US2506337A - Cover section for oscillating type wheels - Google Patents

Description

1950 R. E. BO'YDEN 2,506,337

COVER SECTION FOR oscnmrmc TYPE mums Original Filed larch 13, 1945 v 8 Sheets-Sheet 1 mmvrok 20552;" f. Boa 051v kw/w May 2, 1950 R. s, BOYDEN covm SECTION FOR OSCILLATING TYPE WHEELS Original Filed larch 13, '1945 s Shee ts-Sheet 2 INVENTOR. Poster 5 50mm rap/v5) y 50 R. 5 BOY-EDEN 2,506,337

COVER SECTIOE FOR OSCILLATING TYPE WHEELS Original Filed March 13, 1945 8 Sheets-Sheet 3 INVENTOR. P055127 5. Bows/v May 2, 1950 R. a BOYDEN COVER SECTION FOR OSCILLATING TYPE WHEELS Original Filed larch 13, 1945 a Sheets-Sheet 4 V QNN if INVEN TOR. P055275 50mm 8) May 2, 1950 R. r; BOYDEN COVER SECTION FOR OSCILLATING TYPE WHEELS 8 Sheets-Sheet 5 Original Filed llarch 13, 1945 R m m m Ear/Pr 5 50mm BY ZCM/ ATTOlP/Vf) R. E. BOYDEN COVER SECTION FOR OSCILLATING TYPE WHEELS May 2, 1950 Original Filed larch 13, 1945 uvvszvrox Paar/er 5. 50mm ATTOP/l/EY May 2, 1950 R. E. BOYDEN COVER SECTION FOR OSCILLATING TYPE WHEELS 8 Sheets-Sheet 7 Original Filed March 13, 1945 INVENTOR. P055122 5 50mm Z MM ATwPNEY y 2, 1950 R. E. BOYDEN 2,506,337

COVER SECTION FOR oscnu'rmc rm: WHEELS Original Fqe'd March 13, 1945 a Sheets-Sheet a FIE- ll mmvrm P255127 5 50mm BY .AT 0PNEY Patented May 2, 1950 COVER SECTION FOR OSCILLATING TYPE WHEELS Robert E. Boyden, Los Angeles, Calif., assignor to Clary Multiplier Corporation, Los Angeles, Calii., a. corporation oi California Application November 26, 1946, Serial No. 712,384

7 Claims. 1

This invention relates to calculating machines or the like and has particular reference to machines commonly known as adding machines. However, it is to be understood that at least certain phases of the invention may be applicable to other types of machines which incorporate mechanism for impressing on a paper tape a record of values set up in the machine.

One object of the present invention is to provide a cover which effectively encloses the operating parts of a machine of the above type, particularly a printing mechanism.

Another object is to predominately display the last value printed by a machine of the above type.

The manner in which the above and other objects of the invention are accomplished will be readily understood on reference to the following specification when read in conjunction with the accompanying drawings, wherein:

Fig. 1 is a plan view of a machine embodying a preferred form of the invention.

Fig. 2 is a longitudinal sectional view with parts broken away, of the machine.

Fig. 3 is a sectional view similar to that of Fig. 2 but illustrating the machine in a phase partly through its operation.

Fig. 4 is a side view of the rack drive cams and cam follower.

Fig. 5 is a side elevational view illustrating the clutch and switch controls.

Fig. 6 is a side view of the controls for the accumulator and part of the controls for the platen feed mechanism.

Fig. '73s a view similar to Fig. 6 but illustrating the mechanism conditioned for a sub-total operation.

Fig. 8 is a side view illustrating the rack lock, rack drive and right side motor controls.

Fig. 9 is a side view of the platen feeding mechanism.

Fig. 10 is a fragmentary side view illustrating the platen ratchet feed pawl at the end of its stroke.

Fig. 11 is a side view illustrating the printer control shaft operating device.

The present invention is disclosed in connection with a motor operated, key controlled, adding machine of the type disclosed and claimed in the copending application of Robert E. Boyden, Serial Number 582,553, filed March 13, 1945, and entitled Calculating machine. The present application is a continuation in part of said copending application and reference is hereby made thereto for an understanding of details of the machine not specifically disclosed herein.

