US1900103A

US1900103A - Calculating machine

Info

Publication number: US1900103A
Authority: US
Publication date: 1933-03-07
Anticipated expiration: 1950-03-07

Description

V March 7,1933. UgELMANN 1,900,103

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ULSZGUBELMANN 4 4 March 1933- w. s. GUBELMANN 1,900,103

CALCULATING MACHINE Original Filed Sept. 19. '1912 11 Sheets-Sheet l0 abboznggd' March 7, 1933. w.s. GUBELMANN CALCULATING MACHINE Original Filed Sept. 19. 1912 ll Sheets-Sheet 11 gwuvnto'a MSfiUBELMANN 61 H301: mug U Patented Mar. 7, .1933 V PATENT OFFICE WILLIAM: S. GUBELIANN, OI BUFFALO, NEW YORK OALCULATIN G IACHINE Original application filed September 19, 1912, Serial No. 721,141. Divided and this application filed larch 30, 1827. Serial No. 179,525.

' 19,1912, now Patent No. 1,817,451, August 4, 1931, and is particularly directed to the keyboard features of the parent application,

having to do primarily with the key locking, interlocking and releasing mechanisms but including as well other general and specific features of the key mechanism as a whole.

Among the many new and improved features of the keyboard mechanism which applicant has invented and embodied in this application may be mentioned the improved form of key locking and releasing mechanism whereby a key when depressed will be held in its operative position until a certain period in the operation of the machine and then automatically released, the means for this purpose being so arranged that as little bur-. den as possible is placed upon the keys which are provided for controlling the functions and operations of a main operating mechanism. The construction of this mechanism is such that the keyboard may be converted at will into either a locked or a flexible condition. If it is placed in the locked condition a key when depressed can only be released and restored to normal upon operation of the machine or by means of special correction keys. However, when the flexible condition of the keyboard is predeter- 1 mined then depression of any other key in the same bank with apreviously depressed key will serve to release such previously depressed key. An intermediate condition of the keyboard may also be obtained in accordance with the present invention and this may be termed a semi-flexible or combination condition, under which it is ssible to depress a' second key in a bank and thereby release the first but depression of the second key meets with additional resistance which serves as a warning that one key in the bank has already been depressed. Regardless of the condition of the keyboard, whether flexible, semi-flexible or locked, the keys become positively locked in either depressed or undepressed position upon commencement of an operation of the machine dueto the provision of certain connections from the mechanism which releases the parts of the machine.

Another feature of the present invention is the provision of a plurality of means for releasing any depressed amount keys. One

main operating of these key releasing mechanisms is that.

which is automatically normal operation of the machine, and it is so designed that the keys will be released early in the cycle of the o eration of the machine, this being in the illustrative machine substantially at the end of the first half portion of the cycle. In addition to this automatic releasing mechanism there is provided a universal correction mechanism which is manually operable to release all of the depressed keys simultaneously without necessitating an operation of the machine. In accordance with the present invention this mechanism operates in a large part through the same train of mechanism that is employed for the automatic key release. Still another feature of the key releasing mechanism is the provision of individual release keys one of operated upon each which is associated with the keys of each bank' and adapted to effect the release of the keys in each particular bank. This individual or column release mechanism is so constructed that it is no longer operable after an operation of the main operating parts of the machine has once begun. Various other improvements which have been incorporated in the releasing mechanism will be apparent from the full description of this mechanism which will be given hereinafter.

Another phase of the invention has to do with the provision of means for various keys to remain depressed uring suc cess'ive operations of the machine. This repeat mechanism is so constructed that the automatic key releasing mechanism may be disabled either for the entire keyboard or for individual sections of the keyboard. The machine disclosed in the parent case is adapted to be operated by means of a spring motor and a number of keys as well as a lever rmitting are provided for releasing this motor to permit it to operate the various portions of the machine. One of these motor release keys is connected by a suitable mechanism with the nism is so constructed that when one or more special keys are depressed the automatic key releasing train of mechanism is rendered inefiective so far as the particular bank or banks of keys selected are concerned, while the automatic release of keys in other banks remains undisturbed.

The machine herein disclosed is equip ed with a bank of s ial shiftin ke sin a dition to the regu ar amount I ey anksand while this s cial bank is provided with a number of t e features which have been explained in connection with the amount key anks, there are other features which apply particularly to this shifting key bank. In view of the nature of the keys contained in this bank and the functions which they control within the machine, they are arranged in ups, the keys of one group having a di erent relation to the amount key banks from the keys of another group. This gives rise to a feature of the present invention which may be termed the split bank and it is through this special s lit bank construction that the keys of eac roup may have certain similar effects upon t e various functions of the machine which difler from the efiects of the keys of the other oup. One such distinction which may be ere pointed out is that of the provision of an interlock between the amount keys and the ke s of one.

group of especial keys while no such interlock is provid between the amount keys and the keys of another grou of special keys.

