US2062746A - Auxiliary printing mechanism - Google Patents

Description

Dec. l, 1936. M. GARBELL 2,062,746

AUXIL IARY vPRI NT ING MECHANI SM Filed April 1s, 1954. s sheets-sheet 1` 2 Dec. 1,1936. M GARBELL 2,062,746

AUXILIARY PRINTING nmmmrsg Filed April 1:5, 1934v :s sheets-sheet 2' Dec. 1, 1936.

M. GARBELL 2,062,746I

AUXILIARY PRINTING MECHANISM Filed April 13, 1934 3 Sheets-Sheet 3 i 43 "figg KV r I i IC',

77 75 MAR22 Q Patented neegfi, i936 I ulsurnli'- srirrlsl AUxmIARY PnIN'rmG MEcnANIsM Max Gai-bell,v Chicago, lll.,V assignor to Victor Adding Machine Company, Chicago, lll., a corporation oi Delaware Application April 13, 1934, Serial No; *120;397

t 190mm. (o1. 101e-fes) -This invention relates to an auxiliary printing unit and is illustrated as being attached to an f adding 'machine with the printing portion thereof alignedin the printingline for making an im- 5 pression simultaneously with those ofthe type bars actuated during the operation of the machine.

A unit of this kind is shownasmounted adjacent one side of the type bars of the adding machine and is adapted tomove into and out of the printl ing line being .yieldingly retainedin normal re.`

tracted position and readily engageable by means of links and levers extending into the path of the unit and the operating mechanism of the adding' machine.

l The printing portion of the unit as shown will print a serial number'an'd the date, but these characters may be changed, as they form no part of the present invention other than to be automatically` adjusted with each operationof the 9 0 machine while others of the characters are manually adjusted. Y

The chief objects of the invention are the pro'-l vision `of a printing unit having adjustable elements, som`e of which have characters, whilev others have digits thereon and which are mounted to move in a path with the unit for an impact against a platen or other suitable backing member and to be automatically restored and retained in a normal at-rest position, being also provided with -3'0 a feeding mechanism'which automatically adjusts 'some ofthe printing elements with each'operation of the unit.

A further object is the provision oi an 'actuating or tripping mechanism adapted to engage the unit for moving the same against the' tension of its spring which draws the unit for an impact against the platen or backing member as the tripping mechanism is released therefrom in the normal operation of the machine, and said unit be- 40 ing provided with'ya yieldable retaining means which normally withholds the same out of the path of the platen or `backing member after the impact thereof against said platen or backing member.

.45 A still further object is the provision, of a movable engageable member carried on the unitl which is yieldingly retained into the path of the actuating or tripping mechanism which 'when engaged thereby, will cause a normal-Ioutward vmovement ofthe unit against the tension of its spring for vcausing an impact oi the digits and characters when released against the platen and wherein the said engageable means will yieldingly ride over operation of the machine.

and again restore itself for lengagement by the tripping mechanism witheach operation of the machine by means of the normal tension exerted by a yieldable means which serves in the capacity of restoring the unitand for positioning the feeding mechanism thereof readily operable with each A nd a still further object is the provlsionfof manually operable means for positioning and retaining the engageable means -out of the path of the tripping mechanism so as to be ineffective therewith to render the unit inoperable with said 10 tripping mechanism during the driving operations of the machine;- to provide means for bodily adjusting the unit longitudinallyof the platen or backing member whereby the printing elements may be spaced 'at various distances with respect to 5 the typebars of the adding machine, and wherein also, thefinking ribbon is automatically and simultaneously adjusted with, the unit providing an inking means therefor.

Referring to the drawingsf- '20 )Figure l is a top plan,view of the type bar por--` tion and ribbon spool plate of an adding machine with my'printing unit mounted thereon by means of a supporting plate extending outwardly on one side thereof andon which the unit is mounted to 25 -slideadjacent the type bars.

Figure 2 isa face elevation view takensubstan# tially on the lin'e 2-2 of-Fig. l looking in the` direction of the arrows f, Figure 3 is a side elevation illustrating the rib- 30 bon spooll plate with my device mounted thereon and the actuating mechanism therefor connected to the operating mechanism of an adding machine.