Referring in general to Fig. 1, an amount to be added or subtracted is entered in the machine by depressing appropriate amount keys 9. In order to add this amount, one or the other of two add bars 10 and II is depressed. This amount is then added into an accumulator and is also printed on a paper strip (not shown) fed over a platen l2. If the amount set on the keys 9 is to be subtracted from an amount stored in the accumulator a minus bar I3 is depressed.

If it is desired to print an amount set up on the keys 9, but not to add the same in the accumulator, a non-add" bar I! would be depressed. If it is desired to add the same amount in the accumulator two or more times, as is generally done in multiplying, a repeat bar I! is depressed and held down until the requisite number of additions are made by the machine.

If a wrong amount is set up on the keys 9, the keyboard may be cleared by depressing a "correcti'on bar l6 which releases the keyboard without starting the motor.

When it is desired to obtain the total of a number of additions or the net total value of additions and subtractions entered into the accumulator, a total bar I! is depressed. This will print the total and will clear the accumulator to zero so that it will be in condition to total a subsequent series of additions and/or subtractions. In the event it is desired to obtain a sub-total, a "sub-tote. bar I8 is depressed.

Keyboard The keyboard is of the flexible type, and each amount key 9 (Figs. 1 and 2), when depressed, serves as a stop to limit the movement of an aligned drive rack l9 which both drives the accumulator to enter therein a value corresponding to the value of the depressed key and also sets the printing mechanism to print the said value.

Each of the keys 9 comprises a key top 28 of plastic or similar material and a key stem 29 guided in aligned slots formed in a top plate 21 and a bottom frame plate 2|. The keys in each bank are yieldably pressed upward by a tension spring 32 extending the length of the keyboard and suitably attached at opposite ends to the plate 21. Said spring rests upon cross ribs 33 formed across slots 34 in the plate 21 and extends in openings in each of the key stems. Upon depression of a key, the adjacent portions of the spring are stretched and extend downwardly through the slots 34.

Means are provided for locking the keys 9 in their depressed positions and for releasing any depressed key. ,Each key stem has'a cam lobe (not shown) formed thereon which, when the key' is depressed, rockm locking bail 38 pivoted at either end thereof to the front and rear walls of the key frame 2| by trunnion bearings 39 and 40. At the end of its stroke, the cam lobe on the key passes below the bail, enabling the latter to retract partially under the action of a spring (not shown) to a position where it latches the key depressed.

A zero stop 42 is attached to each locking ball 38, and when no key 9 in any one order is depressed, the ball 38 of that order will be spring held in an extreme inwardly rocked position in which the zero stop lies directly in front of one of the steps of the associated rack l9, therebypreventing any substantial forward movement of the rack during subsequent phases of operation of the machine. However, when any amount key is depressed and latched down, the locking bail will be held outward sufficiently to retain the associated zero stop out of the path of the aligned rack.

Referring to Figs. 6 and 8, the stems of the various control bars H and I3 to la, inclusive, are also slidably mounted within the key frame 2| and plate 21. Two control bar stems of the bar l (one of which is shown at 58 in Fig. 2) slide yertically within aligned slots formed in the plate 21 and brackets 41, the latter being secured by screws 48 to the frame 2|.

Drive Referring to Fig. 5, the drive shaft 52 of the motor (not shown) is entrained with a main drive shaft through a gear train comprising a pinion 53 on the motor shaft, which pinion meshes with an idler 54 having a pinion 55 secured thereto and meshing with a gear 58 rotatable on shaft 5| and suitably connected to the driving side of a cyclic clutch generally indicated at 51, the driven side of which is secured to the shaft 5|.

Since cyclic clutches suitable for the present purpose are well-known in the art it is not deemed necessary to describe the same in detail.

'The clutch is controlled by a dog 58 fulcrumed at 59 and arranged to effect engagement of the clutch upon counter-clockwise rockin movement thereof away from the clutch. Disengagement of the clutch is effected by rocking the dog 58 clockwise into the position illustrated in Fig. 5.

