV shown). The bar 98. acting upon belll crank'levers 99 and 100 movesfj the auxiliary universal bar 101 (which bar corresponds to the main universal bar 34)- forward and permits the selected'- special code bar 21- to move forward: astride the selecting bars 8 to 12'in-4 elusive. ,As the. bar2'1gmoves forwardun` der the action of-suitable springs, it perforns1 two .function's; first'yit moves a pull bar 102 forward into the pathof (a Ireciprocating member 103 carried by the'bell crank lever 104, which is operated by a cam 105 on the cam shafti 41; Aand secondly, by means of a pin 106 carried thereby, the con-4 necting link 69 is 'engaged and moved-,for- -wardto operate the rocker arm 70 and close thecircuit contacts 74 which establish an energizing circuit for the line feed and ribbon ,feedmagnet`68. The pull bar 102 is the locking connected to the rack 57 and when the 'rack is pulled down by thefactionof the pull bar the rack is disconnected from the. worm wheel 58Qand is temporarily locked down by disc member 107 carried bythe shaft 7. he member 107 is normallyheld against therack 57 by a'fspring108as 'shown in Fig. '1, and when the rack is depressed the locking member 107 under the action of 4the spring 108 l'engages the olf-set portion 109 and holds the rack in its depressed potion until the type Acarriage is completely returned by the action of a suitable spring and tape 110 whereupon the member 111 carried b disc 107 orcing 1t back against the action of spring 108, thereby permitting rack 57 to return to normal and reengage the worm wheel 58. Thus it will be seen that by means of one roup of signaling impulses the three auxiliary functions, namely, carriage return, line feed and ribbon feed may be effected simultaneously. It is preferable that when the type carriage is being re.

turned for commencing a new line there should be no unnecessary friction between the stationary and movable parts. There; fore it is desirable that means be provided to prevent the striker bar 39 from engaging the arms 50 an'd 51 of the type carnage while it is being returned. This `is accomplished by providing two arms 112. and 113 rigidly secured tothe rod 5 5, so that when therack 57 is depressed and the rod' 55 rotated, arms 112 and 113 will act upon the members `48 and hold them outl of engagement with the members 46, thereby preventthe type carriage engages theing actuation of the striker bar until the .type carriage isv returned and the rack 57 has been released. The striker bar 39 is normally heldby means of spring 45 so that the 'adjustable member 46 presses against the end of the arm- 48. The spring 45'is suliicient tohold the members -46 and 48 ,normally in engagement with one another and is of lsuch strength that 'when the arm 48 is forced out of engagement with the` member 46 and the reciprocating arm 115 moves forward, the spring 45 will prevent the striker bar 39 from engaging the extensions 50 and 51.

- Occasions 'frequently arise when the receiving operator desires to move'or return the type 'carriage independently of the automatic'means'herein described. For the accomplishmentof this object the supporting rod 55 lis provided with a-sleeve 116 which is rigidly secured thereto. The sleeve 116 carries a pin 117 which is adpated to beengaged by a manually operable' lever 118 pivotally mounted on rod 55.. -When the lever 118 is pulledforward it engages the pin 117 vandrotates the lsupporting rod'55. From' reference to Fig. 1 it will be seen that the bracket arms 55"and,56 (one ofwhich Ais clearly shown) which support' the rack bar 57, are rigidly lsecured to the shaft 55 so that when the shaft 55 is rotated the rack bar 57 will be moved outof engagement with the Worm wheel 58, and thereby permit the operator tomove the-type carriage freely to any desired position, I When'the rack bar 57 is 4moved out of engagement with the worm wheel 58 the locking disk member 107 will engage the off-set portion at the rack 57 and' hold it outof engagement with the worm wheelI until the disk 107 is moved to its normal position to permit the rack bar to return to normal.

Pape?4 tearing edge.