-Figure '4 is an enlarged' cross-sectional view Vtaken on the line 4-4 of Fig. 1 showing the. yield- 35 able means for -holding 'the unit in retractedposition and in dotted lines as yielding for an impact of rthe unit against' the' platen.

Figure 5 is anv enlarged detail cross-sectional view taken on the line 5-5 of Fig. 1.- 710 Figure 6 isan enlarged detail cross-'sectional View similarto Fig. 5 illustrating the device as bef ingrretracted and in engagement with the platen m dotted lines;

45 Figure 'Tis an enlarged side elevation of the U-A shaped rockable member illustrating the openings therein into which the pins extend toA connect the arm thereto forl actuating the same. r

Figure 8 is 'an enlarged detailcrosssectional*50^ view taken on the line 8 8 of Fig.- 1 illustrating j the adjustable means forthe unit supporting pute.v

Figure 911s a partial detail viewof a portion or l the characters printed-55 the ticket illustrating 30 l more commonly used for the purpose o'f printing 'I'he reference numeral I Il designates the ribbon spool plate or base which is common construction in adding machine design and onwhlch the ribbon spools II and I2 respectively are mounted being supported on the vertically extending spool "shafts I3 and I4 and secured thereto by means of the thumb nuts I 5 and I5 respectively. These ribbon spools II and I2 are arranged in side by side relation for the purpose of providing a double ribbon across the face of the usual type `bars of the adding machine and my improved unit which is'ada'pted to coact therewith for simultaneous printing with the type bars. 'I'he ribbon II as shown, extends from the ribbon spool II over a guide roll I8 n xed to the ribbon spool plate I0 and to a guide roll I9. which is fixed to the ad justablesupporting plate Ila and the rollers I8 and IS form a guide for the ribbon therebetween on opposite sides of the type bars and my improved unit. The ribbon II'then folds back upon v*itself and is,gu`ided inparalielrelation with its otherportion by means of a guide roller arranged on the supporting plate I 8a adjacent the roller I5 and which guides the same to the rollei 2I ilxed in the-ribbon spool plate I5 adjacent the roller I 8 and guides the ribbon to the ribbon spool I2. Many forms of double -ribbon arrangement may be employed with a unit of this type. as it is v iii-duplicate, providing a priginsi siip or'ucket and having a record strip for recording the amounts which have been printed on the slips or tickets. In illustrating this form of ribbon inking means, I also showfa reversing mechanism indicated as a whole as 22 which is provided with a pairof Compression springs 23 and 24 surrounding the respective vertical ribbon spool shafts I3 and g I4 for exertinga frictions] tensionito the turning movements ofithese shafts to insure a .taut parallelfribbon across the printing face of thel type ing machine (not shown), and intermittently enbars and my. improved unit.

' "I'hetypeV bars of the adding machine are designated as a whole as 25 having theusual hammers 25 which are common in their'construction being. operable by means of the hammer actuatingshaft 21 which has a bifurcated arm 28xed thereto i into which a stud 29 of a bell-crank 38 extends. The bell-crank 38 is plvotally supported for rocking movements on a stud 3| fixed to the side wall 32 of the adding machine .and has its other le`g 33 provided with a bifurcated portion 34 'adapted to be engaged by a stud 35 fixed to an arm 35 which is carried on a stud 3'I fixed to the side wall 32 of the adding machine. The arm 351s operatively connected to the driving/.fuiechanism of the addgages the bell-crank 38 for actuating the hamimers as the machine is operated.

