US1460847A - Typewriting machine - Google Patents

Description

July 3, 1923a f? E. B. HEss TYPEWRITING MACHINE Filed sem. 2o. 1921 connected therewith.

Patented t.liuibv 3, 195m UNITED sra..

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Application filed September 20, 199A.

To all co from t muy concer/a lle it known that l, lilnwnun l. lines, a citizen oi` the United titates residing at lvlanhattan iieach, in the coun-ty of Kings, New Yorlr, and State ot New "York, have invented certain new and useiul improvements in; Typewriting ll/lachines, of which the following is a specilication.

This inveirtion. relates particularly to type actions 'lor' typewriting machines and esp4 ciali-y to that cl olf.,type actions in which the type bars are actuated by the liey levers through other levers:interposed between the hey levers and the type bars and operatively lin one form oli such type actions the interposed levers are in the torni oli bel`lg-cranh or two armed levers and they are connected; with the rear portions ci the keylevers and with the rear ends" or heels of the type bars. The construction in. such type actions is such that when the heya are depressed the type bars are rapidly moved :from positions ot rest directly and without inte]'ruption` to the printing point on the platen; ln such machines the type bars strike the platen with considerable 'torce and. objectionable noise is produced which, according to my invention, is greatly de creased. In my U. S. Patent No. 1,390,708 ot September 13, 192i, I have shown type actions in which provision is made 'for reducing the noise made by the impact of the type bars onthe platen and therefore l do not herein; claim broadly type actions which are so constructed as to reduce such noises, but acording' to my present invention such broader invention is adapted to mechanism of somewhat dilierent construction troni that shown in such patent. i

In. machines ot the character before described, it is common to actuate the escape'- ment mechanism by the type bars which. operate directly upon the imiversal bar mechanism, while the type bars are being moved rapidly ltoward the platen. i-lrccordinp' to one part oli my present invention the escape ment is not operated d urin fr the initial por` tion of the movement oli the type bars, but is operated during the latter part thereof during what isicalled'in my prior patent the momentum period, it being;1 understood that the type bars are moved by a Ylull depression of the keys to a point considerably in advance o'l the `platemthe further movement of the type bars to the platen being serial ne. 501,593.

depression ot' a key the associated type bar is moved only 11o a position considerably in advance ot the platen ali'id the type bar is moved to the printing` point bythe momeupum of the type bar during which period the linger ofthe operator is usually on the key and the key makes a slight return movement which is resisted by the linger oli the iipcrator. lt will further be understood that when the key is fully depressed certainl parts oit the mechanism interposed; between the key levers and the type bars assume a tonle-loclrinzcr or dead-center position which is an important iieature of the coiiistruction.

i In the accompanying drawings, y

.Figure l is a view, largely diagrammatic, olf portions olf a typewriting machine embodying` my improvements, some parts beingl shown in side elevation andsome in section and the position et some parts being slightly eieiggerated i'for purposes of illustration;

`Fig'. 2 is a detail view illustrating` the link connection between the heel of a type bar and the upper end of a bell-crank lever interposed between the type bar and a key lever. This ligure ot the drawing shows the parts in dead-center or toggledocking position when the pivot points at oppositev ends o'l the link are in a` straight line with the pivot of the type bar. This ligure also shows how the heel oi the type bar makes` contact* with the universal bar at the commencement ol" the momentum period. i

l? 3 is a view similar to Fig; 2, but illuf5`` trates the positions of the parts after they have passed the dead-center position during the momentum period, and this ligure oi' the drawing also shows how the type bars en- `rage the universalbar mechanism `and operate it during` the momentum period. y

iin .Figure l of the drawings parts ot a typewriter carriage are indicated at rl,and B indicates a platen. C indicates a type bar segment, D `a type bar guide and E parts of a ribbon guide. Escapement mechanism is indicated at l?, a key lever at Gr and a type bar at l-l. The type bars normally lie horisoi zontally, their rear ends being pivoted to the segment at c and their' front ends being supported by a cushioned rest I. The rear ends of the key levers are pivoted at z' to a support J` and the'upward movement of the front portions of the key levers is arrested by a cushioned stop K. Each type bar H is formed with a heel having a rear ortion h, which is connected by a spring with a spring support M and the heel of each type bar is formed with a cammed edge 7L so shaped as to properly operate the universal barfmechanism,as hereinafter described. It will be observed that the pivots c of the type bars are arranged in rear of the front face of the segmentvand in fact within the body of the segment, being thus largely protected from dust, while the segment is so formed as to permit the heels of the type bars to operate freely during their excursion toward and from the platen. The springs L serve to return the type bars to their horizontal position of rest and to prevent vibration. y