Another 'featurew ich ma be mentioned in connection witli the specia key bank as a whole is the provision of means for automatically releasing these keys upon an operation of the machine. The means for this purpose operates independently of the automatic releasing means for the amount keys and is operable at an entirely difierent sta in the cycle of operation of the machine. ereas t e amount keys are automatically released com aratively early in an operation of the mac ine the special keys are not released until relatively late in the operation. Still another feature which is to be found in the s cial key bank but not in the amount key ha is the provision of means for reventing the depression of more than one y of a certain group of keys either simultaneousl or in sequence. This is required in connection with certain keys in order to prevent an attempt to produce contradictory controlsover the operation of portions of thepomputing mechanism. The form of single key mechanism which has been provided by this invention is such, furthermore, that either one of two keys or both may be depressed and caused to act upon a single element of this keyboard of the-calculati ture of this construction w 'ch may be men- "tioned is that conflict between the records blocking mechanism so as to'prevent operation of any of the other keys associa with this mechanism.

The resent invention further contemplates a special form of interlock between the two keys referred to above of this special key bank which keys are located in different ones of the two grou s' which have been mentioned. This inter ock is of special construction and is so designed that the two keys may be depressed simultaneously or successively in a certain sequence but may not be depressed successively in the inverse order. Another very simple but effective feature of the resent invention is the provision of remova 1e keyboard dividing bars which may be placed between any two banks of keys desired or may be completely removed from the machine. As many of these bars as may be required may be employed to divide the keyboard. according to any system desired such as the American monetary system or the regular decimal system.

Among other novel andimproved features of the keyboard which will appear fom the detailed escription are the construction of the keys themselves, the arrangement of s rings for restoring the keys to normal, and

t e connections from the amount keys-to certain differentially movable parts whose movements the keys are intended to control. The latter function is effected by means of a novel arrangement of the keys and cooperating stop bars. Still other improved constructions might be enumerated but reference ma be had to the body of the specification as w l as the claims for an explanation of such constructions.

-In the parent application the keyboard, which has been discussed in the foregoing sections, is related to a calculating unit which, as has already been stated, is operated b a spring motor releasable by any one of a p urality of operating keys or by means of a hand lever. This calculating unit is disclosed in connection with a typewriting unit and the machine is so organized that both the calculating unit and the typewriting unit are capable of recording u on the same record material carried by suitable platen mechanism. It is another primary object of the resent invention to combine these two units and certain operative portions of the calcu-' lating unit and in the present machine this connection is adapted to be controlled by the unit. One feaproduced by the mechanism and hereinafter and it should be borne in mind that the foregoing serves to point out only a "portion of the primary objects. It has been the general object of the invention to improve the construction of the keys and keyboard mechanism of calculating machines in all particulars and the specific objects above mentioned will serve to indicate the trend of the improvements which have been embodied in the present invention. An illustrative machine embodying the various features of the invention will now be described in detail with reference to the accompanying drawings which may be regarded as a part of the specification.

Of the drawings:

Fig. 1 is a plan view of the calculating machine showing particularly the arrangement of the keys on the keyboard.

Fig. 2 is ,a detailview in side elevation taken' to the left of the special key bank.

Fig. 3 is a detail view of the keyboard mechanism in side elevation taken to the right of one of the banks of numeral keys.

Fig. 4 is a sectional elevational view showing a bank of amountkeys and their relation to various operating portions of the machine.

Fig. 5 is a view similar to Fig. 4 but illustrating the position of the parts after the machine has been partially operated.

Fig. 6 is a detail of various connections operated by-one of the special keys.

Fig. 7 is a sectional view in elevation taken to the left of the special key bank and illustrating various mechanisms operated by these keys.

Fig. 8 is a detail in plan view of certain singlekey mechanisms provided for the specia key bank.

. Fig. 9 is a transverse sectional view in elevation omitting various parts and showing particularly the keyboard and some parts cooperating therewith.

Fig. 10 is a detail of certain connections 55 operated by the operating keys and the opcrating handle.

, Fig. 11 is a detail in elevation of the plu-' rality of operating keys and certain of their connections.

Fig. 12 is a plan view in section taken on taken the line 12-12 of Fig. 4 and showing the. mechanism associated with the keyboard and located directly below the keyboard plate.

Fig. 13 is a fragmentary vertical section in front of the foremost line of keys.

e typewriter keys in locked- Fig. 14 is a vertical longitudinal section of the keyboard showing one of the keys depressed and the parts in the position which they occupy preparatory to operating the machine.

