US1768155A

US1768155A - Typewriter

Info

Publication number: US1768155A
Application number: US186408A
Authority: US
Inventors: Schauss Adolf Fritz
Original assignee: Individual
Current assignee: Individual
Priority date: 1926-11-30
Filing date: 1927-04-25
Publication date: 1930-06-24
Anticipated expiration: 1947-06-24

Description

June 24, 1930.

A. scHAuss TYPEWRITER Filed April 25. 1927 2 Sheets-Sheet 1 June 24, 1930. A F., scHuss TYPEWRITER Filed April 25. 1927 2 Sheets-Sheet 2 m/gm, Way

Patented June 24, 1930 UNITED STATES PATENT OFFICE TYPEWRITER Application filed April 25, 1927, Serial No. 186,408, and in German;Tv November 30,-1926.

This invention relates to an improvement effected in the small typewriter according to U. S. Pat. Appl. Ser. N o. 70,490 with a typebar rest located immediately and verti- 5,cally in front of the paper cylinder. Withv known machines the considerable lengths of typebars are prejudicial to the touch. It has therefore been proposed to build small typewriters having the typebar rests verti- 1ccally arranged in front of the paper cylinder, and continuous key-levers. But owing struction of the machine, the key-levers are proportioned very short from their pivotal points to the key-heads and on account of the necessity for depression of the key-levers the key-heads, as regards the pivoting points of the levers, are located very high and mounted upon long key-rods5 the latter of Zonecessity therefore tend .to bend forward considerably on being depressed. This is especially the case with the top row of keys,

which swing out in an arc with the distance to the pivotal connection to the keylever as radius.

This considerable outward movement and slipping of the keys beneath the lingers of the typist is found to be very unpleasant and becomes very tiring with continuous ao-typing.

The principal U. S. Pat. Appl. Ser. No. 70,490 proposed to obviate this disadvantage of the continuous key-levers and to replace the latter by key-rods guided through .'islots in a guide-plate, the key-rods being tem and a more suitable location of its parts.

. omitted. to the restricted length available in the conl Ser. No. 70,490. guided' the carriage b, which rests upon the To obtain a smaller height of the machine from the base to the middle of the paper cylinder the typebars are of smaller proportions th'anwith usual typewriters.

4In the drawings a' constructional form of 55 the invention is shown by way of example, andv illustrates a machine according to the principal UQ S. Pat. ApplSer. No. 70,490, in which for greater clearness the parts which here are not necessary, havebeen.

Fig. l shows diagrammatically the arrangement of the new key and typebar system in longitudinal section through the middle of a machine and shows a typebar in the striking position in dotted lines.

Fig. 2 shows in detail the arrangement of one of the outside type-levers together with its coupling lever.

Fig. 3 shows on the left half a section through thel typebars with a view of the segment for the coupling levers and typebars, the right half shows a view of the cushion ,for the Vtypebars with the typebar segment behind, and simultaneously a section lthrough ,the coupling lever segment withl the raised shank of the coupling lever.

Fig. 4L is a diagrammatic plan from above of the Aangle-lever with its segment and spring mechanism. 4

The frame casing a; of the machine may be made and arranged in the mannerY already set forth in the principal U. S. Pat. Appl. Upon the back wall is angle frame o. The key-heads are marked al and the return rod for release of the control and speedy return of the typebar to its cushion is marked e.

In front of the paper cylinder is located vertically the typebar segment f, in which the typebars g are mounted upon a common spindle it. Each typebar g rests in inoperative position with its head'upon a cushion z'. Beneath the typebar segment f a coupling member lc is located and attached radially to the middle point of the typebar segment. TheV coupling levers m mounted upon a com'- mon pivot rod Z each engage by means of lateral pin m1 in a slot g1 of their particular i Fig. 2 beta.

typebars g. This slot g1 terminates in a curved end g2 of special formation.

