US1730456A - Typewriting machine - Google Patents

Description

Oct. 8, 1929. 5. G. some TYPE WR'ITING MACHINE Filed Dec. 27, 1927- INVENTOR I :9M-97h Q Q g WITNESSES I I ATTORNEY Patented Oct. 8, 1929 UNITED STATES PATENT OFFICE GEORGE G. GOING, OF MIDDLETOWN, CONNECTICUT, ASSIGNOR TO REMINGTON TYPE- WBITER COMPANY, OF ILION, NEW YORK, A CORPORATION OF NEW YORK TYPEWRITING MACHINE Application filed December 27, 1927. Serial No. 242,799.

This invention relates to typewriting machines which have pivoted typebars and to improvements in such typebars and the mechanism by which the typebars are operated. The main object of the invention is to render the typebars of either a large or a small machine noiseless, or much less noisy than pivoted typebars commonly are, but an additional object is the production of a noiseless or approximately noiseless system of typebars suitable for use in such small machines as those which are called portable typewrit ing machines.

Several inventions more or less closely resembling this have been made by me, and one of them is described and claimed in an application for patent, which was filed December 27th, 1927, and bears the Serial No. 242,800, Some claims of that applicationapply also to mechanism shown and described herein, but.

the claims of this application are so limited as to make them distinguish the invention which they cover from that claimed in the above-mentioned prior application. The present invention consists of combinations in which a typebar, actuating mechanism, and a device somewhat resembling a governor and called herein a typebar-silencer are elements, and which combinations are particularly described herein and defined in the claims of the ap lication.

' tionof a typebar-silencer;

Fig. 3 a side View of a plate which is a portion of that silencer;

Fig. 4 a plan of the typebar-silencer;

Fig. 5 a side view of portions of a typebar and the typebar-silencer, the typebar being in a position indicated by broken lines in Fig. 1; and

Fig. 6 a side View of those portions, the typebar being in its printing position.

The drawings are full-size views of the mechanism which they represent and which is a portion of a small or portable machine. The two typebars 1 and 11 are mounted on the arcuate pivot-wire 21, the former being about midway between the ends and the latter near the right end of the wire and they fit loosely in kerfs 64 cut in the wire-supporting segment 22. The typebars 1 and 11 in clude the typeblocks 2 and 12, and type 3 and 13, respectively, and the typeblocks lie on the typebar-rest 23 when the bars are in their normal positions. The printing position of a bar is that which it takes when one "of its type makes contact with the platen 24 at the printing point 25. The angular movement of each bar is 90 or thereabouts, but might be more, and the relation of the segment to the platen might be such as' to make the printing point higher or lower on the platen than where it is represented in Fig. 1 of the drawings. Of course the machine includes means for enabling the platen and segment to be relatively shifted so that either type of each typebar may be'swung to the platen at the printing point. The pivot-wire 21 passes throu h the base 4 of typebar 1 and base 14 of typebar 11, and the base of every other typebar of the system. On the base of typebar 1 are the perforated lug 5 and the surface or edge 6, and, on the body of the bar is the long arm 7 which extends from the back thereof near the base and has on it a series of rack teeth 8, the inner end 9 of the series being at the inner end of the arm and the outer end 10 of the series at the outer end of the arm. On the base of typebar 11 is the lug 15 (indicated by dotted line, Fig. 1 and the surface or edge 16, and on the ody of this bar is the arm 17 on which is'the series of rack teeth 18, the inner end 19 and outer end 20 of this series being at the inner and outer ends of the arm respectively. Of course typebar 11 is bent near the typeblock 12 more than bar 1 is near the typeblock 2, and the type on block 12 differ from the type on block 2 in respect of the characters formed on them, but in all It is to be understood that by back of the bar or back of the body of the bar is meant the side or edge which is opposite to the side .or edge from which the type project and which is the front of the bar.

The illustrated actuating mechanism of each of the above described typebars comprises a keylever, a sublever and a link, but it will be evident to those skilled in the art that some other form of numerous wellknown forms of typebar-actuating mecha nism might be substituted for that shown and particularly described 'herein, and which is more fully disclosed in my prior application, Sr. No. 232,582 filed Nov. 11, 1927.

The keylever 26, 27, 28, sublever 29,30 and link 31, these levers being connected together by the pivot pin 32,- spring 33 connecting arm 29 of the sublever to the fixed plate 61 and tending to draw the arm backward, the portion 60 of the sublever normally bearing on the fixed cross bar 34, and the. arm 29 being connected to lug 5 of typebar 1 by the link, form the actuating mechanismby which that typebar is swung from its normal position towards and nearly to its printing position. The keylever and link 35, comprised in the actuating mechanism of typebar 11, are exactly like the'described keylever and link 31 respectively, but the arms 36 and 62 of the sublever which is connected to typebar 11.are longer respectively than arms 29- and'30 of the othersublever, and arm 36 is bent inward below its upper end so that the inwardly bent portion is in alignment with the lug 15. The keylever and sublever of typebar 11 are connected together by the pivot pin 63 and arm 36 of this sublever is connected by a spring like 33 to the plate-61, and a portion of this sublever like the portion 60 ofthe other sublever bears on the cross bar 34. Both keylevers, and the other keylevers of the machine which are connected to typebars, are loosely mounted at their rear ends on the fixed cross rod 37, and extend through the comb plate 38 and are normally held by springs 33 and others like it in contactwith the cross bar 39. The stop bar 40 passingunder the keylevers and fastened to thiscombpla'te limits These devices are mounted on the arcuate 'pivot rod 43 which is supported by the arms and construction of these devices, may be varied but those of the oblong device shown and described are the preferred form and construction. Each silencer is composed of the rack 46 (Fig. 2) and a pair of side plates permanently fastened together by rivets 65 l or otherwise, the rack, comprising the series of teeth 47, being between the side plates.