Fig. 15 is a similar view showing the position of the parts while the machine is being operated.

Fig. 16 is a fragmentary view similar to Figs. 14 and 15 but showing the parts set for converting the keyboard into. a lock keyboard.

Figs. 17, 18 and 19 are detached side views of the stop bar, locking bar and releasing bar, respectively, for each row of keys and parts connecting therewith.

' Fig. 20 is a view similar to Figs. 14 and 15 showing the special shift keys and connecting parts.

'Fig. 21 is a fragmentary vertical cross section of the keyboard showing the means for holding the keys yieldingly in their elevated position.

Fig. 22 is a fragmentary vertical long1itudinal section of the column lock or repeating mechanism.

Fig. 23 is a perspective' view of the key tensioning device. v

Fig. 24 is a fragmentary sectional view showing the means for rendering the keyboard either flexible or lockable.

Fig. 25 is a detail perspective view ofa keyboard dividing element.

Fig. 26 is a perspective View of the key releasing mechanism operated by the universal the typewriter key levers and adjacent parts.

Fig. 31 is a perspective view of a part of the -mechanism connecting the typewriter and adding machine unit.

Fig. 32 is a perspective view of an interlock between two special keys.

Fig. 33 is a fragmentary horizontal section showing means for locking a shift key in depressed position.

Fig. 34 is a perspective view of certain parts of the interlock between the typewriting mechanism and the adding machmeumt- Fig. 35 is a fragmentary elevational VleW showing connections from a special shlft key.

General organization of the machine As has already been mentioned the machine disclosed in the parent case is a com bined computing machine and typewriter in which the computing machine unit is adapted to perform various types of calculation and is adapted to record the quantities entering into the calculation. The machine as a whole is so designed that the computing unit may be completely removed from the typewriter and operated independently of the latter. When inserted in the typewriter frame, however, certain connections are provided between the two units so as to prevent confusion in the o eration of the two and so as to permit recor ing upon a'common record sheet.

Considering first the computing unit, said unit is provided with suitable supporting frames comprising a base plate, a pair of side frames and a palr of'vertical intermediate frames. All of these frames are suitably supported upon the base plate and are held in osition by any suitable means so as to provi esu ports for the various operating shafts and -ot er parts of the computing machine mechanism. Thekeyboard of the computing unit which is one of the primary features to be covered by the present application is adapted to control the various functions performed by the other mechanisms in the machine. The construction is such that depression of the keys will shift certain elements within the machine to control the operation of other elements upon the o ration of a main operatingshaft. The various sections of the machine-having a direct bearing upon the construction and operation of the keyboard will now be described in detail, reference being made first to the general operating parts.

Main operating frame mechanism For the purpose of operating the various portions of the calculating machine under the control of the mechanisms set directly by the keys on the keyboard, there is provided a chain of operating mechanism only a portion of which need be described in this application. Referring particularly to Figs. 4 and 5, a shaft 108 is provided and may be termed the main operating shaft of the machine. A crank in 111 is carried by a pair of discs secured to shaft 108 and it will be apparent that in the rotation of the shaft the crank pin will have a certain extent of vertical reciprocation. A link 120 connected at its lower end to the crank pin 111 and at its upper end to a rearwardly extending arm 119 of a threearmed frame pivoted about a supporting shaft 26 serves to transmit movement from the main shaft to various portions of the machine. A forwardly extending arm 116 of the threearmed frame is connected by means of a link 118 to cross-rod 112 which is carried by a pair of arms such as 114, shown in Figs. 4 and 5, loosely mounted upon a supporting shaft 36. A corresponding link similar to 118 is provided at the opposite end of the cross-bar 112 116 on another rockable frame. The third arm 123 of the three-armed member together with a corresponding arm of the other rockable frame carries at its lower end a crossrod 121 which, as more fully disclosed in the parent application, serves to control the operation of a series of actuating devices for the totalizer wheels and printing elements which do not form a part of the invention to be covered by the present divisional case.

The number setting key mechanism Passing now to the construction of the number key banks of the calculating machine keyboard the functional relation ofthe parts, such as pointed out in the statement of objects of the invention, will first be briefly reviewed and then the details of the mechanism will be explained.

The number key setting mechanism is constructed to provide the following:

First, means whereby the setting keys are locked down after being depressed until released by the operation ofthe machine.

Second, means whereby all the setting keys are locked against movement during the operation of the machine.