In order, in spite of the greatnumber of typebars and their short length and also the small proportions of the typebar segment, to obtain enough space for the type upon the cushion of the supporting hoop without making the distance of the outer segmentV slots and the angle taken up by the typebars much larger than with large office machines,

the outermost typeb'ars are vspaced further apart or bent laterally in the position of rest with relation to the more central typebars. The outermost typebars thus traverse upon the way from the cushion e' to the striking position on the paper cylinder a longer path than the inner ones. Also the couplinglevers m located lin a circle round the typebars are proportioned considerably smaller between their pivotal points and the points of engagement in the slots g1 oi` the typebars than similarly arranged cou-pling levers of the larger machines. On account of the greater spacing between the outer typebars g, and of the small `length of the coupling levers m a different angle Aof the coupling levers m the slot g" ofthe typebars arises with the outer typebars. This continual-ly decreasing angle towards the outer typebars influences, however, compared with the central typebars, the rapidity of action Aof the saidfouter typebars, and also the strength of the touch on the keys and the depression ofthe keys. In order to overe come this disadvantage, that is lto say, so as to keep the 'angular` relation of the coupling levers m to their'engagingsurfaces in the `slots of the typebars approximately in the same angle radius, the ends of the slots are curved in a special manner.

Figs. l and 2 will explain this. The iirst ligure shows the position of engagement of the coupling lever with a central typeba'r;

the detail ligure according to Fig. 2 shows.

the position of the coupling lever at the point or" engagement for an outer typebar.

It is easily seen from these two figures, how the angular position of the typebar slot g1 to the pivotal point Vvol? the typebary chances with the outer typebar, which is placed further over, and accordingly the angular position of the coupling lever m in the slot of the typebar is different also.

In F ig. l the angle between Vthe working slot g1 of the typeb'ar and the middle line of the Vcoupling lever is marked alpha, and in W'ith the outermost typ'ebar shown in F ig. 2 the coupling lever is placed further back, since it has the same length Vas that 1in' the middle of Fig. l and the angu* lar position of the slots is the same with all 44C typ'ebars. With no curved construction ofthe typebar slot the angle beta would become very much smaller in relation 'to the angle alpha of the middle lever. The enlgaging surface of the guiding pin m1 of the coupling lever m in the slot g1 would be too flat and it would cause the above-mentioned disadvantages. -The curve of the typebar slot is therefore so made, that the angle of engagement of the coupling` lever in the'slot of the typebar remains the same or approximately the same with all type bars.

The machine is of very small dimensions,

not only in heightbut also in length. Theiirst row of keys is arranged as near as possible to the cushion 'i for the typebars. Since the limited space makes the employment of continuous key-levers, as commonly used With large machines, impossible, a key-lever 1n several parte provided, consisting of a key-rod andan angle-lcv r, the latter bev ing connected to the couplingV lever by means of a rod. The. key-,rod r, winch passes through the slo'L in a guide-plate s,

Ais connected at its lower end with an angle levers. ln order not to increase Vthe lheight oi" the machine thus established owing to the forward movement of the extensions coupled to the key-rods when the keys are depressed, the angular positions of the front extensions 01, are again so arranged, that l the latter on depression do not descend :be-

yond the deepest point of their pivotal axes al. Since this extension of the angle lever does not turn about its own middle pivotal point and also, particularly with the first row of keys, takes up a considerably `acute angular position upwards, it moves forwards through a large arc. The yanglelevers 0 Yfor all the rows of keys are arranged upon a spindle al. The front extension of the second, third and fourth row of keys iseacn successively longer `than the former on account of the distance from one rov'voi.

keys to the next row of keys,and therefore the Voutward movement of lthe angle-levers,

chines, and especially with those of small dimensions, is thus completely obviated.

Beneath the typebar cushion z' the anglelever segment a is arranged. All the anglelevers o for all four rows of keys are mounted upon the spindle al. The levers o are pressed with their front extensions against the striking cushion g, by means of springs p, which are secured on the one hand to the noses o3 of the levers and on the other to the noses a stamped out of the sheet metal forming the angle-lever segment.

The key-rods r are connected to the anglelever extensions 01. The former pass, as already described, through apertures in a guide-plate s formed in steps. Since the longest extension 01 of the angle-lever engages with the shortest rod r and the shortest extension 01 with the longest rod r, and the relation of the steps of the guide-plate for the key-rods to the length of the anglelever extension o1 is approximately proportional, the key-heads describe an almost perpendicular path downwards and the scarcely perceptible forward movement is the same for all.