Means are provided for yieldably transmitting a drive from the shaft 5| to the various drive racks 19, Fig. 2, located in the different orders of the machine. Referring to Figs. 4 and 8 in particular, a pair of juxtaposed complementary rack drive cams 80 and BI are keyed to the shaft 5| adjacent the right-hand end thereof. These cams are engaged by rollers 62 and 63, respectively. mounted on a cam follower plate 64 stradrlling the shaft 5| and pivoted on a cross shaft 8|. A link 56 is pivotally connected between the lower end of the cam follower plate 84 and an arm 61 secured to a rock shaft 68 which is ,iournalled in bearings (not shown) formed in the machine frame plates. The arm 61 is bifurcated to embrace a roller 69 journalled on one end of a rack drive shaft 10. The roller 69 also is guided for transverse movement within a longitudinally extending slot 1| in the machine frame plate 23.

A roller 12 (Fig. 2) on the opposite end of the shaft is guided along an elongated slot 13 (similar to slot 1|) in the left-hand machine frame plate 24 and a second arm (not shown) 4 similar to arm 61 is fixed to the shaft 58 to guide the left-hand end of shaft 10 and thereby insure parallel movement of the latter during its transverse shifting movement.

Referring to Fig. 2, each of the drive racks I9 has an elongated slot 130 therein embracing the shaft 18 whereby to support the forward end of the rack. The slot 130 terminates in opposed lateral depressions 14 at its closed end. Each of these depressions 14 is normally engaged by a roller 15 carried by a pawl or drive element 15 which is rockably fitted within a groove in the shaft 10. The adjacent drive elements 16 associated with any one rack l9 are spring urged in opposite directions about shaft 10 by a tension spring 11 connected between the tails of the two elements, thus forming a yieldable connection between the shaft 10 and the respective drive rack l8.

When, during the forward movement of the shaft 10, a particular rack I9 is stopped due to striking a depressed key stem 28, or the associated zero stop 42 or a stationary nine" stop 428, the rollers 15 will ride out of the depressions 14 against the action of spring 11, thus breaking the connection between the shaft and rack.

Referring to Figs. 2 and 3, each rack I8 is provided with equally spaced shoulders 19, the spacings of which are slightly larger than the spacings of the keys 9 so that the rack, when advanced toward the front of the machine, will strike the lower end of a depressed key after it has been moved a number of increments equal to the value of the depressed key. In the event a nine amount key has been depressed the rack will not be stopped thereby but will continue until the second shoulder 19 from the front thereof strikes the "nine stop 42|l attached to the forward wall of the key frame 2|.

Each rack, in addition to being guided by the shaft 10, is provided with a slot 88 adjacent the rear end thereof which is guided over the stationary cross rod 8| extending between the machine frame plates.

A rack gear section 82 is formed on the upper edge of the racks for the purpose of meshing with one of a series of gears operatively connected with the printer mechanism as is disclosed in detail in said parent application. Also formed on each rack i9 is a pair of opposed rack gear sections 83 and 84 disposed on opposite sides of an associated accumulator gear or element 85 rotatably mounted on an accumulator shaft 86 forming part of the accumulator unit.

A series of notches 81 are formed on the under forward edge of each rack l9 and are spaced apart distances equal to the different increments of movement of the rack. These notches are adapted to be engaged by a locking ball 88 before and after both the forward and the return movements of the rack. For this purpose, the locking ball is pivoted at opposite ends on frame pins 42| and is connected by means of a link 422 (Fig. 8) to a cam follower 423 pivoted on a shaft 8| and carrying rollers 424 and 425 which ride on complementary cams 426 and 421, respectively,

keyed on shaft5l.

Accumulator Since the accumulator unit does not in itself relate to the present invention the details thereof are omitted herein. However, reference may be had to said parent application or to Patent No.

15 2,472,696 issued to Edward P. Drake on June 7,

swam

1949, for the details of an accumulator applicable 4 I the machine.

'mesh the gears 85 with the lower rack gear sections 84 whereby the gears will be rotated in a clockwise direction during the subsequent forward rack movement-while, during a subtractive operation, the'accumulator is raised to mesh the gears 85 with the upper rack gear section 83 so that the subsequent forward rack movement will drive the gears in a counter-clockwise direction.