Third, means whereby the setting keys that have been depressed are released and restored and the setting keys that have not been depressed but have been locked against movement during the first part of the operation of themachine are released so that they can be set for a subsequent operation before the return movement of the actuating gears and operating mechanism and before the end of the forward movement of the operating lever, thus enabling the settin keys to be set for a subsequent operation be ore the completion of the preceding 0 ration. Such a setting of keys may be ma e immediately after the hand I leaves the operating lever at the end of its forward stroke.

Fourth, means are also provided whereby the mac ine may be made to cause a wrongly depresse key-to be released by the depresslon of the correct key in the same column, in other words a flexible keyboard.

Fifth, the flexible keyboard may be. altered by the machine operator into a locked keyboard, in which any number key, upon being depressed, is locked in depressed position and all the remaining number keys in the same column are locked against depression. With this setting a wrongly depressed key can be released before-the operation of the machine only by the use of an individual column release or correction key located at the top of the row of keys, or by a universal correction key.

Sixth, the keyboard may also be conditioned by the machine operator when desired to produce a combination keyboard combining the advantages of both flexible and locked and is connected to an arm very similar to keyboards, allowing the easy depression of one key in a column but offering substantial resistance to the depression of a secondkey inthe same column without positively look ing the column. With this setting depression of a second key releases the first key but requires considerable more force than is required to depress the first key. This additional resistance serves to notify the operator that a key has already been depressed in that column and thereby guards against error.

The key setting mechanism is constructed as follows 210, Figs. 1, 3, 4, 5', 14, 15, 16 and 21, represents the number setting keys, which are arranged in parallel longitudinal rows or 001- 1 umns, there being nine of such keys in each row and as many rows as are required to provide the intended capacity of the machine.

Each of these keys is provided with a depending stem or shank 211 which 13 guided in upper and

lower guide plates

212 and 213 at the top of the machine so. as to be capable of vertical reciprocation therein. The key shanks are flat sided and their guide openings areof corresponding form to prevent their turning. The setting keys are normally held in an elevated position by a plurality of coilsprings 214. A row of these springs is arranged under the lower guide plates 213 between every two rows of keys and each spring has its ends connected with the lower ends of ai pair of keys in adjacent rows. The coils of the springs 214 in each row are mounted on a longitudinal rod 215 which is supported at opposite ends on the under side of the lower guide plate 213, as shown in Figs. 4, 5, and 21. Each setting key is provided in its shank or stem between the upper and lower guide plates with upper and

lower openings

216 and 217. Extending lengthwise through the lower openings of the several key shanks in each row is a set of three longitudinally

movable bars

218, 219 and 220 which are arranged side .by side. The stop bar 218, Fig. 17, at the left of each of these sets is connected at its front end with the upper arm 221 of one of a series of differential stop levers 35, Figs. 4, 5, 12 and 13, and is provided on its upper side with a series of stop'lugs 222. Each stop lug has an abrupt front side and an inclined rear side and-is adapted to co-operate with the upper edge of the lower slots 217 in one of the setting key. stems. Each stop 222 is spaced a distance from its respective key stem so that when its stop bar 218 is arrested in its forward movement by any one of said stops 222 engaging a depressed key, the companion differential stop lever 35 will be arrested in a position to present one of a series of stops 37 thereon in the path of the front end of an actuating gear segment 25, and arrest said gear segment after a forward movement corresponding to the value of the key depresed. Thus thenumber one key has its stop so located that when its stop bar is arrested by its stop'222 engaging its key stem the corresponding stop lever 35 will have its number one stop 37 in the path of gear segment 25, and limit the forward movement of said gear to one step or tooth. Number two key has its stop so arranged that it will in a like manner limit the forward movement of the actuating gear to two teeth or spaces and so on through the series. In rear of its stop lugs each stop bar 218 is provided with a single main detent tooth 223 and in rear of said main detent tooth with a series of closely spaced auxiliary detent teeth 224 arranged lower than the main detent tooth and corresponding in number to the stop lugs 222, and each having an abrupt front side and an inclined rear side, as will be seen in Fig. 17. The upper arms 221 of the differential stop levers are spaced far apart while the lower arms 35 thereof and the mechanism cooperating therewith are spaced close together. For convenience in manufacture these upper and lower arms of the differential stop levers are made straight and journaled on the transverserod 36 and each pair of corresponding arms 221 and 35 is connected by a yoke 225, the several yokes varying in length according to the distance between the respective arms and arranged to avoid interference with each other, as shown in Figs. 4, 5, and 13.

