US915015A - Type-writing machine. - Google Patents

Description

A. T. BROWN.

` TYPE WRITING MACHINE. APPLICATION FILED ooT. 21, 1904.

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' HIS ATTURNEY WITNEESEE:

Patented Mar. 9, 1909.

1 A. T. BROWN.l 'TYPEAWBITING MACHINE., I v APPLIQATIOF FILED-00T. 21, '1904.

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HIE. ATTDRNQ A. T. BROWN. TYPE .WRITING MACHINE.

APPLIUATION FILED 00T. 21, 1904.

Patented Mar. 9, 1909. 8 SHEETS-SHEET 3.

INVENTUH:

` feed mechanism of such machines and 1t conforth herein and cured by as ALEXANDER T. BROWN, SYRACSE, NEW YORK.

TYPE-WRITING MACHINE.

Specification of Letters Patent.

Patented Maren le, 190e.

Original applicationled June 29,1904, Serial No. 214,625. Divided and this application filed October-.21, 1904.

Serial No.

of Syracuse, in the county of Onondaga and State of New York, have invented certain new and useful Improvements in Type-Writing Machines, of which the -followlng is a speciiication. l

My invention .relates to typewriting machines and more especially .to the carriage sists in certain featuresof construction and combina-tions of parts -which will be fully set particularlyI pointed out in the claims. 1 The present casel is a division of my priorl application Serial No. 214,625, iiled June 29, 1904.

One embodiment of my inventionis illus- Vtrated in the accompanying drawings, in

whichi l Figurel is a longitudinal sectional view of a typewriting machine; Fi 2 is a sectional view through the epicycloi al train f the cs- I capement mechanism; Fig. 3 is `a rear elevation oi' the machine Fig. 4 is a detail view showing a portion of the carriage feed mechanism as seenfrom the rear, including aldevice for feeding the carriage toward the right; Fig. is a detail view of the backspacing'mechanism; and Figs.v 6, 7, 8 and 9 are detail views of the escapement mechanism.

I have illustrated my invention as' applied to a iront-strike typewriterfbut many of the features thereof are also applicable to other sorts of typewriters. The base ortion oi l the main frame of the machinel ere illustrated comprisesside plates 1, aback plate 2', a shelf 3 and a transverse partition 4.v Posts 5 rising from the said base portion support a top plate` 6 upon which the carriage is mounted.l The keys 7 have their stems piv- .oted t'o arms 8 projecting fromrock shafts 9, which are journaled at 'their forward ends'in frame plates'` 10 and at their rear ends in the partition 4. Eachof said'rock shafts carries an` 3.11m 11, whichisconnectedb -a link 12 tov one arm 13 of .a three. armed su -lever,

another` arm 14 of which is connected by a link 15 to atype bar 16 which carries at its-.t outerrend` two types 17 and 18. The'suly leversare pivoted 1n hangers 19 which are sei 'screws' 20 to a iixed segment 21 whichis rigidly mounted in the main frame.

The4 typeoars 16 are journaled by ball bearings on a segment 22, which is supported by arms 23 for an up and-down case shift motion.

The mechanism thus far described is not claimed herein, as such mechanism forms the subject-matter of otherapplications of mine` co ending herewith. p

he carriage is mounted on, and is supported solely-by, .a single rail 24 which lies at on the top plate 6- and has race-Ways formed in its front and rear edges respectively. The carriage comprises two end pieces 25, ,which are connected together by ongitudinall which have ormed therein race-ways which coperate With the race-ways in the rail 6 to receive anti-friction balls or `rollers 28. The carriage is thus mounted on ball bearings for travel transversely ofthe machine.

extending bars 26 and 27 The end pieces 25 extend, toward the front of the machine and` have journaled therein .the l shaft29 of a platen 30. The rail 24 may be detachably secured tothe main frame, so that said 'rail and carriage may be removed together from the machine.

