US2182433A - Typewriting machine - Google Patents

Description

Dec 5, 1939. H. J. HART Y 2,182,433

TYPEWRITING MACHINE Filed July 9', 1937 2v Sheelzs-Sheefl 1 Q s o@ W R ,TH-5 I wif DLLLLJ ATTORNEYS Dec. 5,i939. H. J. HART TYPEWRITING MACHINE um, n n hn M J s R 0 M m mw. m n m n 2&1* m A Filed July 9, 1937 Patented Dec. 5, 1939 G MACHINE Henry Joseph Hart. West Hartford, Conn., al-

signor to Royal Typewriter Company, Inc., New York, N. Y., a corporation of New York Application July s, 1937, serai No. 15am z claims. (ci. v11u-o4) This invention relates to new and useful improvements in typewriting machines generally, althoughmore particularly to a brake mechanism associated with the tabulator mechanism thereof.

5 One of the objects of the invention is to provide an automatic brake mechanism for retarding the speed of the carriage when the escapement mechanism is released upon depression of a tabular key, whereby the blows of a tabulator stop against l the center or tabulator stop nger will be softened and consequently the usual carriage rebound ywill be prevented and the impact noise will be reduced.

Another object of the invention lies in the prol vision of such a brake mechanism which will remain ineffective until the carriage has moved a predetermined distance, whereby the speed of the carriage will not be reduced at the time short tabulating jumps are being made at the extreme right hand end of the carriage.

With these and other objects in view which will more fully appear, the nature oi the invention will be more clearly understood by following the description, the appended claims, and the several views illustrated in the accompanying drawings.

In the drawings:

Figure 1 is a vertical sectional view of a typewriting machine embodying my invention, the escapement rack bar and the brake being shown in their normal positions,

Figure 2 is an enlarged vertical section showing the escapement rack bar in its elevated position,

the brake in its operative position, and a tabulator in section, showing the escapement rack and pinion, and the brake in their normal positions.

Figure 8 is a similar view but showing the rack elevatedl above the pinion and moved to the left, and the iexible brake coupling at the beginning 5o of the eilective braking action,

Figure 9 is an enlarged horizontal section taken on the line 9-9 of Figure 8,

Figure 10 is a vertical section taken on the line IU-IU of Figure 9, and Figure 11 is a perspective view of the link which connects the brake mechanism with the tabulator stop finger.

vI have `shown my. invention as applied to a Royal standard typewriting machine such asis shown in the patent toMyers 2,007,611, July 9, 6 1935although itwill be understood that the invention may be applied to other typewriting machines if desired. n v

'I'his machine includes the usual main frame A which supports a non-shiftable track 2 upon l0 which runs a carriage rB having end plates 3 which support a platen I, the main frame including the usual rear wall 5, and the carriage being normally urged towards the left by the usual spring motor (not shown). l 16 'I'he usual escapement mechanism is provided for feeding the carriage at letter space intervals upon depression oi'a key lever C. This mechanism includes a feed rack bar 6 which is attached to an angle bar or frame 1, and the latter is pro- 20 vided with rearwardly extending arms 8, 8 which are pivoted to the end plates 3,3 of the carriage as at 9,9.v 'I'he carriage also includes the st op bar I0 on which the usual margin stops are mounted for engagement with the usual center 25 stop lever. Springs II are connected to the arms 8 and the stop bar IIIi and function'to normally retain the rack barv 6 in engagement with an escapement or feed pinion I2 which is Journaled on a shaft i3 mounted on the bracket I1. An 3o escapement wheel I4 which is mounted to rotate with the pinion kI2 cooperates with the usual escapement dog (not shown). A rack bar lift lever or operating member I5 is pivoted as at I8 on the bracket I1 which is mounted on the car- 35 riage track 2 and in which the shaft I3 is jour-'- naled. The lift lever I5 is disposed under the rack bar I6 and is provided with a downwardly extending arm I8. I'helift lever I5 is raised in the usual manner upon depression of the tabular 40 key lever E to thereby release the escapement and effect a jump movement of the carriage.'v

Supported by the endy plates 3, 3 of thecarriage is a tabulator stop frame D which supports a plurality of tabular stops I9 arranged at letter 45 space intervals. These stops are individually swingable forwardly andre'arwardly from an operative position to an inoperative position, or vice versa. A bracket 20 is iixed centrally'to the rear wall 5 ofthe main frame A, andmounted to swing 50 about a horizontal pivot 2l on said bracket isla tabuiator 'stop finger or center stop 22. The up per end of the finger 22 projects upwardly in rear of the stop frame D, and is movable 'forwardlykk into the path of the tabular stops I9 when the 55 e latter are in their rearmost or operative posi-` tions. A link 28 is pivoted at its forward end as at 24 to the rack lift lever I5. and at its rear end as at 25 to a rock arm 25a which is movable with the stop finger 22. A horizontal bracket 25 is attached to the front face of the rear wall 5 of the main frame. and fulcrumed on said bracket to swing about a vertical axis 21 is a power transmitting lever 28 having along arm 25 and a short arm 80, the long arm having a projection 28a which is disposed in rear of the depending arm I8 of the rack lift lever I5 and forms a loose connection therewith whereby theescapement mechanism will be released whenever a tabular key lever E is depressed. A power transmitting lever 8i is also fulcrumed on the bracket 28 to swing about a vertical axis 82, and includes along arm 88 and a short arm 84, the latter being disposed in front of the short arm 80 of the lever 28 and in over` lapping relation therewith whereby upon forward movement of the long arm 88 the long arm 28 of the lever 28 will 'be moved forwardly to swing the arm I8 of the rack lift lever and thereby release the rack bar 8 `from the pinion I2 and simultaneously swing the tabulator stop finger 22 into the path of the tabular stops I8. The tabular key lever E is -located in the key board and preferably on the right hand vsideA thereof. This lever E is fulcrumed on the main frame A as at 85 and is yieldably held against depression by a spring 36, the spring normally retaining the lever against a stop 81 mounted on the main frame. 'Ihe lever E is provided with an upstanding arm 88 which is pvotally'connected to the front end of a link 89, the rear end of the link having pivotal lconnection with the long arrn 88 of the transmit- Thus upon depression of the ting lever 8i. tabular key lever E the rack; 8 .will be separated from the pinion I2 to thereby free the carriage B from the escapement mechanismI and simultaneously'move the stop finger 22 forwardly into the path of the oncoming tabular stop I9. Upon release of the key E the racklwillleturn to its ,f