The looking or central bar 219, Fig. 18, of each set is provided .on its upper side with a plurality of rearwardly projecting hooks 226 one of which is adapted to engage with the upper opening 216 of each setting key. Each of these books has its bill provided at its rear end with a rearwardly inclined upper face 227 forminga cam, and with a forwardly inclined lower face 228. At its rear end each locking bar is rovided with a rear stop 229 and in front 0 said rear stop with low, middle and high stop shoulders 230, 231 8.11% 232 arranged respectively one in ad'- vance f the other. Between its hooks and stop shoulders the locking bar is provided with a. correction lug 233 having an inclined rear face 234 and an upper face 235 parallel with the edges of said rod 219.

At its extreme rear, projecting to the right the lock bar is provided with a lug 236 to which is attached the spring 237 which tends to normally draw the lock bar rearwardly.

At its front end the locking bar 219 is provided with a laterally projectin pin or shoulder 238, Figs. 12 and 13, an between said shoulder and the hooks 226 with an upwardly projecting restoring lug 239, as

' shown in Figs. 14, 15, and 18. 240 repreor shoulder 243 in rear of the plain face, as shown in Figs. 3, 4, 12, 13, 14 and 15. Each of the tension 11 rs is yieldingly pressed against the under side of the shoulder or pin 238 of its res ctive locking bar 219 by a tin 2820 (Figs. 12 and 13) and is provide ad acent to the restoring lug 239 of the locking bar with a similar lug 244, as best shown in Figs. 3 and 14. Tra'nsversely in rear of the

lugs

244 and 239 of the several tension fingers 240 and locking bars 219 a universal restoring bar 245 is arranged and secured at opposite ends b means of

arms

246 and 247 to the rock s aft 241, as shown in Figs. 3, 4, 5, 10, 12, 13, 14, 15 and 22. This shaft is turned in the direction for engaging the

lugs

244 and 239 and shifting the same forward by means of a vertically swingin rock arm 248 pivoted on the 1101!- lontal s aft 26 havin a shoulder or lug 249 adaited to be engage b the ri ht arm 123 of e operating frame uring t e last portion of the forward movement of the same, and a link 250 connected at one end with the free end of said rock arm 248 and at its opposite end with a rock arm 251 on the rock shaft 241, as shown in Figs. 4, 5, 10 and 13. The backward movement of the universal bar 245 is effected b a spring 252 which is preferably connec with the rock arm, as shown in Figs. 4 and 5.

Releasing bar co-operate with one .of the setting key stems.

At its rear end the releasing bar is provided with an u wardly projecting lug 255 havf ing an inc med face or cam on its front side and a downwardly projecting lock finger or hook 256, as shown in Fig. 19. When free each releasing bar is moved rearwardl by a s ring 257 shown in Fig. 12. The Ice ing and releasing

bars

219 and 220 are only caable of longitudinal movement but the stop bar 218 is capable of both longitudinal and vertical movement for a purpose to be hereinafter described. Normally each stop bar 218 is yieldingly "held in its elevated position by a rock shaft 258 joumaled on top of the lower guide plate 213 and having arms 259 at opposite ends which project laterally below notches 260 in the under side of the locking and releasing

bars

219 and 220 of a set, into engagement with the under side .of the respective stop bar, and a spring 260a applied to the rock shaft 258 and operating to turn the same so as to lift the stop bar 218, as best shown in Fig. 12, and partially shown in Figs. 3, 4, 5, 14 and 15.

261 represents a plurality of releasing pawls or dogs each arranged transversely above therearendofoaeset of stop,locking and releasing bars, and supported at opposite ends by two rock arms 262 which are mounted loosely at their rear ends on a transverse rod or shaft 263 arranged in the rear upper part of the machine. In the normal position of the parts, each of the releasing pawls 261 engages with its front side against the middle shoulder 231 of the locking bar 219 and holds the latter against backward movement, while its rear side is engaged by the detent lug or shoulder 223 of the stop bar 218 and the rear cam 255 of the releasing bar 220, as shown in

Fi

4, 17, 18 and 19.

264 represents a plura ity of detent pawls one of which is arranged in rear of each releasing pawl 261 and is supported at opposite ends on the rod or shaft 263 by means of rock arms 265, as shown in Figs. 12, 17, 18 and 19. In the normal position each detent pawl 264 is engaged on its rear side by the foremost of the closely spaced detent teeth 224 of the stop bar 218, as shown in Fig. 17. The releasing and detent pawls are yieldingly held in their normal osition by avity'aided by the springs 23 and 257 s own in Figs. 12 and 18.

