US1505489A

US1505489A - Combined typewriting and computing machine

Info

Publication number: US1505489A
Application number: US644841A
Authority: US
Inventors: Henry L Pitman
Original assignee: UNDERWOOD COMPUTING MACHINE CO
Current assignee: UNDERWOOD COMPUTING MACHINE CO
Priority date: 1923-06-12
Filing date: 1923-06-12
Publication date: 1924-08-19
Anticipated expiration: 1941-08-19

Description

H.L.HTMAN Aug; 19, 1924.

COMBINED TYPEWRITING AND COMPUTING MACHINE Filed June l2, 1923 5 Sheets-Sheet l H. L. PITMAN Aug. 19, 1924.

AND COMPUTING MACHINEv Filed June l2 COMINED TYPEWRITING 1923 5 Sheets-Sheet 5 H. L. PlTMAN Aug. 19, 192.4;

COMPUTING MACHLNE COMBINED TYPEWRITING AND 3.923 5 Sheets-Sheet 4 iled June l2 H. L. PHTMAN COMBINED TYPEWRITING AND COMPUTING MACHINE Aug, 19, 1924.

, 1923 5 Sheets-Sheet 5 Filed June l2 Patented yAug 19, 1924.

UNITED sTATEsPATl-:NT OFFICE.

HENRY L. PITMAN, OF WESTFIELD, NEW JERSEY, ASSIGNOR T0 'UIQL'EEYRMTOOI)y COMPUT- ING MACHINE COMPANY, O\F NEW' YORK, N. Y., A CORPORATION OF NEW YORK.

COMBINED TYPEWRITING AND COMPUTING MACHINE.

Application filed June 12, 1923. Serial No. 644,841.

' means is connected with the subtraction-set- -ting means; so that, upon setting the machine for subtraction, the color of printing is changed, numbers to be added usually being typed in black, and numbers to be subtracted usually being typed in red. In some machines of this type, provisionis made of means to lock the numeral-keys when the carriage reaches a zone in which subtraction is to be effected, the locking means being rendered ineffective by depression ofthe subtraction-key or of the non compute key. In other machines of the type I. referred to, provision is made of means for disconnecting theA ribbon-shifting mechanism from the subtraction-setting mecha,-I

nism when certain .subtraction-zones are reached, vto cause subtraction to be effected in black, and of means for resetting the machine to add and type in red in such Zones.

In practice it has been found desirable to lock the keys when the carriage reaches certain computing zones, irrespective of the form of computation to be effected in such zones, and to provide means, controlled byI suitable keys, to release the numeral-keys and determine the setting of the machine for addition or subtraction in that zone. It has also been found desirable to have the amounts typed in certain Columns on the' spectively, and of suitable color-changing means normally under the control of both the addition-key and the subtraction-key.

Provision may also be made of numeralkey-locking means rendered effective by the carriage when the latter reaches certain computing zonesand releasable by depression of the addition-key, the subtractionkey or a non-compute key.

The color-changing means may be placed under the exclusive control of either' the addition-setting means or the subtraction-setting means, the first result being effected by operation of the numeral-key-locking means,

vand the second result being effected directly by the carriage.

To obtain the desired results for different computing Zones, certain of the columnstops on the carriage may be provided with suitable means vfor operating the numeralkey-locking means only, and thereby placing the color-changing mechanism under the control of the subtraction-setting mechanism, or for locking the numeral-keys and placing the color-changing means under the exclusive control of the addition-setting means. Use may also be made of columnvstops which have no effect on the numeral,-

key-locking means or on the color-changing mechanism.

Other features and advantages will hereinafter appear. i

In the accompanying drawings,

Figure l is a side elevation, partly in section, showing the invention as applied to an Underwood-Hanson bookkeeping \ma chine.

Figure 2 is a detail fview of the escapement mechanism.

Figure 3 is a skeleton perspective view of part of the structure shown in Figure l.

Figure 4 is a fragmentary view, illustrating the locking of the keys as the ca rriage reaches a computing zone, and showing the color-signal disconnected from the subtraction-setting mechanism.

Figure 5 is a view similar to Figure 4, but showing the `keys unlocked by the actuation of the subtraction-key, and the state.- signal shifted yto show, in connection with the color-signal, black subtraction.

Figure 6 is a viewv similar to Figure 4, but showing the keys released by depression of the addition-key,f and the color-signal shiftedto indicate red addition.

showing the numeral-keys unlocked by the addition-keyand the color and state sig- .nals in their normal positions, to indicate black addition.

Figure is a view showing the numerali keys unlocked by the non-compute key.

Figure 11 is a lfragmentary rear view showing the relation of one of the controlling stops to the devices for controlling the connection between the subtraction-setting mechanism and the color-signal, for actuating the key-lock and for automatically tripping the general operator.

Figure 12 is a'rear elevation, partly in section, ofia portion of the structure shown in Figure 10.

Upon depression of an alphabet-key 15 or a numeral-key 16, a corresponding type-bar y17 acts through a bell-crank 18 to swing a type-bar 19 upwardly and rearwardly to cause types 20 thereon to type on a worksheet on the platen 21, rotatably supported in a carriage 22 movable transversely of the machine on front and rear rails 23 and 24, respectively. The carriage 22 is normally urged to the left by a spring-drum, not shown, and its movement in such direction is controlled by means of suitable escapekment mechanism comprising an escapement wheel 25, connected with the carriage by means of a rack 26 pivotally mounted on the carriage and normally in engagement with a pinion 27, having a usual one-way connection with the escapement wheel 25.