normal position'i'engage againstfurther movement by the holding dog of the usual escapement.

An automatic brake mechanism is provided for retarding the speed travel of the carriage when the carriage feed rack 8 is released from the pinion I2 upon depression of the tabular key lever E. thereby softening the blow or impact ofthe tabular stops I9 against the tabulator stop ilnger or center ston 22 and also preventing any rebound of the carriage.

To this end. the racklift lever I5 is provided with a laterally projecting ear or arm 40, and fixed thereto is a. forwardly extending bearing shaft 4I and .iournaled on this shaft are a restrained member or friction brake drum 42 and a pinion member 43 which are ,coupledtogether by a flexible coupling comnrisinga coil spring 44'having its ends respectively` anchored to said drum and pinion. The pinion is normally disposed below and out of contact with the-rack 5 but is adapted to .be elevated into engagement therewith when the rack is elevated by the rack lift lever I5. Fixed to the inner face of the brake drum 42 are two stop pins 45, 4,6 which are spaced apart less than preferably 90. Astop pin 41 which is flxedto the inner face. ofthe pinion 48. normally` intermediate its ends as at 48a on the arm 48 of the rack lift lever I5 so as to rock about an axis transverse to the axis of the pivot I8. 'nie upper arm 48 of the brake lever terminates in a brake arm 4or shoe 58 which overhangs the drum 42 and the lower arm 5I of said lever is provided with a longitudinal series of seats l2 for adjustably receiving one end of a tension spring 58,- the other end of said spring beingconnected to the rack-lift lever I5.y The pivot 48a of the brake lever is eccentric to the axis of the brake drum 42, and consequently the brake arm or shoe 58 will be held in frictlonal engagement with the drum periphery. the amount of friction being regulated by adjusting the connection between the spring 58 and the seats 52 of the brake lever arm i In operation, predetermined tabular stops I8 are swung rearwardly into positions to successively engage. the tabulator stop finger or center stop 22 upon successive depressions of the tabular key lever E. When the key lever E is depressed. the rack lift lever I5 will be rocked to (1) lift the rack 8 from engagement with the feed pinion I2, and (2) simultaneously connect the brake pinion 4.8 with said rack. The carriageB is then moved to the left by the usual spring motor, and the brake pinion 48 is thereby freely rotated until the stop pin 4'I of the pinion engages the stoppin 48 of the drum, during which time the spring 44 is tensioned. Consequently, while the pinion 48 is rotating over 180, there will not be any braking action imparted to the carriage'by the'drum and `the braking lever, but immediately upon the tabular key lever E, the escapement mechanism,r

will become eilective, the pinion 48 will be lowered out of contact with the rack bar 8, and the'vspring 44 will rotate the brake pinion 48 vuntil the stop plnJJ/engages the stop pin 45 of the brake drum escape/12. The pins 45 and .48 on the brake drum 42 'ment pinion I2 and the carriage will be' retained and the pin 41 on the pinion 48 cooperate to function as a lost motion connection for positively coupling the rack-driven pinion memberl 48 with the frictionally restrained brake drum member i 42 only after the carriage has moved an appro action on the carriage is deferred bysaid exible coupling, until therpinion `48 has completed a partial rotation, thereby permitting the carriage to start and gain a slight headway before the brake is applied. This deferred or'delayed braking action on the carriage is of particular value when makingshort tabulating Jumps at the extreme right hand end of the carriage because it permits the carriage to make the shortiump or jumps without affecting the speed thereof.

It is of course to be understood that the details of structure and arrangement of parts may be variously changed and modified without departing from the spirit and scope of my-invention. Iclalm: .il

1. In a typewriting machine, the combination with a travelling carriage having a rack, of'a pivotally mounted operating lever; a shaft carried by said operating lever; a pinion journalled on said shaft engageable at will with the rack; a brake drum journalled on said shaft; a driving connection between said pinionv and drum; a brake lever fulcrumed on said operating lever and being movable therewith and with respect thereto and having a shoe adapted frictionally to engage the drum; and a spring interposed between and connected respectively to said operating lever and said brake lever for urging the latter about its fulcrum on the operating lever to press the brake shoe into engagement with said drum.

2. In a typewriting machine, the combination with a travelling carriage having a rack, of a pivotally mounted operating lever; a shaft carried by said operating lever; a pinion journalled on said shaft engageable at will with the rack; A

a brake drum journalled on said shaft; a driving connection between said pinion and drum; a brake lever fulcrumed on said operating lever and being movable therewith and with respect thereto and having a shoe adapted frictionally to engage the drum; and a spring interposed between and connected respectively to said operating lever and said brake lever for urging the latter about its fulcrum on the operating lever to press the brake shoe into engagement with said drum, said brake lever including an arm formed with a plurality of spring seats adapted selectively to receive one end of said spring for varying the pressure of the brake shoe on said drum.

HENRY JOSEPH HART.

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