266 represents a universal detent pawl releasing bar arranged transversely underneath the several detent pawls 264, and supported at opposite ends by rock arms 267 which are mounted loosely at their rear ends on the transverse rod or shaft 263, as shown in Figs. 12 and 16. The side arms 265 of the detent pawls 264 are provided with downward extensions or feet 2641 (Fig. 14) to be engaged by the universal detent pawl releasing bar 266 and the latter is adapted to lift the detent awls simultaneously out of engagement rom the several stop bars 218. The upward movement of the universal bar 266 is effected during the first part of the movement of the 0 rating mechanism by a trip dog-268 which is pivoted at its lower end on the rear end of a rock arm 269, which is operated by the operating mechanism during the first part of its movement in a manner which will be hereinafter described. This trip dog engages its shoulder and upper end with the umversal releasing bar 266 connecting the same with the operating mechanism, as shown in Figs. 3, 4, 5, 14 and 15.

270 represents a longitudinal trip bar connected at a front end with a depending rock arm 271 secured to the upper front rock shaft 241 and having a loose connection at its rear end with the trip dog 268, preferably by a pin 272 and slot 273, as shown in Figs. 3, 4, 5, 10 and 13.

274 represents a retaining do which is pivoted on the frame and adapt to engage with a pin or shoulder 275 on the trip bar 270. The dog 274 is moved rearwardly and the tnp dog 268 is moved forwardly by a ring 276 the same. There." ni'au' 274 being limited by a stop 277 on the frame.

278, Figs. 4, 5, 12, and 14, represents a horizontal universal stop bar arranged transversely above the several detent pawls 264 in rear of the stops'229 on lock bars 219, and supported at opposite ends by rock arms 279 which are mounted loosely at their rear ends on the transverse rod or shaft 263 and the universal stop bar 278 rests with its weight on the detent pawls 264.

280 represents .column correction keys one arranged at the upper end of each row or column of keys, as shown in Figs. 1, 4, 5, 14, 15 and 16, and which are of similar construction to the number keys 210 with the exception that the upper opening 216 in the shank 211 may be omitted but for convenience in manufacturing it may be retained. In its normal or raised position the upper part of the lower slot 217 of said keys 280 is in rear of the cam face 234 of the correction lug 233 on the lock bar 219. 1

The operation of the setting mechanism thus far described is as follows V In Figs. 4, 17, 18 and 19 the several parts of the mechanism are shown in their normal position in which all of the keys are elevated, the stop bars 218 and the releasing bars 220 are in their rearmost positions. The in clined rear side 254 of the lugs 253 on the releasing bars 220 abut against the upper side of the lower opening 217 in the number key stems 211, as shown in Fig. 4, and the looking bars 219 are in their foremost position, the several releasing pawls 26l are depressed and engage with the abrupt front side 223 of the detent lugs of the stop'bars 218 and the middle stop shoulders 231 of the locking bars 219, and the several detent pawls 264 engaged with the foremost auxiliary detent tooth 224 of the several series on the several stop bars 218 and the respective tension fingers 240 rest with their plain front faces 242 against the latterly projecting pin or shoulder 238 of their respective lock bar 219 offering practically no resistance to the movement of the lock bars, as shown in Fig. 4.

Assuming now that key number 5 of a series is depressed, as shown in Fig. 19, the upper edge of the lower opening 217 of its stem will first engage the inclined rear side 254 of the adjacent lug 253 of its respective releasing bar 220 and shift the latter forwardly into the position shown in Fig. 14, causing its rear lug 255 to raise its respective releasing pawl 261 sufficient to disengage it from the stop 223 on the respective stop bar 218 which is, however, still held against forward movement by the detent pawl, 264; and to disengage the said releasing pawl 261 from the middle stop 231 of its respective lock bar 219, allowing it to move rearwardly until arrested by its rear stop 229 against the universal stop bar 278. This movement of the lock bar 219 is just sufiicient to allow its hook 226 to pass through the upper opening 216 of said key stem 211 and lock the latter in its depressed position, bringing the cam face 227 of the hook in line with the upper edge of the lower slot 217 of the keys of the row not in the depressed position, and to move the laterally projecting pin or shoulder 238 on the displaced lock bar 219 rearwardly, allowing its tension finger 240 to rise under the tension of its spring 282 and present its abrupt face or shoulder 243 against the pin 238on its respective lock bar. p

The effect of the above is that when a number key is depressed in any column its respective stop bar 218 is released from its releasing pawl 261 but is still held against movement by its detent pawl 264 in engagement with its tooth 224. and the number key depressed is held in the depressed position, but should it be desired to depress another key in the same column instead of the one already depressed, as for instance the first key depressed is an error, the second key may be depressed and by so doing the upper face of the lower opening 217 of its stem engages the inclined cam face 227 of the hook on its lock bar and forces the latter forwardly, thereby 216 of the previously depressed key. The

continued downward movement of the second key brings its upper opening 216 in line with its hook 226 on the lock bar 219, allowing it to enter and lock down said key. As the lock bar is forced forward by the last depressed key, its pin 238 engages the abrupt face 243 of its respective tension finger 240, which offers considerable resistance to the forward movement of the lock bar and the depression of any key in the same column subsequent to the first key depressed in said column, the purpose of which is to notify the operator that a key has previously been depressed in this column should he by mistake have depressed a second key in the same column. This is what I term the combination keyboard as it combines the advantages of both the lock and the flexible keyboard,

but this keyboard can be changed into a lock keyboard or a flexible keyboard as will be described.

