US2612253A - Device to restore forcibly interferingly operated type carriers - Google Patents

Description

Sept. 30, 1952 w, HELMOND DEVICE TO RESTORE FORCIBLY INTERFERINGLY OPERATED TYPE CARRIERS Filed Dec ATTORNF Patented Sept. 30, 195 2 IDEVICE T RESTORE roaommr INTER- FERINGLY OPERATED TXPE CARRIERS ApplicationDecember 12, 1950, Serial No.2003461 I lhis invention relates I to typewri-tlng machines and'more particularly to devices for forcibly restoring type actions which due to too closelysuccessive operations have interfered and "have bec'ometiedup against free spring urged return. The'invention, as will he noted later; relates also to margin release mechanism for conditioning the machine to pass normal-writing margins predetermined'by a margin stop mechanism.

Devices to :restore type actions forciby are known in the art, and heretofore have included an operating-control whichis additionalto the conventional other operatingcontrol's in the machine.

:According to the present invention it has been conceived to operate the margin release mechanism "and the type action restoring mechanism by a \common. control :or :key, the object being to hold the number .ofkeys ln the keyboard to a 0 minimum, thereby .inot only tohold the cost of the machine down, but more importantly to simplify the'controlmovements .for tending the machine.

It is another object :to provide efilcient and simple mechanism for :convenientlyand forcibly restoring tied .up type'action.

."Refer'ringnow tothe drawings, v

Figure .1 is a. fragmentarysectional'side elevation of a typewriting machine embodying the invention, .the section being taken substantially alonglineIl-iof Figure. 2,

Figure 2 is afrontlviewof certainrparts of the machine seen in Figure :1. I

The mainv frame. of themachine comprises two spaced side walls l0 connected by a track structure ll upon which'a carriage [2 for support of a work sheet is guided. The carriage includes a grooved rail I3 which is associatedvwith the track structure H by means of anti-friction elements I4. End plates I 5 rising from saidrail l3 support a conventional platen roll [6. At the rear of the carriage there extends parallel thereto 'between therend plates a rod 1 1 whereon there are carried a. left and a right margin stop, respectively numbered l8 and I9. 7 1

The machine comprises a system of type actions such as fully disclosed in the patent to Helmond, No. 2,072,878, dated March 9, 1937. Said type actions include each a type bar, and one such type bar, at the middle of the system, is shown in Figure 1 and numbered 20. The type bars 20 of the system comprise an array which is arcuate as viewed from the front of the machine, and the individual type bars are swingable toward a common printing point on the platen about a pivot 2 Claims. (01. ice-22) wire 21' which is 'symmetrically arcuate withre'fer enceto the stated arcu'ate type bar ystem. All

type bars in the final printing appr0ach"?t6-' ward thepla'ten enter a usual type guideiz hand are accurately guided thereby.

The various type actions include-each a.. "su b'-' lever 23 and the latter are accommodated, trans versely spaced in the machine, ona pivot wired-4;

Referring particularly als to Figure 1 2 ,th'e 'tarious levers '23 are upreaching from' the pivot wire 24 to graded extents, 'for'wire links "2 5 to connect the upper ends of the levers operatively similarly to the related'type bars 20. By means not-shown;- but fully disclosed in said patent, typekeys' fl'o provided in the keyboard or the Inachine-ar'efin operative control of said levers' iltolswing them in a direction away from the platen -to thereby 'actuate'th'e type hars 2=0 for printing. Springs-12 i individual to'saidlevers 23 serve to return-the type actions individually to-their-ncrmal rest positions wherein all the type :bars 20 extend horizontally from the pivot wire2 l y he a The carriage l2 i's under control of "a usual letter .feed escapem'ent, not shown; which allows stepwise turning offa pinion-28 :fmeshing with at rack 29 on the carriage. r H The margin controlling mechanism, additionalto the left and right margin stops I8, :19, includes a'counterstop in the form of an arm 30 which reaches upwardly; through a perforation :3 Fl Jina top iplateLfl of ausual housing. Said counter-. stop arm3'01has at its lower *end a verticalslot 35, see'Figure-a. 'Into' this slot -reachesia 15111136? which is fast on a bracketf31,',i1the latter-carried fast on acrossbar-3.8 of the-machine? Said coun terstop arm 30,1under the urgeiof aspring A0,'3is:

normally held elevated to the limit providedxby the lower end of the (slot 35. abutting upwardly againstsaid Ipini36. Said spring 40 moreover urge'slathearm 30' to swing to the "righa'limitiin said perforation 3i. .:-Atrtheend:of each carriage return the. margin stop 18 limitedlyzengagescthea upper end io'fithe'counterstop aria-301': .nn- 'theii lever 4| to swing a front end 42 thereof out of registering relation with a clearance notch 43. v provided in a usual type bar actuatable universal V V bar 44. The lever front end 42 then blocks the universal bar 44 against escapement actuating operation and this in turn blocks the type bars 20 against printing Operation. Either of the p stated margin limits may be passed by operation of a margin release mechanism which lowers the counterstop arm 30 below the range of the margin stops l8, [9. This margin release mechanism comprises a lever 45 having a forwardly reaching arm 46 bearing a key 41, and comprising also a rearwardly reachingiarm 48, thelever beingpivoted intermediate the arms 46, 48 at 50. A spring urges the lever to occupy normally the position seen in Figure l. The rear end of the lever arm 48 underlies the right end of a crosswise extending lever 52. The latter is pivoted intermediate its ends on a rigid bracket 53 and has at the left end a pin-and-fork connection 54 with the lower end of the margin stop arm 30. It follows there fore that if it is desired to return the carriage beyond the normal limit provided by the margin. stop l8, or when it is desired to continue to type mechanisms had to be recognized and such recognition constituted a vital step in arriving at the aforedescribedinvention.

While only one embodiment of the invention has been shownandidescribed, many variations may be resorted .to within the scope of the invention, and portions of improvements may be used 1 without others.

when the position defined by the line end marginstop I9 is reached, this can be done by operation of the key 41, which causes the counterstop arm 30 to be lowered below the range of the margin stops {8, l9. 7 h

At the front of the sub-levers 23 of the various type actions there is provided a bail 60 which extends-transversely of the machine and comprises laterally spaced upright arms 6| and a downwardly arced bridging memberiZ, The are of the bridging member 62 is formed for contact with the varioussub-levers 23 near their upper ends. Short studs 63 reaching inwardly from the opposite side walls 10 of the machine give pivotal support to said bail at the lower ends of its arms6l.

Whenever the type bars vi0, by interfering with each other, as'indicated in Figure 1 in a dot-anddash showing, become tied against free return, the bail 60 is operatedtowards the rear of the machine to force the unrestored' sub-levers 23 to their rearward,'normal positions. ,1 h

The, means for rearwardly operating the bail includes the key-bearing lever- 46 7 which: also serves to releasethe a-foredescribed margin mechanism; i-For, operating said bail Blithe ,lever'arm 46 has a link whichis operativelyconnected to a bell crank 65 having an upreaching arm-I 66: which bylmeans of a pin-and-slot connection 51 is communicative with the right bail arm 6 I .1 The bell crank isufast. on a cross shaft 68 whichis pivotally borneinthe framerends. lllxof the machine. At the left end of the shaft .68. there rises an arm 69,.similar, tothe arm 66, having apin-p and-slot connection ,161; with the left; bailarm:- 6 t. The structure comprising the shaftv 68V and the arms '66, 69 cooperates: with the;.relatively frail bail 60 towcauseitsopposite endstojmovein uni-:

The axis for the. ball 60 as afl'orded by the studs 63 lies-closely in frontal theipivot rod: for the 'various'sub-levers. 23. It has been infeasible to. provide. a shaft connection directly between the arms 6| of the bail becausethe various key levers;

in the machinetake up the space for What is claimed is:

-1.'Ina'typewriting machine having a frame. a letter feeding carriage, and spring-restored individually operabletype actions which if operated intoo close succession Will byv interference bind against eachother and failto restore anelement on the frame and an element on the carriage normally in cooperative margin controlling range with each other, a bailextending transversely'of the machine and normally clear of the operating paths of said type actions but operable torestore forciblyany type action failing to restore, a key. lever extending fore-and-aft'in the machineiand comprising a rearwardly reaching arm and also a forwardly/reaching key-bearing arm connected. to saidbail to operate the lat-tenand means oper-' ated by said rearwardly reaching arm to move said elements relatively out of cooperativemargin controlling range.

2. In a typewriting machine having springs. restored individually operable typeactions which if operated-in too close succession will-byinte'rs, ference bind against: each other and'failt-tofre v store; a transverselyv extending restoring bail for said type actions normally out of their operating: paths and comprising laterally spaced..larm's swingably. supported in the machine and a brideing member extendingxintermediate the swinging ends of said arms, a transverse shaft pivotally supported in the vmachine and having arms fast at its opposlte'ends operatively connected to the spaced arms of "said restoring bail to cause them to swing in unison, andmea'ns, including" an operating key, to rock saidshaft for-operationo'f said bail in unison at both ends to restore'type actions that have failed to restore;

1 REFERENCES CITED" The follow I file t rates? I a UNITED sTA EsPA r-E'N'rs' Number I.

1 HELMONDYL ingre'ferences are of recordin the" nae

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