My improved-unit designated as a whole as 35, is mounted for sliding movements on a plate Illa jadiustsbiv secured' on the ribbon spool plate 'lo and extends outwardlyand'adjacent one side .of

the typ'ebars" of the addingmachine. -The frame of the' 3 8 is Ushaped'-as'.viewed in end elevation '(Flg.=2),iandhas a bottom wall 38 and in-` tegral upwardly extending side walls 48 and 4I. The bottom -wall`35 has a plurality of studs 42, 43

-and 44`v n xed thereto that 'extend downwardly through elongated slot openings, ..nd 41 respectively in the adjustable supporting plate. I Ia.

z These slot openings 45, 45 and 41 are'arranged to lguide the. unit in its sliding movements on the 15 supporting plate Ila'and' Ifoja v to outwardly of and 44a on the respective studs 42, 43 and 44 serve as spacers and provide a three point contact for the sliding movements of the unit on the supporting plate Illa. The side walls and 4I of the frame of the unit 38 are provided with a pair of aligned transverse openings through which the shafts 48and 49 extend. 'Ihe shaft 48 4carries a plurality of rotatably mounted printing elements able indicia thereon and are arranged in groups by means of retaining members 53 which are re-4 siliently held therewith by means of ilared nger springs 54 secured at 55 to a horizontally extending member 55. 'Ihe member 55 has a downwardly extending portion 5 1 at each end thereof which is welded or otherwise secured, at 58 to the side walls 4|! and 4I of the unit 35.

The printing elements 5I are each engaged by means-of a ratchet feed dos 59 which also coacts with the integral ratchet-wheel 52 of these elements and are carried by means of a U-sh'aped rockable member 50 supported for rocking move` ments on the printing element shaft 48. The

U-shaped member 55 has an arm 5I ilxed therethis side wall 4 I by means of the pins 52 and is carried for rocking movements with the U-shaped member 5l on the'shaft 48. 'I'he 4pins 82 extendthrough arcuate slot openings 53 in the side wall 4I of the unitand fit into corresponding openings V52a in the leg 68a ofthe U-shaped member 88. The arm 5I is normally urged upwardlylby means of a 'torsion spring 54 having its body portion coiled around the free end of the shaft 48 and outwardly of or carriers 50 and 5I which are provided with suitas shown with the rst three'elements 50 adjacent .the side wall 40 arranged to be manually adjusted the arm 5I, with 4one leg of said spring engagv ing a roller 55 xed to the free end of the arm v-Iil and with its other leg extending downwardly and through an elongated slot opening 56 in the l adjustable supporting plate Illa and normally engaging a pin 51' fixed to the side wall 4I'of the unit 3 8. The pin 51 formsa permanent abutment for the downwardly extending leg of the' torsiolbspring 54 which causes its other. leg

to elevate the Iarm 5I-by means of its engagement with the roller 55. thereof.

The lroller of the arm 5I is normally retained in sliding contant with a cam sui-face sa i of a cam' member 55 fixed to'the supporting .plate Ila. and while the unit, is being moved by means of the actuating mechanism which will `be presently described, the roller 55 will ride on the cam surface 58 of this cam member 59 andcause a downward rocking movement of the arm 5l which will cause a partial turn of1one of the elements 5I. Upon a reverse movement of the unit 38, -the torsion spring 54 will again restore the arm I and as the movement of the unit is repeated, a stepv bystep feed of the elements 5I will be had so as to sequentially change Othe serial number of each record `made.` 'I'his turn or step by step 'feed o f the elements 5I is not 4new and it is thought that a brief statementof the operation will sumce for the operation thereof with! my. improved unit.