The escapement wheel is normally held against rotation under the influence of the spring-drum by means of a loose dog 28 mounted on a dog-rocker 29 provided with a iXed dog 30. When an actuated type-bar 19 approaches its printing position, a shoulder 31 thereon engages a bar 32 forming part of a universal frame 33 and moves the same rearwardly to rock the dog-rocker 29 sufficiently to carry the loose dog 28 out of engagement with the escapement Wheel and the Xed dog into engagement With the escapement wheel. During4 the return movement of the type-bar, theuniversal frame 33 and the doug-rocker 29 return to their normal positions, the loose dog again coming into engagement with the escapement wheel 25 and permitting avletter-feed movement of the Acarriage l22 in the usual manner.

In order that type-impressions may be made on a work-sheetl on the platen when the] types are swung against the latter, prorecense vision is made of a ribbon 34 threaded through the upper end oi' a ribbon-vibrator 35. The ribbon-vibrator 35 is normally in' such a position that the ribbon 34 lies beneath the printing line, but, vupon rearward actuation of the universal frame 33, the rib-v bon-vibrator 35 is moved upwardly, to bring the ribbon 34 to effective position, by means of a lever 36 connected with the ribbon-vibrator 35 at its lower end. Said lever 36 is mounted to swing about a fixed pivot 3T, and has an upwardly-projecting rear end provided on opposite sides with pins 38 and 39 at different distances from the pivot 37,

` the connection between the lever 36 and the universal Aframe 33 being effected by means of a frame 40 slidable on the universal trame 33 .to bring one or the other of its slotted sides into engagement with the right-hand pin 38 or the left-hand pin 39 to cause the ribbon to be lifted for typing through the upper black Zone or through the lower red zone.

At its rear the carriage is provided with rods 41 and 42 along which denominationselectors 43may be set, as desired. each denomination-selector being swingable about and slidable along the rod 41, and being held in adjusted position along the rod 41 by means of a tooth 44 to engage with one of a series of notches in the rod 42. Each denomination-selector 43 is set to determine in connection with a Zone-controller 45 a computing zone on a work-sheet on the platen. Such Zone-Controller is in the form of a roller with tapered ends, and, as the carriage enters the computing zone, a frustoconical roller 46 on the denomination-selector 43 rides up on the zone-controller 45 to raise a selector-dog 47 on the denominationselector into Aposition to actuate seriatim a plurality of denominational jacks 48. .Each

jack 48 is swung about a pivot 49 and acts tlhrough a downwardly-extending thrustrod 50 to rock the corresponding lever 51 of a series associated with a series of transposition linkages 52` one for each lever 51,

and a series of bell-cranks 53 actuable by said linkages 52 to advance computationmembers or rack-bars 54 into position with index-pins 55 thereon immediately beneath the corresponding pin-setting bars 56, so

that, upon depression of one of the pin-setting bars 56 by the corresponding numeral- Cir llO

key 16, the corresponding pin on the selec- 12 proaches the lower end of its stroke, strikes an arm 58 on a rock-shaft 59, of which there is one for each pendant 57, except that on the 0 key-lever. and rocks the same to actuate a linkage 6()` of which one of the pin-setting bars forms a part, thereby depressing such pin-setting bar 56 to set the pin of tlhe corresponding value on one of the denominational members 54.

After a number has been so indexed digit l by digit on the pins 55 of the different com- I pins 55 and advance the rack-bars or computation-members 54 distances proportional to the values 0f the index-pins 55 in depressed position. At their forward ends the rack-bars 54 are provided with racks 68 meshing with pinions (not shown), having one-way connections with dials or dialwheels 69, so that, upon advance of the general operator, the number indexed on the pins 55 will be run into the dial-wheels 69, and the result may be read through a sightopening in a computer-casing 71. In practice the handle 61 is usually removed from themachine and the general operator is reciprocated by a power device thrown into operation manually by a key or automatically by the carriage by means to be described hereinafter.

In machines of the Underwood-Hanson type, subtraction is usually effected by the well-known complementary method. To set the machine for subtraction, provision is made of a subtraction-key 72, which, when depressed, acts through a link'73 to swing rearwardly against the action of a spring 74 an upstanding arm 75 fixed on a shaft 76, thereby rocking the latter to withdraw a hook 77 thereon from engagement with a notch 78 in a subtraction-bar 79, and permitting the subtraction-bar to be drawn rearwardly by a suitable spring 80. ln its rearward movement the subtraction-bar 79 acts to set the 9 pins on all of tihe computation-members 54 by means (not shown), and also to shift the connections between the shafts 59 and the corresponding linkages 60, so that, upon depression of a numeraL key, the pin-setting bar 56 usually actuated thereby remains at rest and the bar 56 complementary thereto is actuated, thereby setting the pin on the selected computation member 54 and restoring the corresponding 97 pin on that computation-memberv to normal or unset position. In therearward movement of the subtraction-bar, a pin 81 thereon projecting through the slotted end of an arm 82 swings thesame rearwardly, and consequently rocks in a countereloekwise direction a shaft 83, on which the arm 82 is fixed. Fixed on the shaft 83 is a forwardly-`extending arm 84having a forked end Areceiving a pin 85 on an arm 86 projecting rearwardly from a bar 87 pivoted at its upper edge and extending at its lower edge into notches 88 in said shafts 59, so that the rocking of the shaft 83 by the rearward movement of the subtraction-bar 79 causes the shafts 59 to be advanced to change their connections with the linkages 60. For a fuller disclosure of the subtractionsetting mechanism, attention is called to the patent to Adolph G. Kupetz, No. 1,452,162, dated April 17, 1923.