In Figs. 1, 2Y and 6 is shown an adjustable paper tearing edge which in addition to serving as a reliable and efficient paper tearing device in no way interferes with the visibility of the printed message. The papertearing edge consists of a flexible cord or wire 119 stretched tightly across and near the' paper platen. In Fig. 6 the cord 119 is shown connected at one end to a stationary member 120 on an upright 121, while` the opposite end of the cord 119 is shown connected to an adjustable member 122 carried by an upright 123, which is rigidly connected to the corresponding upright 121 by the connecting portion 124. The holder consisting of the arms 121 and 123 yand base portion 124 isA arranged to be pivotally connected to any suitable part of the frame mechanism by mean's of hinges 125. In addition to the tearing edge 119 there is provideda similar cord or wire 126 which extends parallel with the cord 119 and is connected to the members 120 and 122 in the same manner as cord 119. The cord 126 is arranged to res't closely against the paper or printing medium while the tearing edge is held a slight distance away from the paper. The cord 126 serves to retain the paper in engagement with the platen when the strip or sheet is torn off along the cord 119, thereby making it unnecessary to start the end of the paper under the tearing edge b hand. It is desirable that the tearing e ge be of small diameter and of material having high tensile strength. In this connection fine piano wire has been found to be very satisfactory.

The paper tearing edge is useful only when employing roll paper or paper of continuous length and is nonessential when i the printer 1s used for manifolding or when employing sheets of uniform length. Therefore, when manifolding, the tearing edge and holder therefor may be rotated about its pivotal bearings 125 and turned into the position shown in dotted lines (Fig. 2). Combined with the pa er tearing edge is a set of presser rollers 12 and 128, which rollers are adapted to be held in close proximity with the paper platen when single strips of paper are employed. There is one presser roller provided near each end of the paper platen and each roller extends through an opening in a paper shield 129 and is normally held in position by means of supporting members 130 which are held in position by spring members 131 as shown in full line (Fig. 2). These rollers aid in guiding'the paper around the periphery of the platen and are useful only when feeding single stri s of paper. Therefore it is desirable that t rollers be removed from the platen when manifolding or when feeding a plurality -of sheets simultaneously. When the paper tearing edge ils thrown back into the dotted line position (Fig. 2), the portion 124 connecting arms 121 and 123, is moved into the dotted line position, thereby forcing the members 130 and the presser rollers carried thereby down into the position shown in dotted lines. Thus it will be seen that the members 121, 123 and 124 not only serve as -a vsupport for the paper tearing edge but also serve to remove the presser rollers from engagement-with the paper platen when they are not required. Another advantageous feature of this arrangement is that when a new roll of paper is placed in the machine and it is desired to start the paper around the periphery of the platen the Auto/matie paper 'guiding cle/vice.r

The paper or printing medium on which the received messages are recorded is commonly used in roll form which may be mounted on a dowel or spindle 132 as clearly shown in Fig. 3. The dowel 132 is provided with spring members 133 for holding the paper roll in position. The dowel 132 is provided with a metal pin extending through the 'center thereof whigch pin is supported at each end by the frame of the machine. To prevent the roll from turning too freely there is provideda spring member 146 which engages the end of lthe supporting pin, and forces the dowel 132 against the Support 134. The friction set up between the spring 146 and metal pin and between the dowel and support 134is suiicient to prevent the roll from overrunning. The paper 135v is drawn from the under sideof the roll over a spring spportedidler or guiding roller 136, thence under, v around and over the platen, thence over the paper supporting fingers 137 to a suitable spool or take-up device. The guide roller 136 consists of a cylindrical surface with spool heads at each end thereof and ri idlysecured to a rod or center pin 138. l T e spool or roller 136 is supported at each end by flexible springs 139 and 140, one end of each spring being rigidly connected to a suitable portion of the frame and the other end arranged to Vshield Vor onally of the paper and may even eventually prevent or interrupt the feeding of the paper.

VTo avoid such a condition this invention contemplates the provision of means for automatically correctingV the feeding of the paper. This feature is clearly demonstrated in Figs. 3 and 4. In case thepaper, due to Yunevenness of thickness, different pressures beingY applied tothe presser rollers, or for,

any reason` Whatever, travels faster on one side than on the other and consequently travels over to the right or left of the center, the paper in passing over the guide roller 136, Will force the roller and sup orting pin 138 sidewise, so that the end o the 'pin 138 Will engage the stationary frame 141. Therefore, as soon as one end of the rod 138 is held rigid by its engagement with the stationary part of the printer frame, only one end ofthe guide roller Willlbe free to oscillate, and Willtherefore automatically correct the travel of the paper by causing a greater pull on the edge of the paper which Vhas been gradually falling behind, and as soon as the travel of the paper is correctedthe guide roller Will be moved to its former position so that it will again be free to oscillate until the paper forces it in one di-v rection or the other a sufficient distance to again cause the rod 138 to engage the stationary frame portion of the printer.