Each type bar is operated by devices inter posed between it and an associated key lever, such devices being located immediately below the pivots of the type bars. These devices comprise a two-armed lever N and a link O. Each interposed lever N is pivoted at 0 to the support J and its shorter arm is connected to the associated key lever by a slot and pin connection o', while the longer arm of the lever is connected to the heel of the associated type bar by the link O. The pivots 0 of the levers are in substantially the same vertical plane as. the pivots of the type bars. The links O have pivotal connections at their opposite ends with the levers N and the heels of the type bars and when the parts are in normal position the connections between the links and type bars are considerably in rear of the pivots of the type bars and at that time the angle between each lever N 'and each link O is substantially a right angle so that when a lever N is operated there is a direct pull on the type bar during the initial movement of the key lever. At this time also the angle between a link and the associated type bar is approximately 450.

The escapement mechanism is of substantially the same construction as that employed on the Royal Standard machines. The rocker plate R carries an arm i", equipped with a roller 1"', and this roller bears against an arm s of the universal bar mechanism, which latter is operated by the type bars. The universal bar mechanism comprises a frame S, pivoted at tto arms t', projecting downwards from a horizontally arranged shaft T. At its front end the frame carries a semi-circular part U with which the heels of the type bars engage during their excursion to the platen and the forwardpart of the frame S also carries aguide finger u, projecting through the segment C. A spring o attached to the rocker plate R and to the arm t serves to hold the universal bar mechanism in forward position and to return it to such position after being moved rearwardly. The forward movement of the universal bar mechanism is limited by an adjustable screw V.

Normally the heels of the type bar are out of contact with the universal bar, but as soon as the type bars reach the position shown at X in Fig. l, when the momentum period of the type bars commence at such time or thereafter, the cammed edges l1. of the bars engage the universal bar, move it rearwardly and operate the escapement.

l/Vhen a key lever is depressed to its full extent, as indicated by dotted lines in Fig. 1, the interposed lever N, the link 0 and the type bar H are moved to the position shown by dotted lines in Fig. 1, the type bar being` moved to a position indicated by dotted lines at X. When thus moved it will be observed by reference to Fig. 1 and also to Fig. 2 that the pivot points y, y. at opposite ends of the link t) are in a direct line with the pivot c of the type bar, in other words in a dead-center or togglelocking position, and there is no further downward movement of the key lever. Then in this position the type bar occupies the position shown at X. Its further move ment to the platen is caused by the momentum of the type bar and not by the depression of the key lever, which latter. in fact. is never depressed further, but during the momentum period has a slight rising movement which is resisted to some extent by the finger of' the operator. llxlicrience has demonstrated that by this construction and this operation the noise caused by impact of the type on the platen is very greatly rcduced, and furthermore the universal bar is operated only during the momentum period of the type bars.

It will be observed that the arm .e ol the universal bar mechanism is never out ot' contact with the eseapement mechanism and thus noise which would otherwise be produced by the strikingof the arm against the roller of the escapement mechanism is prevented.

The part .I serves to support both the key levers and the interposed levers and the construction is such as to cover theI pivots of the key levers.

Thile I have particularly described certain details of construct-ion shown in the accompanying drawings, it will be understood that I have shown only one way of embodying my improvements and many of the details of construction. shown may be varied.

I claim as my invention:

1. In a typcwriting machine the combination with the key levers and type bars ot levers `interposed between the rear portions of the 4key levers and the rear portions of: the type bars which are operatively `connected with the key levers and have link connections with thetype bars in the rear of their pivots, the points oi` connections ot each link with its type bar and interposed lever being so related that a i'ull depression ofthe key lever moves them into a straight line with the type bar pivot, thetype bar then being at a considerable distance from the platen and `completing its movement by its own momentum.