In order to indicate the color in which typ-` ing is to be effected and the state, addition or subtraction, for which the machine is set at any time, provision is made of a color-signal 89 having two

color fields

90 and 91, usually red andblaek, respectively, and a state-signal 92 having A and S vthereon to indicate addition or subtraction settings, the letters on the state-signal being displayed through openings 93 in the color fields, and the state indications and color indications being displayed through a sightopening 94, in a shield 95 secured on the front of the machine` of sufficient size to show a ring of the colored field around the opening therein through which the statesignal is displayed.

The color-signal 89 is mounted on an upright arm 96 of a lever 97 fixed on the forward end yof a shaft 98 and having an arm 99 projecting to the right and urged downwardly by a spring 100 connected thereto and to a pin 101 projecting rearwardly from the front plate 102 of the typewriter-frame. An arm 103 is fixed to the shaft 98 near its rear end, and to the outer end of said arm 103 is pivoted a depending link 104 passing through a slot 105 in a plate 106 projecting forwardly from a fixed bar 107 of the typewriter-frame. Said link 104 is normally positioned above a vertical plunger 108 pivoted to the rear end of an arm 109 fixed on the shaft 83, so that, upon rearward move; ment of the subtraction-setting bar 79, the plunger 108 will belifted and the color-signal will be shifted from its normal position, indicated in Figure 4to the position indicated in Figure 6, to display the red field 90 through the sight-opening 94. The slot 105 is, however, of suitable extent to permit the depending link 104 to be moved forwardlyv out 'of the path of the plunger 108 by means to be described hereinafter. A connection between the color-signal 89 and the shiftable frame 40 of the ribbon-vibrating mechanism is effected by means of an arm 98n fixed on the shaft 98 and a link 98" connecting said arm 98a and the frame 40.

The state-signal 92 is mounted Ion an upright arm 110 of a lever 111 pivoted on the shaft 98, and having a leftwardly-cxtending arm 112 to which is attached one end of a spring 113 attached at itsV other end to said pin 101. The lever 111 is connected by a rearwardly-extending bail 114 with an arm lll) 115 projecting to the left, and having pivoted thereto a pendent link 116 passing through a slot 117 of said plate 106 and held in alignment with said plunger 108, so as always to be under control thereby. 1t will be seen that, upon subtraction-setting, both the state and color signals will ordinarily be shifted from their Figure 7 to their Figure 8 positions, but, in case the link 104 is moved out of the path ofthe plunger' 108, the upward movement of the plunger will not effect a shifting of the color-signal, and the signals will be set as indicated in Figure 5.

To tabulate the carriage to a computing Zone, use may be made of the usualtabulating mechanism comprising tabulator-keys 1 18a and colunnrstops 118 properlyl positioned along a notched bar 119 at the rear of the carriage. After the digit of lowest denomination has been typed in a computing column or zone, the letter-feed movement of the carriage causes the corresponding stop 118 to engage a dog 120 on a trip-lever -121 to rock the /same about its pivot 122 and to lift a link 123 attached at its lower end' to' an arm 124 fixed to a bail 125 mounted on a pivot 126. c Such lifting of the arm 124 acts, through the bail 125, to swing an ar1nv127 connected with the other end ofthe bail to withdraw a linkor latch 128 from the path of an arm 129 mounted on a pivot 130 and urged upwardly by a spring 131. Upon such release, the arm 129 is swung upwardly and a. forwardly-projecting arm 132, forming with the arm 129 a lever 133, is swung downwardly, and, through a pin 134 pro-jecting froma vertical slide 135, depresses thev latter, thereby rocking a. lever 1 36 and lifting a controlling p in 137 to throw into operation motor mechanism, indicated in general bv 137 a, to cause a complete cycle of the general opera-tor. During the forward movement of the general operator 66, a cam 66n thereon engages an offset forward end 132a of the lever 133 and restores it to normal position to be locked by the latch 128.

Certain of the stops 118 are provided with extensions 138 to shift the controlling link 104 out of the path of the plunger 108, so that setting of the machine for subtraction will not shift the color-signal. Such extensions 138 are of sufficient length to engage,

before the carriage enters the computing Zone, a dog 139 mounted on a lever 140 and swing the-latter about its pivot 122 to lift a. link 141 connectedat its lower end with an arm 142 fixed on a. shaft 143, thereby rocking the shaft against the action of a spring 144. Also fixed on the shaft 143 is an upwardlyextending arm 145 connected by a link 146 with the depending link 104, by which the color-signal is controlled and the rocking ofV the shaft 143, just described, will cause the link 104 to be moved forwardly out of the path of the plunger 108.

150 on a lever 151 and rocks the latter about its pivot152. The pivot 152 projects on opposite sides of an upright post 153, and the lever 151 is connected by a* bridge 154 with an arm 155 at the front of the post 153, so that, upon rocking the lever 151, the

arm 155 is depressed and a pin 156, project- 1 ing through a slot 157 in a vertical keystem 158, depresses the latter against the resistance of a spring 158a and acts through a lever159, attached at its forward end to said key-stem 158'and pivoted at its rear end at 160, to rock the lever 136 and cause thegeneral operator to effect a complete cycle and set the machine for addition. During the forward movement of the general operator the shaft 62 is rocked to cause a cam 161 thereon to engage and lift a bar 162 to cause a pin 163 on the upper end thereof to lift a tail 164 of the lever 151. The bar 162 has a pin-and-slot connection 165 with an arm 166 loosely pivoted on the shaft 62. The addition-key 147 should be held in depressed position until the return movement of the general operator is completed and the lever 151 restored to its normal position. The pin 149 is then to the rear of a shoulder 167 at the rear end of the cam 150, and the addition-key is held in depressed position until released byactuation of the general operator.- The key-stem 158 is provided at its upper end with a key 168 by which the general operator may be thrown into operation at will.