A rack bar 3l is secured to the yunderside of the carriage railv26 and said rack bar is in mesh with'two gear Wheelsy 32 and 33 which are mounted side by side on a-shaft 34 and extend throu h slots formed ,for the purpose in the to p ate 6 and rail 24. .The gear Wheel33- as fixed to one face thereof a spring drum 35 in which is coiled aspring 36, the outerend of which is secured to said spring drum and the inner end of which is secured to the shaft 34, on which the spring drum 35,

is journaled. The shaft 34 is-journaledin two Vvertical frame pieces 3.7 and 38, which they are secured. The tension of the spring 36-may be regulated by means of a ratchet "Wheel 39 which is controlled in the usual the ear wheel 32. The gear. wheel 32 is loos y mounted on the hub of the gear wheely 33 but the freedornci motion of one of these. Wheels relatively to the other is fare rigidly mounted on the shelf 3, to which step feed of the carriage is controlled by an 4escapement mechanism which 1s gearedto limited by a screw or fpin 41 (Fig. .5) which is secured to one of.sai gear Wheels and projects into an opening L12 in the. other, said opening being of greater diameter than the screw or pin, so as to admit of enough play to take up any lost motion that may exist between the teeth of said gear wheels and the teeth of the rack bar 31. lf the carriage is removed from the machine, this connection between the two wheels prevents relative rotation of 'such wheels, so that the main spring is controlled bythe escapement mechanism, Whether the carriage is in position ,on the machine or not. The gear wheel 32 meshes with a pinion 43 which is fixed on a e shaft 44 (Fig. 4) on which is rigidly mounted a squared block 45 (Figs. 1 and 2). Two beveled gears 46 and 47 are j ournaled on shouldered screws 48vwhich are threaded into. the block 45." These beveled gearsv mesh with beveled gears 49 and 50 which are journaled on the shaft 44, the whole con.- stituting a bevelear epicycloidal train. An escapement whee 51 is rigidly mounted on the hub of the bevel-gear 49, and a gear wheel 52 is rigidi f mounted on the hub of the bevel-gear 50.

As best shown in Fig.` 4, the gear wheel 52 vmeshes with a pinion 53 which is fixed on a shaft 54 which is journaled in the frame . plates 37 and 38. Said shaft 54 extends through the frame piece 38 and has Afixed on the end thereof in front of said frame piece a two-toothed escapement wheel 55. The construction is such thatl the shaft 44 is controlled by both of the escapement wheels 52 and 55, and said shaft is free to turn when either of said escapement wheels .is released,

and if both of said escapement wheels be released at the same time the shaft is free to turn through a distance equal to the sum of the distances permitted by the two cscapef ments separately. In the present instance the shaft 54 is eared to move'through three times the angu ar distance of the gear wheel 52, and the ratchet wheel 55 has two teeth while the ratchet wheel 51 has six teeth. This being the case, it will be perceived that the two escapement Wheels are designed to afford the same extent of feed movement to the carriage. The Aescapement wheel 55 is controlled by feed dogs which are connected with the universal bar so that said escapelnient wheel is under the control of the character ke s. The escapement wheel 51 is controlled by fe by the space key, so that when the last letter of a word is printed the key corresponding to such letter and the space key ma 1 be struck at the same time with the result that the carria e will be fed a double distance to space etween words. In Fig. 1 the shaft 54 is shown broken away a short distance behind the frame piece 38 in order tov show the mechanism mounted on the shaft 44.

The escapement wheel 51 is controlled by ed dogs which Vare operated pieces 37 and 38. The feed dog 56 is formed on, or consists of, one arm of a bell crank lever, the other arm 59 of which is connected by a'. link 60 to an arm 61 pro'ecting from a rock shaft 62 which is journaled at its rear end in theback plate and at its front end in one of the frame plates 10 and which is operated by a space key 63, thefstem of which is pivotedto an arm 64 projecting from said rock shaft. The dog 56 is normally out of the pathof the tooth of the escapement wheel 51, as shown in Fig. 3. The dog 57 extends substantially horizontally from the rod 58 and ynormally lies in engagement with one of the teeth'of' the eseapementwheel. This dog has an adjusting screw 'threaded through it, andthe lower end of said screw is in position t'o be engaged by an arm 66 integral with the dogl 56. The construction is suchA that when the space key 63 is depressed the dog 56 is thrown into the path of a tooth of the escapement wheel'and the dog 57 is lifted Aout of the path-'of the teeth of said wheel'by the arm 66 engaging the' screw '65. The amount of motion thus impartedto the dog 64 may be regulated byadjusting said'screw. When the key 63 is released the partsare returned to norinal'position, withdrawing the v dog 56 and permitting the dog 57 to drop into the path of the next'succeeding tooth ofv the esca ement wheel, by a spring 67 (Fig. 1) coiled a out the shaft 62 and connected at one end to the frame plate 10 and at the other g form of a stepped segment and it is mounted A .for parallel motion upand down; To this end two brackets 72 are secured to the universal bar near the ends thereof and each of said brackets has pivoted theretoat 73, an arm 74 which is rigidly connected toa rock ice shaft 75, which is journaled in brackets 76 of the top plate 6. A. bracket or arm 7 7 is" fixed to the universal bar near the middle thereof and said bracket is pivotally connected at 78 to a link 79 which is pivote'd at 80 to a bracket 'y 81 which is' rigidly secured to the fixed s e'g-l ment 21. The link 79- is ofthe same length as the arms 74 and is parallel to said'arms, so that said arms and link guide the universal bar for parallel motion. All ofthe sub-levers 13, 14 are mounted to swing in substantially vertical planes, and the universal' bar is ste ped on its under side, as shown in Fig. 3, an each of the arms 68 cooperates with one of the steps.