2. In a typewriting machine the combination with the key levers and type bars ot two-armed levers interposed between the rear portions oi the key levers and the rear portions of the type bars and which have their shorter arms operatively connected with the key levers and the longer arms oli' which have link connections with the type bars in the rear of the type bar pivots, the points of connection of each link with its type bar and interposed level' being so related that a full `depression of the key lever moves them into a straight line with the type bar pivot, the type bar then being at a considerable distance from the platen and completing its movement by its own momentum.

3. In a typewriting machine the combination with the key levers and the type bars ot levers interposed between the rear portions of the key levers and the rear portions of the type bars and which have tog gle connections with the type bars, the vpoints ot connection of the toggles `with the type bars and with the key levers being so related that each type bar is moved by the full depression of a key to a toggle-locking position in front of the platen and at such distance therefrom as to reduce noise during the further movement of a type bar about its pivot to the platen caused by the momentum oit the type bar.

fi. In a typewriting machine the combination with the key levers and the type bars of two-armed levers interposed between the rear portions ol the key levers and the type bars which are operatively connected with the key levers and have link connections with thetype bars in rear ot and below the type bar pivots, the points of connection of the links with the interposed levers and the type bars being so related that each type bar is moved by the full depression of a key to a dead-center position in trent ot the platen and at such distance therefrom as to reduce noise during the further movement o'lI the type bar about its pivot to the platen caused by the momentum of the type bar.

5. ln a typewriting machine the combination with lthe key levers and the tyipe bars, oi levers interposed between the rear portions ot the key levers and the rear por tions of the type bars which are `operatively connected with the key levers andihave link connections with the type bars in the. rear ci? their pivots, the points ot connection o'leafch link with its type bar andinterlgiosed lever being so related that aflull depression ot the key lever moves them into a straight line with the type bar pivot, esca-pement mechanisin, and universal bar mechanism in con-` stant engagement therewith and first engaged by the type bars when ythe key lever is fully! depressed and operated by the type bar during its travel by momentun'i to the printing point.

6. ln a typewriting machine the combination with the key levers and the type bars of levers interposed between the rear portions of the type bars and the rear portions of the key levers, and which have toggle connections Witli the type bars, the points of connections ot the toggles with the type bars and with the key levers being so related that each type bar is moved by the tull depression of key to a toggle locking position in :front ot the platen and at such distance therefrom as 'to reduce noise during the fun ther movement ot' a tylpe bar about its pivot to the platen. caused by the momentum oil the type bar, escapement mechanism, and universal bar mechanism in constant engagement therewith and engaged by type bar only at the full depression ci the key and moved to operate the escapement mechanisnr during `said momentum movement oil the type bar.

7. ln a typewriting machine the combination with the key levers and type bars both o'l which lie in substantially horizontal planes, oit two-armed levers interposed between the type bars and the keyl levers and operatively connected with the key levers, and links extending forwardly trom the type bars at an acute angle thereto and connected to the upper endsot the two-armed levers, the points et' connection oi' each link with its type bar and interposed lever being so related that a lull depression ot the key lever moves them into a straight line with the type bar pivot, the type bar then being at a considerable distance 'from the platen and completing its movement. by its own momentum.

8. ln a typewriting machine the combination with the key levers and type bars both of which lie in substantially horizontal planes, ot two-armed levers interposed between the type bars and the key| levers and having their lower and shorter arms connected to rthe key levers, and links extending at an acute angle to the type bars and connected tothe longer arms ot the interposed levers, the points ot connection ot each link with its type bar being so related that a full depression ot the key lever moves them into a straight line with the type bar pivot, While thelnk extends at anobtuse angle to the ytype bar, the type bar then being at a con- '9. In a visible Writing machine the com.

bination Withkey levershaving their finger pieces near ythe front'of 'the machine and type bars whose free ends lie-toward the front; ofthemaehine, of intermediate two armed levers, the short arm of eaeh twoarmed lever being operatively Connected to the key lever intermediate its length, and

n a link connection extending forwardly from the heel of each type bar and operatively Connected to the upper and longer arm ot the two-armed lever, the Connection ofthe link to the lever andthe link itself moving into a straight line with the type bar pivot upon a. full depression of the key lever. the type bar then being at a considerable distance from the platen and completing its movement by its own momentum.

In testimony Whereotl l have hereunto subscribed my name.

EDWARD B. HE MS.

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