US1864521A - Typewriter - Google Patents

Description

June 28, 1932. R. ATTI 1,864,521

TYPEWRITER Filed Feb. 6, '1929 Patented June 28, 1932 UNITED STATES .RALPH ATTI, or UNION CITY,

NEW JERSEY, ASSIGNOEI T CLAUDE '1. RICE, OF NEW YORK, N. Y. I

TYPEWRITER Application .filed February 6, 1929. Serial No. 337,757.

This invention relates to typewriters, particularly the class of typewriters known as noiseless typewriters.

It is an object of the invention to provide an improved type action for typewriters.

More specifically, one object of the invention is to provide a type action in which the typeis advanced to a point opposite the platen and is then pressed directly toward the le' platen.

It is a further object of the invention to provide a type action in which the type is first advanced to a position opposite the printing point and is then moved by the action of cams to efiect printing.

It is a further object of the invention to provide a type action in which the type is advanced by the movement of levers to a po- ,7 sition opposite the printing point and is then 20" moved by the action of cams in a direction transverse to its first movement to effect printing. 7

lVith these and other objects in view the invention consists in the novel devices and a combinations a representative embodiment of which is shown in the accompanyin drawing, and will be hereinafter described. In the drawing: i Fig. l is a fragmentary transverse sec- :3 'tional elevation of a machineemb'odyingthe present invention, the type bar being shown in its retracted or normal position.

Fig. 2 is a fragmentary transversesectional elevation showing the type in printing po- 21 sition.

The machine comprises a platen 10, and keys 11, pivoted at 12, and urged to normal position by suitable means, such as springs I 13. Attached to each of the keys 11 at an ap- (fl 'propriate point is a link 14 which engages a lever 15, pivoted at 16. The arms of the levers 15 are proportioned to give the correct travel to the type bars which are associated therewith in the manner to be present- (l' -ly explained, and the levers are bent in such a way as to bring the arms to the correct position to effect the proper movement of the type bar when any key is depressed. Pivoted to each lever 15 is a link 17, having a :1 pivotal connection at 18 with a foot 19 depending from a slidebar 20 which moves in a suitable guide way 211 in a fixed frame'21. A suitable cushioning member 22 may be placed in the closed end of the guide way to reduce the shock and noise otherwise incident to the spring actuated return of the parts to normal position. i The invention contemplates advancing th type to a position opposite the printing point on the platen, andsubsequently pressing the type directly toward the platen'with substantial force. The particular arrangement of devices for this purpose which has been selected for the purpose of illustration is constructed as follows. Toeachslide bar 20 is pivoted a type bar 23, provided with .a head 24: carrying one or more type 25. In the illustrated form of the invention,when the parts are in normal position the type bars lie substantially. within the guide ways 211. Suitable means, such as lightsprings 26, may be provided to ,hold the typebars fromprematurely turning about their pivots. Therelative location of the parts is such that the first or forward movement of a type bar brings one of'the type thereon to a position substantially opposite but slightly removed from the printing point on the platen 10.

The movement of the type from the position just described, toward the platen to ef- .80

fect printingmay' be accomplished in the following manner. The rearward end of each type bar is provided with a small projecting stud or cam follower adapted to engage the peripheryofan enlarged head or cam on the 35 link 17. Said cam comprises a long dwell or inactive surface .28, concentric with the pivot 18, and a sharply inclined active surface "29, terminating in a second dwell 30.

The arrangement is such that as one of the type 25 comes opposite the printing point the cam follower 27. traverses.theinclined surface 29, rocking the .typebar about its pivot and pressing the type toward the platen.

The operation of theillustrativeembodiment of the inventionmay besummarized as follows; When a key 11 is depressed, rocking about pivot 12. and tensioning its spring 13," its movement draws the link 14 s but a slight advance of the type bar.

downwardly, rocking lever 15 about its pivot 16. The movement of lever 15 advances the link 17 and with it the slide bar 20 and its type bar 23. At the same time the link 17 rotates about its pivot 18, the cam follower 27 transversing the concentric surface 28 of the head of link 17.

Owing to the obliquity of the toggle formed by lever 15 and link 17 the initial movement of a-key 11 effects a rapid advance of the type bar. As the toggle straightens (Fig. 2) the type bar advances more slowly, until adjacent the printing position of the type a relatively long movement of the key eifecAts s the type comes opposite the platen the cam follower 27 engages the incline 29, rocking the type bar aboutits pivot against the tension of spring 26, and forcefully pressing the type directly toward the platen, thus making an impression from the type upon the platen or a record sheet thereon. Upon the release of the key the parts are restored to normal (Fig. 1) position by the springs 13.

It isto be understood that the specific embodiment which has been illustrated and described is but a representative form of inventions which may take other forms, all falling within the scope of the appended claims.

What is claimed is:

1. In a device of the character described, a platen, a key, a type bar'carrying type means to guide the movement of said type bar, and a single train of connections intermediate said key and said, type bar whereby said type is first advanced in a substantial straight line tota point opposite said platen and subsequently moved in a direction transverse to its first movement to eflect printing on said platen, said train of connections including a link to noiselessly stop the movement of the type bar.

2. In a device of the character described,

means mounted for rectilinear movement,

type carrying means pivoted to said first named means, and a single actuating toggle link adapted to first rapidly move said first named means while holding said type carrying means from rotation about its pivot, and cam means to subsequently rotate said type carrying means about its pivot.

3. In a device of the character described, a frame, a bar mounted for rectilinear movement upon said frame, a type carrier mounted on sa d bar and actuatlng means for moving said bar and for moving said type carrier relative to said bar, said actuating means comprlsing a toggle joint,one of said toggle members being provided with a type depressing cam.

4. In a device of the character described, a key, a toggle lever, half of said toggle lever being a bell crank pivoted to a fixed pivot, connections from said key to said toggle lenature to this specification.

ver, a type carrier and means whereby the movement of said toggle lever effects two substantially different movements of said type carrier, said toggle lever adapted to noiselessly stop the movement of said type carrier.

5. In a device of the class described, a type carrier, and means for giving said type carrier first a rectilinear movement and subsequently a rotary movement comprising a toggle lever, a cam upon said toggle lever, and a cam follower upon said type carrier.

6. In a device of the class described, a type carrier, means for giving said type carrier two substantially different movements comprising a toggle lever a cam and a cam follower, one of said cam members being mounted on said type carrier and the other cam member being mounted on said toggle lever.

7. In a device of the character described, a frame, a slide bar in said frame, a type carrier pivoted to said slide bar, means for advancing said slide bar, a cam and cam follower associated with said means for moving said type carrier on its pivot, said cam being inactive during the advance of the slide bar and depressing the type bar after the full advance of the slide bar.

8. In a device of the class described, a type carrier pivoted to a slidable support, a toggle lever connected with said support, a cam on said toggle lever, and a cam follower on said type carrier co-operating with said cam, said cam having a long dwell thereon, said toggle lever adapted to move said type carrier in substantially rectilinear movement during said period of dwell on said cam, and in rotary movement on the balance of movement of said cam.

9. In a device of the class described, a platen, a type on a type carrier, and means for advancing said type to'a point opposite said platen moving said type directly toward said platen and subsequently restoring said type to normal position comprising a slidable 'member, a pivotal connection between said slidable member and said type carrier, a lever, a pivotal connection between said lever and said slidable member, a cam on said lever, a cam follower on said type carrier and resilient means for holding said cam follower in contact with said cam.,

In testimony whereof I have aflixed my sig- RALPH ATTI.

Images