ln order to make the universal bar ligh and to avoid noise, I prefer to construct that part of sald universal bar which is engaged by the arms 68 of wood or other organic mal terial, and said universal bar is accordingly built up of two thin segmental plates 82 having a layer of Wood or similar'material interposed between them, the Whole being connected together by rivets 83 .(Fig., 3). Theorganic material projects beyond themetallic plates and has t e steps formed therein, as

Wheel 55 has its teeth pro'ectingfrom its front face substantially ara el to its axis of rotationI as shown-'in 'gs and-.18. Thef vmiddle portion ofthe nniversallbar'lies di-f rectly infront of this escapementywheel and'j the feed dogs9'1 and -92 are ymounted'- directly; on said universal bar; as best shoWninFigsff' 1 and 6. While any suitable feed' ,dogsinight be em loyed, yet II refer to use fthe? constructioni ustra'ted i'n-t e drawings, n -Which the `ece of sheet metal 93, which is secure'd.,.-as

y rivets 921, to the rear 'face ofthe universal bar. The loose dog 92 Ais pivoted ons. screw 95 which is threaded into an ear ofthe platev s 93. Said screw stands approximately over the shaft 61, so that lwhen the universal bar.

is reciprocated thejpivot of the .loose dog moves in adirection substantially toward and from the particular tooth of the escape# spring 97, the vother end of which is con-l nected to an ear 98 bent up from the plate.

mentivheel with which the feed dogs are cooperating at the time In the normal position of the parts shown in Fig. 6, the loose dog 9.2 is engaged by a tooth of the ratchet wheel, which presses it against a stop 96, which st op consists 'of an ear bentl up from the plate 93. The dog 92 extends a short distance above-its pivot where it is connected to one end '.of a light 93.` When the universal Vbar andthe feed dogs areraised by the depression of a key to their upper position, the 'spring 97 moves the loose-dog 92 to the position shown insaid Fig. 7, Aagainst a stop 99, which consists 'ofan ear bent up from the late 93. \When the carriage that a single letter` space move-1 ment of said carriage turns said escapement ythe key is released the toot of the escapement Wheel escapes past the fixed dog 91` and the next tooth-engages the loose dog 92. The escapernent Wheel being so geared to wheelthroughffhal of a com lete` rotation,

and a light't'ouc on saidlrey. is t erefore comparatively unimportant. 95.

`the pressureofthetooth of t e es capenient vWheel against the feed dogs is veryv light and, I consequentlyoffers a very slight frlctional resistance to the movement of the feed dogs, thuslessening `the Work thrown on the char? acter keys by theescapement. The escapef as the space key has no'fotherl work to'. o.

nentlwheel 51 is not geared up in thiswa thany that of. o erating said esca ement,

iixed dog 91 consistsof an ear bent up from a f 'Any 'suitab ave provided aback spacing -device for'- imparting to the, carriage a step-by-v'step movement toward the. right.

This device 4 I comprises a rock shaft 100 (Fig. 3), ywhich is mounted in the framework and is operated by a backispacing key in the same manner as' the rock shaft 62 by the space key. The

,shaftY '100' has an arm 101 rigidlysecured thereto, and said arm is connected by alin'k 102 with an/arm-IOSj-Which is mounted on a.-

rod or-"shaft1'04, 'which is mounted in the.