Fig. 3 shows on the right hand a section through the angle-lever segment n looking on the raised extension o2 of the angle-lever. As will be seen, the extensions of the outer angle-levers are longer than those of the inner ones. The result is thus secured, that the direction of pull of the connecting rods t from the coupling levers to the anglelevers is not too oblique or slanting on account of the short distance between the angle-lever segment and the coupling lever segment.

rIhe much altered conditions of connection and transmission for the several systems are again compensated by means of the displacement of the point of engagement of the rod t with the coupling lever m. The length of the rod t is rendered adjustable by the insertion of a threaded coupling. Since the forces, which arise on driving the coupling lever by means of pressing down the key-head, work in opposite directions to one another for the coupling and angle-lever segments (see the arrows in F ig. l) the two segments are stiffened in the middle or" the machine by a stay to.

I claim 1. A typewriter having in combination on a frame, a slidable carriage and roller in the rear part of the said frame, a key board with rows of keys and corresponding key rods at the front of said frame, the length of the key rods decreasing in length from row to row towards the front of the frame, a stepped guide plate for the key rods, pivoted typebars adapted to swing upwardl1y for printing and arranged in a circular, substantially vertical sector, coupled levers pivotally mounted in a segment lying con,-

centrically' to the typebari'sector, coupling means between the'typebars andthe coupling levers, angle levers pivotally arranged on a commonA spindle and comprising sub-f stantially forwardly' directed extensions of different lengths and substantially upwardly directed extensions of diierentheiglits, the shortestof said forwardly directed extensions being connected to the longest of the said key rods and progressively the longest of such extensions being connected to the shortest of the key rods and connect'- ing rods connecting said upwardly directed extensions to the said coupling levers.

2. In a typewriter in connection with a key board with rows of stepped key rods, angle levers pivotally arranged on a coinmon spindle and comprising substantially forwardly directed extensions ot different lengths and substantially upwardly directed extensions of diierent heights, the shortest oli said forwardly directed extensions being connected to the longest of the said stepped key rods and progressively the longest of said extensions being connected to the shortest of the said stepper key rods, connecting rods connected at one end to the said upwardly directed extensions of the said angle levers, coupling levers connected to the other ends of said connecting rods, pivoted type bars adapted to be swung upward for printing, curved slots in said type bars and pins on said coupling levers engaging said slots, the different heights of the said upwardly directed extensions of the angle levers being compensated by a corresponding displacement of the connecting points between the connecting rods and the coupling levers.

3. In a typewriter in connection with a key board with rows of key rods, spring actuated angle levers pivotally connected at one end to the said key rods, a striking cushion for the same, connecting r'ods connected with one end to the other end of said angle levers, coupling levers connected to the other end of said connecting rods, pivoted typebars adapted to be swung upward for printing and arranged in a circular substantially vertical sector, the outer typebars being spaced further apart, slots in the lower ends of said type bars and pins on the adjacent ends of the coupling levers engaging said slots, the ends of the said slots being curved to compensate the altered angular position of the coupling lever to the typebars in the outer typebars which are spaced further apart.

t. In a typewriter a printing mechanism comprising pivoted typebars adapted to be` swung upward for printing, coupling levers, operatively connected thereto and being pivotally arranged on a common spindle, a coupling lever segment, a key board with rows of key rods, spring actuated angle levers pivotally connected to the key rods,

a common spindle and a segment for the angle levers, connecting rods between the coupling levers and the angle levers and a y stay between the coupling lever segment and ,the angle lever segment.

5. In a typewriter a printing mechanism comprising pivoted typebars adapted to be swung upward for printing, coupling levers operatively f connected thereto and being pivotally arranged on a common spindle, a coupling lever segment, a key board with rows of key rods, spring actuated angle levers pivotally connected to the key rods, a common spindle and a segment for the angle levers, connecting rods between the coup ling levers and the angle levers and a stay between the coupling lever segment and the angle lever segment which stay comprises two parts which are connected by screws in such a manner that the length of the stay can be regulated.

In testimony whereof I aix my signature.

ADOLF FRITZ SCI-IAUSS.