The operating mechanism for the device comprises an engageable arm 15 iixedly secured to u a stud shaft- 1| which is slidablym'ounted for longitudinal sliding movements .in'a bushing 1|a pivoted in the lside wall 32 of vthe addingmachine. The -stud shaft 1| is provided with a -keyway 1lb adapted to be engaged by means of `the depending arm lawhich is' secured to the bushing 1|a and by reason of the keyway 1lb the arms 10 and 10a arerockab'le together as a unit with the stud shaft 1|` The depending arm 10a -has its lower end portion provided with a bifurcated opening-12 into which a roller 13` extends and4 which is fixed on the bell-crank 30 by means of the stud 14. The freeupper endV 15 of the arm A,10 extends through an elongated slot opening 16 in the supporting plate |0a and through -a corresponding aligned slot opening 11 in the bottom wall 39 of the unit 38. LThe up r end 15 of the arm 10 extends intothe pat of a yieldably mounted movable member lI8 car' ried for rocking movements on the shaft 49 be-A .held in position into ythe path of the end 15 of the arm 10 by meansv ofv a tension spring 82 xed to the arm 8| thereof and to the crossmember 56. 'Thearm 80 of the movable memfber 18 is provided 'with a roller 84 carried on a stud 85 which is ixedto the free end thereof and which is` adapted to normally rest into 'a recess y86 providedin rthe edge of an upwardly 'extending arm 81 pivotally carried on the shaft 49 adjacent the extendingarm 88 of the movable member 18. The arm 81 is adapted to be moved manually and is retained in either its normal or changed position by. means of a spring fas nxed to the bottom wall se of. the unitaria has its free end portion 89 extending upwardly and formed to fit one or the other of a 'pairof notches 98 inthe arm 81.. This spring 89 oiers a suicient tension towithhold the 'arm 81 in either its normal or changed position and when moved, by rocking the same downwardly, as shown in dotted lines (Fig. 5), the notched-out portion 86 of tthe arm 81 will engage the roller 84 and cause a :downward swinging movement of the extending arm 88 and a rocking movementof the movable member 18 and raisethe transversely extending portion 19 thereof out of -portion 1e wi11 be out of the path of the enti 15 Lo. A 7 vthe spring sl is. very nght when the device is m n of the a'rm 19 and win/not be effected.

The unit 38 is adapted to-be spring-impelled for an impact against the. platen A of. the adding machine and.v a tension spring- 9| is attached t0 the depending portieri` or. the situa of th unit and to afstud 92 xedto the underside ofthe supportingplate |a. Theeifect of this tension springtl 'is to normally retain the'unit 38 adja- ,cent to andv retracted frein the platen A of the adding machine, for as shown. the tension of its normal at-rest position (Fig. -The spring 9| coacts with the torsion spring 64 in retaining the unitin its normal at-rest positioniFig. 4),`

a movement of the unit V38 leg of the spring 64 intok engagement with the end 66a of the elongated slot opening.

AS thus far described, it will be noted that as the machine is actuated, av rocking action of the arms and 10a will be had andeach rocking action of these arms will cause the unit 38v to be moved away'from the platen A by means oi' the engagement of thee'nd 15 of the arm 18 with the transversely extending portion 19 of the movame member is carried on the shaft 49:' Eachmovement of the unit 38 causedby the rocking action of the arms 10 and 18a with their pivot stud 1|, will cause the unit to be carried a given distance. against the tension of the spring 9|. 'I'he rocking action of the arm 10 and 1|la vwill cause the end 15 of the arm 10 to automati- A cally disengage the abutting portion 19 of the movable member 18 which will permit the unit to be free thereof` for-a return driving movement under the tension of 'its spring 9|. This return action of the unit 38 under the tension of its spring will be instantaneous upon the release of the end 15 of the armI 10 therewith and the V speed with which the unit is being carried under the tension of the spring 9| will cause the down-I wardly extending leg of the torsion spring' slot opening 66,the unit will again be restored Ato its normal at-rest position under a very light spring tension exerted by the spring 9| until the l restoring action of the depending leg vcauses the pin 61 to again engage this depending leg of the spring 64.

As the unit is being moved as above described.

the roller 65 of the arm 6| will be caused to ride on the .cam surface 68 of the cam. member 69 and cause -'a rocking movement of the arm 6| and'a step by step feed of theelements' formi serial numbers with each impact of th e unit gainst the platen A of the adding machine. p

The double inkingribbon arrangement is for the purpose of double printing with one impact of either the printing unit or of the type bars of the adding machine and for that purpose I provide a guard 93 adapted to be carried on the paper table B of the* adding machine for guiding the usualfpaper strip C which is fed around the platen A'by means of paper feed rolls D of the adding machine and which witlimy improved unit may provide a permanent recordI of the impressions made on the cards orutickets that are positioned in front thereof to receive the direct impact of the unit and the type bars and through which the record is made. be supported on the paper table B by means of screws 94 and provides an opening 96 therein vfor the insertion 'of the card or ticket to be printed.V