The shafts 86 and 81 (Figs. 6 and 7), forming part of the accumulator unit, are guided at opposite ends thereof in vertical slots 9| and 92, respectively (Fig. 7), formed in plates 93 suitably attached in a manner not shown to the machine frame side plates.

For the purpose of raising and lowering the accumulator unit in accordance with the type of problem being performed, a box cam 94 (Fig; 6) is pivoted on a frame stud 95 and has a cam groove 96 therein embracing a roller 91 rotatably mounted on the shaft 86 at the left-hand end thereof. Clockwise rocking movement of the cam 94 in a manner to be described hereinafter will lower the accumulator to its additive position, while counterclockwise rocking thereof from its illustrated position will raise the accumulator to its subtractive position.

Printer The printer (Figs. 2 and 3) comprises a series of numeral printing dials or elements I35, one for each of the drive racks I9. Each numeral dial has thereon a series of type ranging from zero to nine and these dials are so connected to the associated racks that they will print a digit corresponding to the value of the key depressed in the associated key bank or to the numerical position to which the rack is moved in its forward stroke.

Each dial I35 is rotatably mounted on a separate lever I36 which is loosely keyed on a printer control shaft I31 and spring-urged clockwise by a tension spring I38 extended between the lever I 36 and a suitable portion of the frame. Each dial I35 has secured thereto a gear I39 perma nently meshed with a gear I40 also rotatably mounted on the associated lever I36. When a lever I36 is held in its normal position illustrated in Fig. 2 by the shaft I31, the gear I40 is meshed with an aligned one of a series of large idler gears I4I rotatably mounted on a cross shaft I42. The latter idlers are continuously entrained with respective ones of the drive racks I 9 through a series of pinion assemblies, the details of which are not deemed necessary to disclose herein.

At approximately the mid-point in a machine cycle, and after the racks have digitized the accumulator and printer, the printer control shaft I31 is rocked clockwise permitting the springs I38 to rock the printer arms I36 and thus carry the printing dials I35 forward into contact with a printing ribbon I44 and the paper strip (not shown) which is carried on the platen I2, whereby to print the number registered on the dials onto the paper at the printing station. The printing ribbon extends parallel to the platen I2, and is adapted to be contacted by any of the printer dials I35.

Referring to Fig. 11, the shaft I31 is fastened to a lever I45 urged clockwise by a strong tension spring I46 and provided with a roller I41 held against a camming lever assembly I48. The latter is pivoted on the cross rod 8I and has a roller I50 on the lower end thereof which rides on the periphery of a cam I5I -keyed to the drive shaft 5|. The latter is so arranged that as the machine passes through approximately of its cycle, the spring I46 is permitted to rock the shaft I31 clockwiseto effect the printing.

Means are provided to prevent printing of zeros to the left of the highest significantdigit being printed while enabling all zeros to the right thereof to be printed. For this purpose a latch I52 (Figs. 2, 3 and 6) is provided adjacent each lever I36 and is journalled on a cross rod I53 extending through cam slots I54 in the various idler gears I 4I. The levers I52 are urged clockwise by tension springs I55 extending between the levers and a cross rod I56, and are provided with ears I51, each adapted to normally overlie a foot I58 extending forwardly from an aligned lever I 36. A roller I59 rides in the cam slot I54 and when the associated idler I H and printing dial I35 are retained at zero position the contour of the cam slot enables the spring I55 to rock the lever I52 to its fullest extent as illustrated in Fig. 2 wherein it overlies the foot I58 of lever I36 and thus prevents the latter from being rocked during the printing operation. However, when any idler gear MI is rotated to its one or any other position its cam slot will rock the associated lever I52 outwardly to the position illustrated in Fig. 3, thereby enabling the associated lever I36 to be subsequently rocked into printing position. Each of the latch levers I52 is provided with an ear I60 overlying the corresponding ear on the lever to the left. Therefore, when any latch lever I52 is rocked outwardly by its gear I M all of the levers I52 to the right thereof will likewise be rocked outwardly by virtue of the overlapping ears I60.