.10.3 is. drawn ldown by the depressiongfof* the hack-spacing key, the stop 107 ismoved away f rpm the pawl l105 vv hich dropsintol enf gagement with'one of the teeth of -thegear Wheel 32 and moves said gear -wheel back- Ward.l The pawl 105 has a tail 109,"vvhich,

at the jend ofthe-stroke of the pawl yenters the space between'two vof theteethof the gear wheel and stops the motion of allof 'the parts', thus positively reventing any overthrovi of the Wheel. lien the carriage is moved toward the right either by the backspacing mechanism just described or by hand, the escapeinent Wheel51 turns in a direction the reverse of that in .which it 'turns in the ordinary operation' of the machine, and the loose dog 57 acts as a pa'wl or detent and the Wheel 51 as a ratchet Wheel.

In order to prevent the escapement Wheel 55 from turning when the back spacing mechanism is,operated,the shaft 5 4 on which said escapement Wheel is mounted has fixed there on, ]ustbehindthe 'frame late 38, a two toothed 'ratchetfwh'eel 110 and a pawl or detent 111 pivoted to' lthe frameplate '38 at 112, is pressed into 'enfA Figs. 6 and. 8),-

gagement with said ratchet' vWheel by a l spring 113`Which is, connected at one. end to thegpawl a'ndat the other end to' the frame Vplece. If the esca ement Wheel 55 were free -to turn backwar ,when the b ack spaceA mechanism is operated, both of the escapement Wheels might turn vbackward and the motion ofthe gear 32 mightV thus be divi-ded between the two escapement Whee1s vin which casethe escapement Wheel 51 vmight not turn far- ,enough for the incid?` tooth i thereofto'becaught bythe dog Afcaffase shelf ".3, and,` said s e -release'fhandle may be lconnected slide to raise the same and de mayhave pivoted thereto .a dog-1 115, havingitsgend beneath rojecting fromthefeed dog 57 release device InaylQOIF-lprise a lift the feed dog out of engagement With the escapement Wheel. Said escapement wheel will then be-free to turn to any extent in either direction, and the carriage will, in consequence, be free"`to move in either directlon.

The construction and mounting of the universal barand the associated mechanism for operating said universal' bar, shown and described herein, form the subject-matter of an application of mine filed January 3rd, 1908, Serial No. 409,214, Which application is a division of the present application.

Various changes in the details of construction and arrangement may be madel without de arting from my invention. Y

'sVhat I claim as new and desire to secure by Letters Patent, is

1. In `a\typeWriting machine, the combination with. the carriage, of feed dogs for controlling tmjeed of said carriage; and a universal bar mounted for bodily motion of translation and on Which said feed dogs are l riage a universa bar having a bodily motion of translation; and feed do s on said univer- 4sal bar and coperating wit said escapement 5. In a -ty` ewriting machine, the combination With t e carriage, ofl a plurality of escapement Wheels geared to said carriage; and means for. preventing backward rotation of one ofjsaid escapement Wheels.

. 6. In a typewriting machine, the combination ot' a detachablewe'rriage having a rack bar rigidly mounted'- thereon; la drivingv spring; an escapement`v`vheel. geared to -said rack bar; means for detachably securing said carriage to the main frame fand an escapement mechanism adapted to control said spring Whether the carriage position on the machine or not.

7. In a typewriting machineythe combination of a detachable carriage; a driving spring for said carriage; an escapement mechanlsm' for controllingy said carriage;

and means whereby said escapement mechan-vl ism controls said s ring Whether the carriage be 1n osltion 'on t e machine or not.

8. n a typewriting .'machine, v the combination withlhe carriage, of a plurality of escapemfwheels for controlling the feed of said carriage in one direction; a step-b step device for feeding said carriage in t e other direction andmeans for preventing backward rotation of one of said escapement Wheels.

9. In a ty ewritingmachine, the combination'with t e carriage, of a plurality of escapement Wheels for controlling the feed ofl sald carriage in one direction, one only of said escapement Wheels being capable of backward rotation'.l

10. In a ty ewriting machine, the combination with t e carriage, of an. escapement Wheel; a reciprocatory member yconsisting of a piece of sheet metal; a fixed dog consisting of an ear bent upfrom said sheet metal member; a loose dog pivoted on said sheet metal member; and ears bent up from said'sheet metal member and constituting' stops to limit the motion'of said loose dog about its pivot.

Signed at Svracuse, in. the county of Onondaga, and State of NenT York, this 17th-day of October, A. D. 1904. p l

' ALEXANDER T. BROWN.

Witnesses:

KAREU voN KLosTER, LENA E. HAYES.

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