The supporting plate lila for the unit 381s carried'on the ribbon spool plate I0 `and is" adjust able thereon so as' topositionthe unit adjacent to or away from the type barsofthe adding machine. VThis adjustment'is for the purpose of positioning the unit so as to meet the requirements ofthe various types `of tickets ,that may be used with a unit of this kind. The ribbon spool plate I0 is formed with a depressed portio Theguard 93 may 'which itl may be slidably adjusted. The support- A l p K .ing plate Illa. is provided with an elongatedslot- 7 and 'tends to retain the downwardly extending .openngtc aligned with a'companin slot opening lld provided in the-extension |0b of the ribbon spool plate I0 and has a rivet |0e extending through these slot openings for retaining the supporting plate |0a slidably movable on the ribbon spool plate I0.

In order to lock theV supporting plate |0a Von the ribbon spool plate l0, I provide a depressible button or knob |0f-fixed to a member |0g which has a depending stud |0h-i0h at each end thereof. and which are provided on their free end portions with a shoulder lili- |011 adapted to extend into enlarged op/enings |07' in the. extension |0b of the ribbon spool plate |0. These shoulders |0h-I0h are urged and retained in fthe enlarged opening |07' by means of the compression springs |0k-I01c. interposed between the supporting plate |0a and the member |0g. These enlarged openings |07' in the ribbon spool plate |0 are interconnected by means of a slot opening |01 extending the entire length ofv the `enlarged openings |07', forming a continuous opening with these enlargements to permit of the sliding movements of the stud |0hf-I0h therein. When the requirements are for a larger ticket, or where the printing of the characters carried on the unit are to be .spaced a greater distance from those of the type bars of the adding machine, the same may be'accomplished by simply depressing the thumb portion |01 which will compress the springs |0Ic|0k and force the shoulders |0i-I0i of the studs IIb-|011. out of the enlarged openings |07 in the ribbon spool-plate I0 and by retaining the thumb piece i0! in its depressed position, the unit 28 and the supporting .plate |0n. may be bodily moved for a sliding movement parallel with the axisof the platen A and when the desired position is found, the release of the thumb f piece I 0f will permit the springs |0k|0k to re store' the shoulders |0|0i of the 'studs |0h|0h into the aligned enlarged openings |01 in the extension |0b o f the ribbon spool plate and retain the unit in adjusted locked posi- In adjusting the supporting plate .|0afor the positioning of the unit 38 with respect to the type or ticket used, it win be noted, that the of the keyway 1lb coacting with -the bushing "na, '5nd 1n this manner the arm 1n is rockable with the arm 10a .with each operation of the .machine regardless of the adjusted position of o spool plate Il.l It will be noted that the adjustment of the unit 28 by means of depressing the thumb piece ilf will also adjust the length of the' ribbon by means of the movement o'f the rollers I0 and 2l with the plate `|01, so that upon adjusting the unit for various positions,

the ribbon I1 will be automatically adjusted therewith to be aligned in printing relation with respect to this unit 38 and also the type bars 25 of the` adding machine.

In Figure 9, a partial detail view is shown o the ticket or slip on which the impressions of the unit and the type bars of the adding machine are made. The printing elements 5| Vof the unit print in the'serial number comprising the ilrst four numbers shown in this figure, while the printing elements 50 mark the 'month and day, and the remaining characters on the ticket such as C and 6.00, are made by the type bars oi thel adding machine.

A unit-of this type may be provided with sunlcient characters depending upon its width so as to print more characters, for example the year, and while I have shown a plurality of vprinting elements, any number may be used with..r espect to the requirements to which a unit of this typemay be adapted without departing. from vthe scope of the invention, and while I have illustrated and described my improved unit as being operable with an adding machine, the same may be applied to other types of machines, or the device may be a separate unit embodying operating parts similar to those connected to the adding machine, and insuch. a machine it may be found desirable to omit some of the operating parts without departing from'the scope of -w'ith a platen `or backing member adapted to .receive the impact thereof, a base supporting the unit, .of printing elements carried on the unit, actuating means engaging said unit for movement therewith in one direction of its travel and to then disengage the same. means exerting an increased pressure to said traveling movement of the'unit whereby said unit will be carried in the reverse direction -for an impact against the platen or backing member when said actuating means are released from engagement therewith; andl means on the unit yieldlngly engaging the `base forming means for normally retaining the unit at retracted position,said last mentioned means being free of the base while saidiunit is moved by the actuating means.