Adjacent the rear end of the link 148 is a lever 169 pivoted on the ceiling 170 of the computer-casing 71 by means of a shouldered screw 171 and pivoted at its forward end to the link 148 by means of a shouldered screw 172. At its rear end the lever 169 is provided with a cam 173 to control the color-changing mechanism whenthe link 104 is shifted out of the path of the plunger 108 connected to the subtractionsetting mechanism. At the rear of'the shouldered screw 171 the lever 169 is con-- nected with the link 148 hy means of a spring 174-, which tends lo hold the 4link l148 in its forward osition and the cani 173 in ineffective position. The cam 173 is provided with a comparatively shallow end' 175, over which the link-104 lies, and is also provided with an incline 176 which, upon depression of the addition-key 147, engages the lower end of the link 104 and lifts the sameto shift the color-signal to indicate typing in red.

Provision is also made of a noncompute 'fork at the lower end of the lever 178 embracing said pin 163 and permitting the pin to be raised and lowered without breaking the operative connection. The pin 163 is connected to the forward end of a llink 180, which, when urged rearwardly against the'action of a spring 181, swings a bellcrank lever 182 about its pivot 183, and, through. a rearwardly-extending arm 184 thereof in engagement with an arm 185 projecting forwardly from -a shaft 186, rocks the shaft and arms 187 thereon against the action of a spring 188 and swings the zone-controller 45 rearwardly out of position to co-operate with the frusto-conical roller 46 on the denomination-selector 43.

The link 180 is guided in a slotted member 189, and when moved .rearwardly is lifted by a cam 190 on the lower side thereof until a shoulder 191 at the forward end of the cam is carried past the slotted member 189, whereupon the link 180 drops with the i shoulder 191 in engagement with the rear face of the slotted member 189, and is held in this position until released by the lifting of the pin 163, as a result of the actuation of the general operator. The link 1804 is provided near its rear end with a laterallyprojecting pin 192,- which, upon rearward movement of the link 180, engages the upper end of a lever 193 and rocks it about a pivot -194 against the action of a spring 195. A

latch member 196 is also mounted on the` pivot 194 and is connected with the` lever 193 by means of a pin 197 projecting through a slot 198 inthe latch member 196 which is constantly urged in a forward direction by means of a spring 199. When the upper end of the lever 193'is swung rearwardly the latch member 196'will be advanced into a position to overlie a pin 200 on the arm 129 of the lever 133' through which the Cil automatic actuation of the vgeneral operatorv is eected, thus preventing automatic action of the general operator whilethe non-com.- pute key is in depressed position. It should be understood that, due to the pin-and-slot connectionbetween the latch 196 and lever 193 and the action of the lspring 199 on the latch member 196, undue strain is avoided if the pin 200 is in raised position at the front of the latch 196 at the time of actuation of the non-compute key.

The mechanism so far describedis in general similar to mechanism disclosed in said patent to Adolph G..Kupetz, No. 1,452,162, dated April 17, 1923. It is desirable to prevent the depression of more than one numeral-key at a time and in certaincases to lock all of the numeral-A bers 202. Forr a fuller disclosure of such key-locking means, reference is made to the patent to Frederick A. Hart, No. 1,339,704, dated May 11, 1920.

To lock all of the numeral-keys, provision is made of a finger 206 which, when swung into an opening between a dog 203 at one end of the series and the fixed abutmentl at that end, crowds the dogs so closely together as to prevent the insertion of one of said intruding members 202, and consequentlyto prevent depression of any one of the' numeral-keys. The finger 206 is mounted on -a rock-shaft 207 normally urged by a spring 208 to hold the finger 206 in ineffective position.

lWhen, however, the shaft 207 is rocked against the action of the spring 208, the finger 206 is urged toward its effective position, and in order to prevent breakage in case the dogs are already crowded together, provision is made of a yielding connection between the finger 206 and the shaft 207, comprising a spring 209 attached at one end to the finger 206 and at'the' other end to a finger 210 projecting upwardly from the shaft. rlhe shaft may be rocked by an arm 211 fixed thereon and pivoted at its Yupper end to the forwardend of a link 212,

which, at its rearward end, is pivoted to a shaft 76. J

ln said patent to Hart provision is made of means for locking the numeral-keys when the carriage reaches a substraction zone. According to the present invention, provision is made of carriage-controlled means for locking the numeral-keys when certain computing zones are reached, the mechanism for producing this result being, however, different from that disclosed by Hart. effect such locking, certain column-stops118 are provided with extensions 214 so positioned from front to rear as to pass between the

dogs

120 and 139 but to engage a dog 215 mounted on a lever 216 also mounted on pivot 122 to draw upwardly a link 217 and to rock a lever 218 connected at its forward end with the lever 213, so as to rock the latter and'effect locking ofthe numeralke s.

rylhe connection between the link 217 and lever 218 is effected by means of a shouldered screw 219 passing through an L-shaped Tov slot 220 in the link 217 and threaded into the lever 218, one branch of the L-shaped slot being horizontal and the other branch projecting downwardly from the forward end of the horizontal branch. Normally the shouldered screw 219 is held at the rear end of the horizontal branch of the slot,

and the link 217 is then effective to liftv 76, so that the lever 213 maybe operated to swing the finger 206 into effective position independently of the lever 218.