In order to hold the various gears in registered positions during the time that the associated gears I40 are demeshed therefrom, a locking bail 430 is provided, extending across the various gears HI and normally engaged between two of the teeth of each thereof. The bail is pivoted on frame studs 43I (Fig. 8) and is provided with a pin 432 connected to a, second ball by a, spring 434 which normally holds the pin 432 thereagainst. Bail 433 is pivoted on a frame stud 435 and is pivotally connected by a pin and slot arrangement 436 to the hereinbefore mentioned link 422.

Means ,are provided for retaining each printer dial I35 in its registered position after the gear I40 entrained therewith is demeshed from its idler I4I. For this purpose a centralizer pawl I6 I (Fig. 2) is pivoted at I62 on the associated lever I36 and has a, tooth I63 adapted to engage between two adjacent teeth of the dial gear I39. A tension spring I64 extending between the pawl and the lever urges the pawl toward engagement with the gear. However, when the printing levers are in their normal positions illustrated in Fig. 2, a tail on each of the pawls engages a stationary cross bar I65, thus holding the pawls out of engagement with the gears I39. During the printing operation,'and when the levers I36 are rocking clockwise, the pawls I6I recede from the rod I65, thus enabling the springs I64 to rock the latter into engagement with their respective gears I39. In order to insure engagement thereof with the gears I39, a second stationary rod I66 is located above the tails of these pawls so that as the levers I36 carr the latter upwardly and rearwardly, the tails strike the rod I66 and are positively forced .in a counter-clockwise direction toward pawling positions in case the springs I64 are insuflicient to do so soon enough.

Clutch controls Operation of the machine and engagement the clutch 51 (Fig. is effected by depressing any of the various control bars except the cor-- rection bar l'6 (Fig. 1).

Referring to Fig. 5 in particular, the clutch control dog 58 is connected by a pin and slot arrangement 221 to a clutch control bar 228 supported for longitudinal movement by a, pair of parallel links 229 pivotally supported on frame pins 238. The bar 228 has four cam slots 23! formed therein, each of which underlies a pin 232 carried on a lever 233 pivoted on a frame pin 234 and urged upwardly by a tension spring 235 extending between the pin 232 and a frame stud 236. The pins 232 underlie the minus, non-add, sub-total and total bar stems l3, l4, l8 and I1, respectively. Therefore, depression of any of these bars will cause the associated pin 232 to cam the clutch control bar 228 forwardly to effect engagement of the clutch 51.

Provision is also made to effect engagement of the clutch upon depression of either of the add bars l0 and H and the repeat bar l5. Referring to Fig. 8, bellcranks 238 and 239 are pivoted on frame pins 240 adjacent the add bar II and repeat bar I5, respectively. Pins 24l mounted on the bellcranks 238 and 239 underlie the stems of the associated bars. A pin 242 carried at the upper end of bellcrank 239 fits within a slot formed in a control link 243 pivoted to an arm 244 which is attached to a shaft 245 pivotally mounted in flanges 246 (Fig. 2), extending upward from the brackets 41.

Arms 241 attached to the shaft 245 carry a rod 248 which extends over a camming contour 249 (Fig. 5) formed on the control bar 228. Upon depression of the repeat bar l5, its bellcrank 239 will be rocked counter-clockwise against the action of a spring 25! tensioned between the pin 242 and a frame pin 252 thereby forcing the link 243 forward to lower the rod 248 and thereby cam the clutch control bar 228 forward.

The bellcrank 238 (Fig. 8) also has apin 253 thereon overlying a shoulder 254 on the link 243, so that depression of the add bar II will rock the bellcrank 238 against the action of a spring and likewise force the link 243 forwardly.

Operation of the clutch dog 58 also causes closing of a normally open motor switch generally indicated at 385 (Fig. 5). A switch operating lever 386 is pivoted on a frame pin 381 and overlies an ear 388 on the clutch dog 58 so that counter-clockwise rocking of the latter to engage the clutch will rock the lever 386 against the action of a, spring 389 to permit a switch plunger 39I to be spring operated downwardly in a manner not shown to close the motor switch.