2. A printing unit of4 the character described, comprising a slidably mounted-body, a plurality of `printing elements carried on said body and extending outwardly of one end thereof, a base supporting-the body f or sliding movements thereon. impelling means normally urging said unit in one direction, yieldable means=on the unit coacting with the base normally resisting said impelling means and retaining the unit in normal position, actuating means urging said unit in a .direction against its impelling means, and to release the same, said yieldable means forming means for cushioning theA unit when released from its actuating means.

3. In a printing unit of the character described, the combination withl adjustable .printing elements employing a platen, of printing elements separate from and carried coaxially with/'the adjustableprinting. .elements and operable to print digits aligned therewith on saiii platen;c means adjusting .the digit elements for v'a plurality of successive`positions, yieldable 'stop means, an impellent for the printing unitcoacting with the yieldable stop means and normally retaining said -unit retracted from the platen, and actuating impellent and to release the same to be impelled thereby for' an impact; against the platen, Vsaid unit having means thereon 'rendering the same readily engageable by the actuating means with each stroke thereof.

4. A printing unit ofthe character described, comprising a body member having an impellent to move the same in a path to coact with a platen,

printing elements carried on the body memberv and normally retracted .from the platen, an actuating means for said unit, an adjustable member normally in the path of an adapted-to be engaged by said actuating me s to cause the movement of said body member in one direction of (its path of travel, saidy actuating means automatically disengaging said adjustable member land permitting said body member to be carried by its impellent for an impact of the printing elemnts against the platen, and manually controlled means associated with said adjustable member for rendering the same ineffective with said actuating means.

5. In a device of the character described, the combination with type carrying printing elements and a supporting frame therefor, avbase on which the device is mounted for reciprocating movement away andtoward a platen, of spring-impelled meansfor Icausing the movement of said frame and printing elements in one direction on said base, of actuating means for causing the movement of said device to exert` a tension on said spring-impelled means. and to be automaticallly disengaged therefrom, stop means including yieldable means coacting with the base whereby said` device will -be carried to normal position after said spring-impelled means have actuated the same for an impact against the platen, and means on the device forming means to carry said yieldable means therewith during its movementswith the actuating means an'd for permitting said yieldablemeans to again coact with the base for retaining the device in normal position. 6. AIn an auxiliary printing mechanism, the .combination with rotatable type carriers'mounted to move in a path into printing relation with a platen,an impellent normally urging. said printing mechanism toward the platen, engaging .means causing a normal movement thereof against said impellent and to release the same for an impact against the platen, and means adapted to be manually actuated for rendering the printing mechanism inoperable with said engaging means.

7. A printing unit of the character described,

the combination with Pa platen, of .a spring-impelled body member adapted to move in a path,l

printing elements carried on the body member and adapted to coact with said platen and being normally retracted therefrom, an adjustable member carried on said body member, a tripping Vmeans adapted to' engage said adjustable member to cause a given movement of said body member against the tension of its spring'and to be automatically disengaged Ytherefrom at the limit of its movement whereby said body member will be carried by' its spring for an impact against said platen, and feed means coacting with said printing elements .for adjusting'them with each operation. of the tripping means. 8. A printing unitof the character described,