The paper guide fingers 137 are carried by flexible spiral springs 142 and 143', which springs are mounted on arms 144 and 145 respectively, and which arms are pivotally connected inV any suitable manner to the frame. It will be Vnoted that the guide fingers are so supported that the center of the paper is open or exposed thereby making it easy to change the paper rolls and to start new strips of paper around the platen.

i These'fin ers are also arrangedso that when Vi'nanifoldlng or when 4feeding a plurality of sheets, the fingers may be moved back out of the Way as shown in the dott-ed line position (Fig. 2). This position is of positive utility in handling' books of flimsy, keeping them, out of the cam shaft.

Fig. 5 is a detail view showing a paper Y ide 129 and a flexible metallic band 146 or causing the printing medium to conform to the periphery of the platen. One end of each metallic spring is connected toa set offlexible lingers 147 best shown in Fig. 1, Which'ngers are also for the pur- ITnrlse of holding the paper close to the platen. 'e other end of each metallic band 146 is connected by a sp1ing'148 to the paper shield @129 or any suitable stationary' part of the frame. Y

What is claimed is: 1. In a telegraph `receiver in combination with a movable carriage, a selecting mecha for line spacing, ribbon feeding mechanism,

and means controlled by one of said code bars for operating said line spacin and ribbon feeding mechanisms and for e ecting return of the carriage.

2. Ina telegraph receiver in'combinationwith aimovable carriage, a selecting mechanism comprising selecting ma ets and selecting bars controlled thereby, means for moving said carriage in one direction step by step, a paper platen, mechanism for rotating said platen V'forline spacing, ribbon feeding mechanism, and means controlled by one of said code bars for operating said line spacing and ribbon feeding v mechanisms simultaneously and for eecting return of the carriage.

3. In a telegraph receiver in combination with a movable carriage, a selecting mechanism, code bars cooperating with said selecting mechanism, means for moving said carriage lin one direction step by step, a paper platen, mechanism for rotating said platen for line spacing, ribbon V feeding mechanism, a magnet for operating said line spacing and ribbon feeding mechanisms, and a code bar for effecting return of the carriage and for controlling the operation of 'comprising a plurality of type bars movable transversely with .respect to said platen,

a racka Worm gear cooperating with said rack to move 4said carriage 1n one directlon ste by step for line printing, means nor- `ma ly tending to return said carriage, and

manually operable means associated with' said rack for effecting the removal thereof from said Worm gear to permit the return of said carriage.

6. In a telegraph receiver, a movable type carriage comprising a plurality of type bars, a rack, a Worm gear cooperating with said rack for moving said carriage in one direction, step byy step forline printing, means normally tending to return .said carria e, selectively operable means for returning t e carriage to normal, and means independent of said selectively operable means for effectin returnv of the carriage.

I. In a telegraph receiving printer, the combination of a movable type carriage comprising a pluralityy of type bars, a rack, aY

Worm gear cooperatin Withsaid rack-for moving said carriage 1n one direction step by step for line printing, means normally tending to return said carriage,pmechanical means selectively operable for disengaging said rack and Worm gear to permit the return of said carriage to normal, and means independent of said mechanical means for effectingthe return of said carriage.

8. In x.a telegraph receiving printer, the combination of a movable type carriage comprising a plurality of type bars, a rack, a Worm gear cooperating With said rack for moving said carriage in' one direction step by step for line printing, means normally tending to return said carriage, mechanical means selectively operable for'disengaging said rack and Worm gear to permit the return. of said carriage to normal,` and manually operable means independent of said niechanical means'for effecting the return of said carriage.

- In WitnesswhereoL-I hereunto subscribe myrname this 18th day of October, A. D. 1918.

ARTHUR H. ADAMS.

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