In order that the numeral-keys 16 may be unlocked after having been locked by the carriage as it reaches a computing zone, provision is made of means for unlocking the numeral-keys when the subtraction-setting mechanism is operated. To this end provision is made of a link 223 pivoted at 224 on the subtraction-bar 7 9 and supporting at its other end a pivot 225 of the lever 218,

' said pivot 225 extending through a slot 226 in a fixed bracket 227. When, therefore, the numeral-keys are locked, as shown in Figure 4, depression of the subtraction-key 72 causes the subtraction-bar 79 to be moved rearwardly by the spring 80 to lift, through the link 223, the forward end of the lever 218 and thereby release the numeral-keys from the locking means.

Provision is. also made for releasing the numeral-keys from the locking means by depression of the addition-key 147 or actuation of the non-compute key 177. Such release is effected in both cases by moving the link 217 rearwardly from its normal position to bring the upright branch of the slot 220 in the link 217 below the shouldered screw 219, so asA to free the rear end of the lever 218 from contro-l by the link 217. The positionof the link 217 is determined by means of a link 228 pivotally connected with thelower end of the link 217 by means of a set-screw 229 and pivoted at its forward end Figure 12, the end of the shaft 231 projects through the bracket 227, and provision is made of a spacer 232it to cause the lever 218 to clear the end of the shaft 231. The spacer 232a is heldin position by the pivot 225,

which may be in the form of a suitable screw. Fixed on the right-hand end of the shaft 231 are two

members

234 and 235 securedtogether by any suitable means, such as rivets 236, the member 234 having its upper end bent to the right, back of the lever 193, and the upper end of the member 235 having connected therewith a spring 237 to urge it forwardly, and, through the various connections, hold the link 217 inits forward position.

As previously described, the upper end of the lever 193 is swung rearwardly when the non-compute key 177 is actuated, and this movement is transmitted through the member,` 234 and other connecting parts to the link 217 to swing the same rearwardly to ineffective position. To. release the numeralkeysl by means of the'addition-key 147, provision is made of a slide 238 resting on the ceiling 170 of the computer, and having at its forward end a finger 239 embracing a pin 2.40 by which one end of the spring 174 is attached to the link 148. The slide 238 is guided near its rear end by a shouldered screw 241 projecting through a slot 242 therein, and threaded into the ceiling 170 of the computer-casing, said slide 238 being provided with a shoulder 243 to engage the upper end of the member 235 to rock the shaft 231 and shift the lower end of the link 217 rearwardly' to release the locked numeralposition, provision is made of an adjustment screw 247 connecting the upper end of the link 217 to the body thereof.

As indicated in Figures 1 and 3, the colorcontrolling link 104 normally overlies both the plunger 108. controlled by the subtraction-setting mechanism, and the cam 173 controlled by the addition-key' 147, the arrangement being the same as in said patent to Kupetz No. 1,452,162. lt will be seen that, due to this arrangement. typing may be effected in red outside of the computing zone by merely depressing the addition-key without changing the normal addition setting of the machine. In said Patent No. 1,452,162 the rearwardposition of the color-controlling link is determined by the rear end of a guide slot, but, according to the present invention, the slot 105, through which the link 104 passes, is extended rearwardly to enable the link to be drawn to the rear of the cam 173 vunder the urging of the spring 144 which surrounds the shaft 143.

The link 1 04 is, however, maintained in a proper normal position by" means of an arm 248 having a pin 249 thereon engaging 'an abutment in the form of a link 250 with an upper forked end embracing the shaft 143 pivoted at its lower end on the shouldered screw 229. The link 250 is, however, provided with a notch or recess 251 immediately beneath the normal point of contact of the pin 249 with the link, so that, when the link 217 is lifted to ,lock the numeralkeys, the link 250 is lifted sufficiently to bring the notch 251 opposite the pin 249, thereby permitting the arm 248 to be swung downwardly by ,the spring 144, and the color-changing link 104 swung rearwardly from the path of the cam 173, thus placing the color-changing mechanism entirely under the` control of the" subtraction-setting mechanism.

As indicated in Figure`3, the machine is set up for three different computing zones. 'Io this end the carriage 22 is provided with three suitably setdenomination-selectors 43 and with correspondingly set column-stops 118,.of which the one to the left is provided withl an extension 138 to cause the colorchanging link 104 to be advanced out ofthe path ofthe plunger 108 and placed under f the exclusive control of the cam 173 actuable by the addition-key 147, and with a shorter extension 214 to the front of the extension 138 and positionedto act-nate the key-lockingy mechanism through the link .217. The second column-stop 118 is provided only with an extension-214 to effect thelocking ofthe keys, and the third column-stop: 118 has no extension such as 138 and 214, and

therefore has no control of the key-locking engages the dog 215 and acts through the link 217 to lock the numeral-keys. The different parts will then be in the position indicated in Figure 4. If subtraction is to Ibe effected in this column, which is hereinafter referred to as the first, column, the subtraction-key 72 is c depressed.; and, as shown in Figure 5, the

state-signal link 116 is lifted to canse the S on the state-signal to be shown through thel opening 93 in the. black color field at the A sight-opening '94, and to cause the link 223 to be brought to a substantially vertical polsition,thereby lifting the forward end of the lever 218 to unlock the numeral-keys. After av number to be computed in the first column is typed, the general operator is 'automatically thrown into operation and the parts restored to their normal position, the extensions 138 and 214 of the columnstop havingat this time passed beyond the

dogs

139 and 215 and released the same.

If it is desired to add in the first column, the addition-key 147 is depressed and the color-signal shifted as shown in Figure 6, to show the A of the state-signal through the red field of the color-signal atithe sightopening 94. At the same time the slide 238 is moved rearwardly to rock the lever 193, and through the shaft 231 and link 228 to shift the link 217 rearwardly to the position shown in Figure 6, thereby permitting the shouldered screw 219 to drop in the vertical branch of the slot 220, and -permitting the forward fend of the lever 218 to be lifted to render the key-lock of the numeral-keys ineffective by withdrawal of the finger 20G from effective position.