. comprising type carrying elements having a sup'- porting frame therefor mounted for reciprocating movements on an adjustable base and .adapted to coact with a platen, spring means for causing the movement of said unit for an impact against the platen, means for withdraiivingv said unit preparatory to the release thereofy to eect printing impressions by an impactag'ainst the platen, and means for` manually' adjusting said I elements having a supporting base therefor mounted for reciprocating movementson an adjustable base, yieldable means for causing the movement of said unit toward the platen, means for withdrawing said unit preparatory to the release thereof to effect printing-impressions ofV the type carrying elements byan impact against the platen, meansiormanually adjusting said adjustable base for selectively positioning the unit longitudinally of the platen, andv ribbon inking means having a portion thereof carried on and movable' with said-adjustable base whereby upon adjusting the unit longitudinally of the platen said ribbon inking means will be automatically adjusted therewith,

12. The combination' of claim 11 hereof 1nwhich the adjustable base is-provided with lock- Ping means for holding the unit in fixed adjusted position with respect to the longitudinal axis of the platen. e

13. Thecombination of claim 11 .hereof in which the means for withdrawing said unit is movable with the adjustable base .While remain.-

ing in driving relation-with the printing unit.

14. A spring-impelled printing unit adapted to-coact with a platen or backing member and having a plurality of rotatable typeA carrying elements, rockable 'engageablermeans on the unit, of means for engaging the rockable engageable means for withdrawing the unit lpreparatory to the release thereof to effect a spring-impelled movement of said unit for an impact against the platen, and me'ans for manually effecting a rocking movement of the rockable engaging means for preventing movement of the unit during successive operations of the`withdrawing means; substantially as described. 4

l5. A printing unit adapted to coact with a platen, comprising-a body arranged to move in apath toward and away from said,V platen, printing elements carried on said body, means causingthe movement of the unit away from said .platen and. automatically releasing the. same',v

spring-impelledl means coacting with said unit carrying the same forv Aan impact' against 'said platen when said last named means are automatically released, .and 'feed meansoperable upon the movement 'of the printing -unit causing a sequential change of some of the printing elements.

16. A printing unit-of the character described,

vthe .combination with a platen arranged to back a record strip,v of a body member. adapted to move ina path with respect to vsaid platen, printing elements supported on said body member and adapted toy coact with said platen, means normally retaining lsaid member-'and printing-elements in -spaced relation with said platen, yieldable engageable-means coacting with said engage said yieldable engaging means to urge said body member a distance greater than its normal position from said platen whereby said yieldable engageable means will urge the bodymember in the reverse direction for an impact of the printing elements against said platen when said-tripping means is moved free thereof. f

17. An auxiliary printing unit comprising a frame supporting a plurality of rotatably mounted type carrying elements and adapted to move into printing relation with a platen, a base supporting the unit and having an elongated slot opening therein, yieldable means extending through the elongated slot opening in said basenormally retaining said unit in retracted posia ing elements thereon forming a `unit in printing I 5 tion with respect to the platen, spring means coacting with said unit urging the same in o dir'ection, actuating means adapted to ca a movement of said unit against the tension of the spring means and to be disengaged therefrom at the limit of its movement to permit the unit to be spring-impelled with its type carrying ele.. ments for an impact on the platen, said yieldable means being arranged for a free movement with the unit during the movement of the unit its spring means. f

1s. An auxiliary printing' unit or'tnecharaeier described, comprising a slidably-mounted body member having a plurality of adjustable printspear-io body member, and tripping means adaptedto erable upon the movement of the unit causing a 'sequential' 'change of said printing units, and

.normally urging said unit toward the platen', and tripping means connected to and operable by the driving mechanism of the adding machine for urging said unit against the tensiono! its spring 1-0 means whereby said spring means will urge the unit to cause theame to move beyond its yieldvable means which is yieldingly engaging one end of the opening inthe base and permit an impact of the printing elements against .the platen as the tripping means is moved free of said unit.

19. `An auxiliary' printing unit o! the character described,1 comprising a body member adaptedjto ,move in a 4path toward and from a platen and having adjustable printing units thereon, abase.' an impellent urging the unit toward the platen, engaging means causing a movement of the unit against said impellent Vand to release said unit for an impact against the platen, feed means op-e spring means coactingwzith said reed means and base retaining said feed means readilyoperablel and retaining the unit in spaced relation with the platen after the impact. -80

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