\ Column correction key If it is desired to release a key that has been rection key stems 211. and causes the lock bar to move forwardly and disengage its hook from the lower side of the upper open- 7 ing of any depressed key thereby releasing it, the correction key again rising by the action of its spring 214 immediately as the pressure on the same is released.

After the desired keys have been set and the machine is operated, by depressin its operating lever or one of its operating eys, and during the first part of the forward or downward movement of the operating lever or keys, which latter will hereinafter be more fully described, the rock arm 269 and with it the trip dog 268, Figs. 3 and 10, are raised by the operating mechanism, the trip dog raising the universal releasing bar 266 which in turn raises all the detent pawls 264, releasing all the stop bars 218 and allowing such of them and their respective stop levers as have been also released from their respective release pawl 261 by the'setting of a key to move forward by the action of the spring 281 until arrested by the stop 222 corresponding to the key depressed. In this movement the stop 37 on the stop lever 35 corresponding to each operated key depressed is moved into position to arrest the gear segment 25 after it has moved a number of spaces or teeth corresponding to the value of the depressed key. The operating mechanism is constructed to, at the beginning of its movement, release the stop bars 218 and the latter and the stop levers 35 are moved by the springs 281 in advance of the gear segments until arrested by the bar 112, after which vthe operating frame, of which the bars 121 and 112 are a part, is moved allowing the gear segments to move and the stop levers to continue their movement in advance of the gear segments until arrested by the key depressed "after which .they arrest the forward movement of their respective actuating gear segments in a position corresponding to the ke depressed.

The raising of the detent pawls 264 at the initial part of the operation of the machine also raises the universal stop bar 278, which lies on the detent pawls, thus movi it out of the path of the rear stop 229 on t e lock bars 219 and allowing them to move rearwardly by the action of their springs 237 until arrested by their high stop 232 engaging the front side of the release pawls 261; this allows the hooks 226 to move rearwardly in the lower slot 217 of all the number keys that have not been depressed in said row, moving the incline face of the hooks 226 beyond the path of the upper side of the lower opening 217 in the key stems and in its stead presenting the flat upper side of the hook and securely looking all the keys against movement, thereby reventing the depression of any of the num r keys in a row where one key has already been depressed after the machine has started to operate, as shown in Fig. 15. In a similar manner the correction lug 233 is moved forwardly until its upper flat face 235 is moved under the upper side of the lower slot 217 of the correction key 280 and thereby preventing the correction key from being operated after the machine has started to operate, as also shown in Fig. 15.

The raising of the trip dog 268 simultaneously raises the longitudinal trip bar 270 until its pin 275 is moved above the shoulder of the retaining dog 274, and the latter is drawn to engage its shoulder under the said in by the action of the spring 276 and therey retains the trip dog 268, the longitudinal trip bar 270 and the universal releasing bar 266 together with the several detent pawls 264 in their elevated position, allowing the stop bars to move free of said detent pawls. As the operation is continued and the operating frame nears the end of its forward movement and after it has moved suflicient to allow a gear rack arm 25 to reach the nine position, its arm 123 engages the finger 249 on the vertically swinging rock'arm 248 and raises.

it, and through the medium of link 250 and arm 251 moves the universal restoring bar 245 forwardly, engaging the restorin In 239 of the lock bars 219, moving saifi loc bars forwardly until the middle stops 231 are in a position in advance of the releasing pawls 261 and withdrawing the hooks 226 of the lock bar 219 out of enga ement with and releasing the keys depresse The keys are restored to their normal or raised by their springs 214. At the same time the universal restoring bar 245 engages the lug 244 on the tension fingers 240, moving its abrupt face or shoulder 243 out of the path of the pin 238 of the stop bar and preventing the tension fingers from resisting the forward movement of the lock bars.