'fter the typing in the first computing column has been completed, the carriage may .be tabulated in the usual manner to the second column, extension 214 on the corresponding column-stop acting as in the first column to lock the numeral-keys, and by upward shifting of the link 250 to permit the color-shifting link 104 to be swung rearwardly out of the path of the cam 173. as indicated in Figure 7. If it is desiredv to effect subtraction in the second column, the subtraction-key is first depressed, as shown in Figure 8, to release the subtraction.- bar, thereby effecting, through the link 223, a lifting of the forward end of the lever 218 to release the numeral-key lock and to effect, through the plunger 108, shifting of both thestate and color signals. The S indication of the statesignal will then be displayed through the red color-field of the color-signal to indicate red subtraction. Upon passage of the carriage out of the second computing Zone or column, the parts will be restored automaticallyto their normal-position.

1f it is desired to add in the second column, the addition-key 147 is depressed, as indicated in 'Figure 9, thereby actin r through the slide 23 shaft 231 and link 228 to swing the link 217 rearwardly to the position shown in Figure 9, and permitting the shouldered screw 219 to drop in the vertical-branch of the slot 220, thereby `effecting release of the' numeral-key lock. In this column, however, the color-controlling link is positioned ,to the rear of the cam 17 3, and consequently depression of the additioirkey has no effect on the colorchai'iging mechanism, so that both the state and color signals are in their normal positions, as indicated in Figure 9.

Inasmuch as the column-stop 118 for the third column lacks both projections or-eX- tensions214 and 148, there is no locking of the numeral-keys for this zone, and no shift-` ing of the. color-controlling link from its normal position. If, then, the subtractionsetting key is depressed, the machine is set,

machine is setfor subtraction at this time,

Sli

depression of the addition-key acts through lever 151, key-stem 158 and their associated parts to throw 'the general operator into operation tore-set the machine for addition, and through the cam 173 will eect a setting of the color-controlling link 104 to cause typing in red. By depression of the key 168, however, the carriage is merely set for black addition.

If it is desired to type numbers in the different columns Without computing, the machine may be set for this purpose by actuating the non-compute key 177 to shift the zone-controller 14.5 rearwardly to render the ,denominatioli-selecting mechanism ineffective, and, if the machine is in a computing zone for which locking of the keys is effected, the numeral-keys are released, as hereinbefore described, by means-of the pin 192 on the non-coinuite-- link 180 rocking the lever 193 to effect, through the shaft 231 and other connections, the rearward movement of the link 217 to ineffective position. Then the computing mechanism is thus rendered ineffective by'means of the non-compute key 177, the. color-changing mechanism, for which there is no direct manual control,`may

, be set, as desired, by means of the addition and subtraction keys.

- Variations may be resorted to Within the scope of the invention, and portions of the improvements may be used without others.

'Having thus described my invention, I

claim:

1. In a combined typewriting and com-v puting machine, numeral-keys, a carriage, carriage-controlled means for determining computing Zones, carriage-controlled means for locking the numeral keys When-the carriage reaches a computing Zone, an additionkey, and nieans actuable by said additionkey vfor releasing said\.niimeralkeys.

2. In a combine-:l typevvriting and computing machine, numeral-keys, a carriage, carriage-controlled means for determining computingzones, carriage-controlled means for locking the numeral keys When the carriage reaches a computing zone, an additionkey, a subtraction-key, and means. actuable by said addition-key or by said subtractionkey for releasing Isaid numeral-keys.

3.- In a combined typewriting and com- *putmg machine, numeral-keys, a carriage,

carriage-controlled means for determining computing zones, carriage-controlled means for locking the numeral-keys when the carriage reaches a computing Zone, an additionkey, a non-compute key, and means actu- 'able bysaid addition-key or by said noncompute key for releasing said numeralkeys.

4. In a combined typevvriting and computing machine, numeral-keys, a carriage, carriage-controlled means for determining computing zones, carriage-controlled means forV locking the numeral-keys when the carriageA reaches a computing zone, an additionkey, a. subtraction-key, a non-compute key, and means actuable by said addition-key, said subtraction-key or said non-compute key for releasing said numeral-keys.

5. In a -combined typeWriting and computing machine, a traveling carriage, an addition-key, a subtraction-key, color-changing mechanism normally sliiftable by actuation of either the addition-key or the subtractionkey, and carriage-controlled means for freeing said color-changing mechanism from control by said addition-key.

G. In a combined typewriting and computing machine, a traveling. carriage, an addition-key, a subtraction-key, colorchanging mechanism normally shiftable by actuation of eitheil the addition-key or the subtraction-key, land carriage-controlled means for freeing said color-changing mechanism from control by'said subtraction-key. 7. In a combined typewriting and computing machine, a traveling'carriage, -an addition-key, a subtraction-key, color- `changing mechanism normally shiftable by actuation of either the addition-key or the subtraction-key, and carriage-controlled means for freeing said color-changing mechanism from control by Said addition-key or from control by said subtraction-key.