The plate 48 (Fig. 3) is one of the plates of this pair, and the other, 49, is a duplicate of it. In the plan (Fig.4) of this silencer, I the upper edges of both side plates, and that I of rack 46 are shown. The pitchline of this rack is equal in length to that of the rack on the typebar. The rod 43 passes through the pivot hole 50 of each silencer. This hole is near the middle of the device and near the inner end of the rack and passes through the rack and both side plates. The side plates extend beyond the inner end of the rack and form the end or edge 51 of the device, which end or edge is on the opposite side ofhole 50 I from the end or edge that is formed by the side plates and outerend of the rack. The portions 52 and 53 of the side plates form side walls of the space 54 that extends from end or edge 51 of the device to the inner-end of the "rack and these portions are wider near their outer ends than'they are near the rack.

The keyhead or keycap of a keylever.prop- 1 erly operated is depressed-quickly and far enough to force the lever to strike the stop bar 40. As the keyhead 28 of typebar 1 for example starts to descend, the t pebar is pushed by link 31 from its norma position towards its printing position and the typebar-silencer is turned by toothed arm or rack 7 acting on rack 46 and its motion is progressively accelerated. The force exerted on the keylever continues to actuate the typebar until the'bar reaches the position indicated in Fig. 1 by the dotted lines at w, whereupon the/keylever is arrested by the stop bar 40. Then the silencer and rack 7 have reached the positions shown in Fig, 5. During the movement of the typebar as it approaches the position indicated at m, Fig. 1, the re-action of the silencer on the typebar so retards the latter that it moves much more slowly when.

it gets to position w than it did in the preceding portion of its swinging movement, arm

7 of the typebar meanwhile passing between the side plates of the silencer into the space '54. The typebar is driven from position a;

to the printing position, indicated by the. v j

dotted lines at y, Fig. 1, by the silencer actuated by its own momentum and turning from the position shown in Fig. 5 to that shown in Fig. 6, but this portion of the movement of the typebar is quite slow and the action of the typebar is not noisy when the type reaches the platen. Nevertheless the type is pressed firmly against the inking ribbon and platen by the silencer when its momentum is suddenly terminated by the unyielding resistance of the platen, and of course the silencer is arrested by the typebar acting on the platen. As the typeb-ar swings from position a: to position y it draws link 31 and arm 29 of the sublever forward a little and slightly raises the portion 60 of the sublever from the crossbar 34. It is to enable this to be done that the link and sublever are made movable with the typebar to a slight extent after the keylever has been arrested or while the keylever is inactive. Of course the same eliect might be obtained by means of a lostmotion connection at either end of link 31 or somewhere else between the keylever and the typebar,

The typebar and devices comprising the actuating mechanism are restored to their normal positions'by the action of spring 33 which is stretched When the key or keyhead is depressed, and as the typebar moves backward the silencer is' restored to its normal position, shown in Fig. 1, and is arrested by the typebar when the latter reaches the typebar-rest, and thereafter it remains in that position until typebar 1 is again operated.

The actuation of typebar 11, or that of any of the other typebars of the system, by means of its actuating mechanism and silencer, is

like that of typebar 1 and will be fully understood it is believed from the foregoing de- 'scription.

Various changes may be made without departing from my invention.

What I claim as new and desire to secureby Letters Patent, is

1. The combination. of a pivoted typebar' in which is included an arm springing at its inner end from the back ofzthe bar near its base and having on it a series of rack teeth that extends from end to end of the arm, actuating mechanism connected to the typebar, and a pivotally mounted typebar controlling member comprising a rack which meshes with that on the typebar and through which the force that actuates the controlling memher is transmitted to it from the typebar, the controlling member and t pebar being permanently geared together y the racks.

2. The combination of a. pivoted typebar in which is included an arm'springing at itsinner end from the back of the bar near its base and having on it a series of rack teeth that extends from end to end' of the arm, actuating mechanism connected to the type- .bar, and a pivotally mounted typebar'con its inner end from the back of the bar near its base and having on it a series of. rack teeththat extends from end to end of the arm, actuating mechanism connected to the typebar, a stop that arrests the action of said mechanism before the typebar reaches its printing position, and a pivotally mounted typebar-silencer comprising a rack which meshes with that on the typebar and through which the force that actuates the silencer is transmitted to it from the typebar, the silencer and typebar being permanently geared together by the racks.

4. The combination of a pivoted typebar inwhich is included an arm springing at its inner end from the back of the bar near its base and having on it a series of rack teeth that extends from end to end of the arm. actuating mechanism connected to the typebar, a stop that arrests the action of said mechanism before the typebar reaches the printing position, and a pivotally parts motion to the silencer is transmitted to it from the typebar.

5. The combination-of a typebar in which is included a rack, actuating mechanism com nected to the typebar, and a pivotally mounted controlling member comprising a rackwhich meshes with that on the typebar and through which rack the force that actuates the controlling member is transmitted to'it from the typebar and the controlling memher is arrested by the typebar at each end of that members movement.

'Signed at Middletown, in the county of Middlesex and State, of Connecticut, 'this 22nd day of December. A. D. 1927.

GEORGE G. GOING.

trolling member comprising a curved rack v the pitchline of which is equalin' length to that of the rack on the tebar and is near

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