Simultaneously with the forward movement of the restoring bar 245 and actuated by the same mechanlsm the trip bar 270 is moved rearwardl and as the retaining dog 274 is prevented rom moving rearwardly by the pin 277 the pin or shoulder 275 moves out of engagement with the dog 27 4, allowing the trip bar 270, trip dog 268, the universal bar 266 and .the detent pawls 264 to drop to the lower position, and the detent pawls to engage the teeth 224 of the stop bars 218,preventing the forward movement of the stop bars by the spring 281. The construction 1s such that the detent pawls engage said teeth before the stop bars are released by the depressed key. VVhen the number key is thus released its release bar 220 is freed to move rearward by its spring, to the position shown in Fig. 4.

On the early part of the return movement of the operating frame the arm 123 moves rearwardly, allowing the rock arm 248 and the link 250 to move downwardly and the universal restoring bar 245 to move rearwardly, which allows the lock bar to be drawn rearwardly by its spring suflicient for its middle stop 231 to be engaged by the resition lease pawls 261 and thus sued the further rearward movement of the lock bars 219, and also allows the tension fingers 240 to engage the pin 238.0n its respective lock bar 219 with its plain front face 242, offering practically -no resistance to the depression of a number key. As the operating frame continues on its return. movement its stop bar return rod 112 moves forwardly and forces the stop levers forwardly and the stop bars 218 rearwardly vent their forward movement by the spring When the keyboard is used in the foregoin manner it is what I term a combination keyboard, because it combines as before described the advantages of both the flexible keyboard wherein a wrongly depressed key may be corrected by simply depressing the correct key in the same column and the lock keyboard which prevents the depression of a second key in the same column.

Flezible keyboard- If for any reason it may be desired to make inoperative the means which increase the resistance to the depression of asecond or correct key following the depression of a wron key hr in other words make thekey- I boar what is commonly known as flexible,

this may be done by the following means 282 represents a universal shifting or throw-ofi bar which is arranged transversely over thefront'ends of the several resistance T or tension arms 240 and mounted at opposite ends by means of rearwardly projecting rock arms 283 on the shaft 241, as shown in Figs. 4,

5, 14, 15 and 23. This bar is normally held in an inoperative position by means of a ispring284- y Y 285 represents a shifting key arranged inan opening 286; inthe top. plate of the key board and pivoted at its lower end on one of the supporting arms283 of the throw-ofi bar 282. On one side the shifting key is provided with an upwardl facing shoulder 287.

-. Upon depressing this ey the throw-01f bar moves all of the resistance arms 249 downwardly out of operative relation with the lock bars 219 and prevents any resistance to I thede ression of the number keys by the tension ngers 240 and making the machine what is known as a flexible keyboard without the advantages of the lock keyboard, and upon moving the shift key laterally while ,throw-ofi'bar will be hel thus depressed so that its shoulder en the under side of thetotf plate then 0 sition. Upon disengaging the shifting Ely 285 from the top plate, the throw-01f bar is permitted to be raised by the s ring into its inoperative position whereby e tension fingers are allowed to become operative.

- The key 285 has a laterally projecting finger 288 to which one end of the s ring is attached while the other end of sai P is attached to the lower plate of the keyboa i 'if this construction serving. to provide the tension'both for raising the bar 282 and forcing the key 285 forward as shown Fig. 23.

Lock keg board When it is desired to obtain what is known as a lock keyboard in which the first key -de pressed in each row is locked down and incapable of correction except by means of a correction key and whereby every other key in the row is locked against depression when a key has been depressed in that row this may be done by raisinghe universal stop bar 27 8 so that it will not engaged by the rear ends or shoulders 229 of the locking bars; When bar 278 is thus raised the locking bars when released are moved rearwardly by their springs 237 until arrested by their stops 230 againsttheir detent pawls 264, whereby their hooks 226 enter the openings in their respective numberkeys to such an extent as to present the upper flat sides of said hooks to said keys, as shown in Fig. 16,-whereb the number keys of the column are all 1 ed against depression and the key pressed is locked down.

- In this positionthe inclined rear face 234.

of the correction lug 233 on the lock bar is;

still'under the upper face of the opening-in the correction key 280, as shown in Fig. 16 and a'wrongly depressed key can be rele by depressing said correction key, whereb said lock bar will be moved forwardl mal position, as shown in Figs. 4 and 18.

The raising of the universal stop bar 27 8 is etfectedby a shifting key 289 connected with one of the 'supportm arms 279 of said bar and projecting upwar y through an op ening 290 in the tophpxlate of the keyboard. When raised theshi g key 289 may be held in this position together with the universal sto -bar connected therewith by a downwardly acing shoulder 291 formed on the shifting key 289 and adapted to engage with one edge of the opening 290, as shown in Figs. 2, 3 and 24.

that has lbeendey 811 ficiently to withdraw its hooks to releasethe key depressed and return said bar to its norin its operative Operation of machikneey the number The locking of all the number ke s in the columns where no key has been