8. In a combined typewriting and compitting machine, a traveling carriage, nu-

meral-keys, an addition-key, a subtractionkey, color-changing mechanism shiftable by 'actuation of either the addition-key or the subtraction-key, carriage-controlled means for locking said numeral-keys, means controlled bysaid locking means for freeing said color-changing mechanism from control by said addition-key,and .means actu- -trol by said addition-key, and means actu- CIJ im y

, key,

able by said addition-key for releasing said numeral-keys from said locking meansf 10. In al combined typewriting and computing machine, a traveling carriage, nu-

meral-keys, an addition-key, a subtraction-Y 11. In a combined typewriting and com-` puting machine, a traveling carriage, numeral-keys, an addition-key, a subtractiona non-compnte-key, color-changing mechanism shiftable by actuation of either the addition-key or the subtraction-key, carriage-controlled means for locking said numeral-keys, means controlled by saidlocking means for freeing said color-changing mechanism from control by said additionkey, and means 'actuable bysaid additionkey, `substraction-key or non-compute-key for releasing said numeral-keys Jfrom said locking means.

12. In a combined typewriting and computing machine, a carriage, numeral-keys, a subtraction-key, means controlledv by the carriage for locking the numeral-keys when the carriage reaches a computing zone, said locking means comprising a longitudinallyshiftable link, and a lever operable by said link and connected therewith by a pin projecting into aright-angle slot in the link and normally in the properbranch of the slot to provide an operative connection, and

means to effect relative displacement between the lever and the link to cause the pinto lie in the other branch of-the slot,

.thereby breaking the effective connection.

13. In a combined typewriting and computing machine, a carriage, numeral-keys, a subtraction-key, means controlled by the carriage for locking the numeral-keys when the carriage reaches a computing zone, said loc-king. means /comprising a lon itudinallyshiftable link, and a lever opera le by said link and connected therewith by a pin projecting into a right-angle slot in the link and normally in the proper branch of the slot to provide an operative connection, subtraction-key-actuated means for releasing said numeral-keys from said locking means, and means to eli'ect relative displacement between the lever and the link to cause the pin to lie in the other branch of the slot,

- thereby breaking the effective connection.

14. In a combined typewriting'and com'- puting machine, a-carriage, numeral-keys, a subtraction-key, an addition-key means controlled by the carriage for locking the ,nu-

meral-keys when the carriage reaches a computing zone, said locking means compris- .ing a longitudinally-shiftable link, and a lever` operablel by said link and connected therewith by a pin projecting.into a rightangle slot in the link and normally in the proper branch of the slot to Provide an operative connection, and addition-key-actuated means to effect relative displacement between the lever and the link to cause the pin to lie in the other branch of the slot, thereby breaking the eiective connection.

15. In a combined typewriting and com-I puting machine, a carriage, numeral-keys, a subtraction-key, an addition-key, a non-compute-keymeans controlled bythe carriage fonlocking the numeral-keys when the carriage reaches a computing zone, said locking means comprising a longitudinally-shiftable link, and a lever operable by said link and connected therewith by a pin projecting into a right-angle slot in the link and normally in the proper branch of the slot to provide an operative connection, and means actuable by said addition-key or said noncompute-key to eiect relative displacement between the lever and the linkl to cause the pin to lie in the other branch of the slot,

i thereby breaking the effective connection.

16. In a combined typewriting and computing machine, a carriage, numeral-keys, a subtraction-key, a non-compute-key, means controlled by the carriage for locking the numeral-keys when the ,carriage reaches a computing zone, saidlocking means( comprising a longitudinally-shiftable'V link, and a lever operable by said link and connected therewith bya pin projecting into a rightangle slot in the link and normally in the proper branch of the slot to provide an operative connection, and non-compute-key actuated means to eect relative displacement between the lever and the link to canse'the pin to lie in the other branch ol' the slot, thereby breaking the effective connec'tion.

17. In a combined typewriting and computing machine, a carriage, addition-setting mechanism, subtraction-setting mechanism, color-changing ymechanism normally under the control of said addition-setting mech-' anism and said subtraction-setting mechanism, and carriage-controlled means for freeing said color-changing mechanism from control ol either said addition-setting mechanism or said subtraction-setting mechanism and placing it under the exclusive control of the other of said mechanisms.

18. In a combined typewriting land computing machine, a carriage, numeral-keys, addition-setting mechanism, subtraction-setting mechanism, color-changing mechanism normally under the control of said additionsetting mechanism and said subtraction-setting mechanism, carriage-controlled means anism and Iplacin l ,ber

for freeing said color-changin mechanism from control of either said ad ition-setting mechanism or said subtractionsetting mechitunder the exclusive control of the ot er of said mechanisms, and numeral-key-locking means settable by said carriage upon reaching a computing zone, and 'releasable by actuation of either said addition-setting mechanism or said subtraction-setting mechanism.

19. In a combined typewriting and computing machine, numeral-keys, a carriage, carriage-controlled means for determining computing zones, carriage-controlledmeans, including a train of connections, for locking the numeral-keys when the carriage reaches a computing zone, an addition-key a subtraction-key, addition-key-actuated means for rendering said train of connections ineifective at one point, and subtrac-` tion-key-actuated means for rendering said train of connections ineffectiveat another point.

20. Ina combined typewriting and computing machine, numeral-keys, a carriage, carriage-controlled meansV for' determining computing zones, carriage-controlled means, including a train of connections, for locking the numeral-keys when the carriage -reaches a computing zone, an addition-key, a sub- -traction-key, a non-compute-key, subtraction-key-actuated means for rendering said train of connections ineiective at one point, and means actuable either by said addition keg,7 or by saidnon-compute-key for rendering said train ofconnections ineffective at another point. f

2l. In a combined typewriting and computing machine, numeral-keys, a carriage, carriage-controlled means 'for determining computing zones, carriage-controlled means, including a train of connections, for locking the numeral-keys when the carriage reaches a computing zone, a subtraction-key, a non-compute-key, subtraction-key-actuated means for rendering said train of connections ineffective at one point, and subtraction-key-actuated means ror rendering said train of connections ineffective at another point.

22. In a combined typewriting and computing machine, a traveling carriage, colorchanging mechanism normally set for vone co or means including a reciprocable memanism, subtraction-setting mechanism in cluding an actuating member for said reci-` procable member, addition-setting mechaanism including a second actuating member Areciprocable member in position to be enf said abutment to release said arm and -abutment to release said shaft for shifting said color-changingrmechsaid link, subtraction-setting mechanism in! cluding a second lifter under said link, means including a swingable arm connected to said link and a spring, to urge said link out of the path of the first lifter, a shiftable abutment to obstruct said arm and hold said link against the action of said urging means and carriage-actuated means to shift ermit movement of the link out of the rigath of the irst lifter.

24. In a Combined typevvriting and com` puting machine, a carriage for determining computing zones, color-changing mechanism including a pendent link, addition-y setting mechanism including a lifter under said link, subtraction-setting mechanism including a second lifter under said link, means for urging said link out of the path of the addition-setting lifter, including a rock-shaft and a spring to rock said shaft, means to restrain said shaft comprising an arm fixed thereon, a pin projecting laterally from said arm, and a slidable abutment normally engaging said pin and having a -notch to permit release of the shaft when the notch is brought opposite said pin, and carriage-actuated means for" shifting said to the action of said spring.y

25. In a ,combined typewriting and computing machine, a carriage, numeral-keys, addition-setting mechanism, subtraction-setting mechanism, color-changingrmechanism normally under control of both said additionsetting and said subtraction-setting mechanisms, means including a sprin for destroying such control by one of said setting mechanisms, means normally restraining said control-destroying means, numeral-keylocking means, carriage-controlled means effective upon reaching a computin zone for rendering said locking means eective and' concomitantly renderingA said restraining means ineffective, and means actuable either by(` said addition-setting mechanism or by said subtraction-settin mechanism to release said numeral-keyocking means without changing the control of said colorchanging mechanism.

26, In a combined typewriting and comn puting machine, a carriage, numeral-keys, addition-setting mechanism, subtractionsetting mechanism, color-changing mechamsm normally under control of both said addition-setting and said subtraction-setting mechanisms, means including a s rin :for destroying such control by one o sai setting mechanisms, means normally restraining said control-destroying means, numeralkey-locking means, carriage-controlled means eective upon reaching a computing zone for rendering said locking means effective and concomitantily rendering said restraining means ine ective, carriage-controlled means effective upon reaching another computin zone for rendering said locking means e ective and overcoming such spring to destroy the control olf' the setting mechanism which the spring tends to establish, and means actuable either by said addition-setting mechanism or by said subtraction-setting mechanism to release said keylocking means for each of said zones. l

27. In a combined typewriting and computing machine, a carriage, numeral-keys, numeral-key-locking means, and carriageactuated means for rendering said locking means effective, comprising a lono'itudinallyshiftable link having an L-shaped slot, and a member having a pin projecting into said slot to eiect an operative connectionl when the pin is in one branch of the slot and 'tol render the connection ineiective when in the other branch of the slot.

28. In a combined typewriting and computing machine, a carnage, numeral-keys, numeral-key-locking means, an additionkey, a subtraction-key, bichrome mechanism controllable by said addition-ke or vsaid subtraction-key, and a link shi able upwardly by the carriage to change the control of the bichrome mechanism and to render thelocking means operative, and' shiftable in another direction to release said key-locking means without changing the control of said bichrome mechanism.

29. In a combined typewriting and computing machine, a carriage, numeral-keys, means for locking said numeral-keys, and means actuable by said carria e to render said locking means effective an comprising a link adjustable as to length.

30. In a combined typewriting and computing machine, a carriage, numeral-keys, numeral-key-lockin means, means ineluding a link liftable y the carria e for rendering said locking means e ective, loichrome mechanism, a link for controlling said bichrome mechanism, two actuators for said controlling link, means to place the controlling link under the control of one or the other of said actuators and including a shaft, a spring tending to shift in one direction an arm fixed on the shat and having a pin projecting laterally therefrom, and a link slotted to embrace said shaft and connected'at its lower end t the key-locking link to be lifted and lowered therewith and having a suitably positionednotch, so that when the key-locking link is in its lower position the pin will rest against the slotted link and will be held against actuation by the spring, and when the keylocking link is in raised or effective position the notch in the slotted link will be opposite said pin and the shaft will be released.

3l. In a combined typewriting and computing machine, a carriage, numeral-ke s, an addition-key, a subtraction-ke ichrome mechanism controlled by sai addition-ke and said subtraction-key, numeral` key-loc ing means, and carriage-actuated means including a link for rendering the locking means effective, and changing the control of said bichrome mechanism, and a second link for changing the control of said bichrome mechanism independently of said locking means.

32. In a combined typewriting and computing machine, a carriage, numeral-keys, a numeral-key-lock, an addition-key, a subtraction-key, bichrome mechanism controllable by said addition and said subtractionkeys, and carriage-controlled means elective in one zone for rendering said lock effective and placing the bichromemechanism under the control of the addition-key.

and in another zone for rendering the lock effective and placing the bichrome mecha- 1iism under the control of the subtraction- 33. In a combined typewriting and computing machine, a carriage, a rock-shaft urged in one direction by al spring, an arm on said shaft and having a `laterally-projecting pin, and a member slotted to embrace said shaft and serving as an abutment to be engaged by said pin in restraining the movement of the shaft and being rovided with a notch to release said 1n when brought opposite the same by shifting the slotted member.

HENRY L. PITMAhT Witnesses:

Manton R. MCCAFFREY, Jnnm P. THORNE.