Accumulator control As also stated under the heading Accumulator, the accumulator is raised or lowered to mesh the accumulator gears 85 (Fig. 2) with either the upper rack gear sections 83 or the lower gear sections 84 of the drive racks depending upon the type of operation to be performed. For this purpose, mechanism is provided which is under control of the different control bars for determining and effecting the positioning of the accumulator.

The hereinbefore described box cam 94 (Fig. 6) carries a pair of pins 251 and 258 arranged on opposite sides of the frame pin 86. These pins are adapted to be selectively engaged by a hook member 259 connected to a three-armed cam follower 268 pivoted on the shaft 6|. The cam follower is urged counter-clockwise by a spring 26l tensioned between one arm ofthe cam follower and a frame pin 262 to press a roller 266 on another arm thereof against a earn 264 keyed on the drive shaft 5|. Cam 264 has a high portion extending over substantially half of its periphery whereby to rock the cam follower 268 and thereby position the hook member 259 rearward during approximately the first half of a machine cycle. Normally, during additive operations or when the machine is at rest, the hook member 259 is raised by a tension spring 265, whereby a slot 266 therein embraces the upper pin 251, so that as the hook is moved rearward it will rock the cam 94 clockwise to lower the accumulator into its additive position.

For the purpose of locating the hook member 259 in a lowermost or an intermediate position, a control bar 261 is provided, being supported for longitudinal movement by a pair of parallel links 268 pivotally supported by frame pins 269. The bar 261 has four camrning surfaces 219 formed thereon and underlying the various aforementioned pins 232 operable by the different control bars on the left-hand side of the machine. The bar 261 is connected by a pin and slot arrangement 21! to a bellcrank 212 pivoted on a frame stud 213 and having a pin 214 on the opposite end thereof which is embraced by a slot formed in the hook member 259.

The camming surfaces 218 of bar 261 are so arranged that upon depression of the minus bar l3, the total bar l8 or the sub-total bar l1, the control bar 261 will be moved forwardly its fullest extent which, throughthe bellcrank 212, will lower the hook member 259 until a slot 215 therein embraces the pin 94 so that subsequent rearward movement of the hook member will place the accumulator into its upper subtractive position. The contour of the camming surface 210 underlying the non-add bar I4 is such that depression of this bar will move the control bar 261 only half way through its stroke so that the hook member 259 will be located in an intermediate position in which neither slot 266 or 215 will embrace its associated pin on the cam 94 and consequently will not effect rocking of the cam 94 during operation of the machine.

During an additive or subtractive operation, and after the high portion of cam 264 has passed by the roller 263, the spring 26! will become effective to return hook 259 and cam 94 to their positions illustrated in Fig. 6.

In order to maintain the box cam 94 in its .neutral position illustrated in Fig. 6 when it is and subtraction operations, while in sub-totaling 15 during the first part of the cycle and is then I operations, the accumulator is returned to zero again reset at its former accumulated value during the latter part of the cycle. Therefore, it is necessary in the latter operation to maintain the accumulator in mesh with the drive racks I9 until the latter have returned from their forward strokes. To this end, a second cam I219 is mounted on the shaft I adjacent the cam 264 and is provided with a high portion around the greater part of the periphery thereof. This cam engages theroller 288. (Fig. '7) of a second bellcrank 28I also pivoted on the shaft 8I adjacent the cam follower 268. A slot 282 is formed in the rearwardly extending arm of bellcrank 28I which is co-extensive with a slot 283 formed in the cam follower 268. However, it will be noted that the rearward extension of the bellcrank 28I is somewhat shorter than the similar extension of the cam follower 288. A pin 284 carried by a link 285 rides within one or both of the slots 282'and 283 depending on its position longitudinally of the machine. The link 285 is connected to the lower arm of thelever 233 which is associated with the sub-total bar I8 and is so arranged that when the bar I8 is in a raised position, as indicated in Fig. 6, the pin 284 will be located solely in the slot 283 of cam follower 268. However, upon depression of the bar I8 as indicated in Fig. 7, the pin 284 will be moved forwardly to locate within both the slot 283 and the slot 282. In this condition, 1. e. during a sub-totaling operation, the two members 288 and 28I will move as a unit and the cam I219 will therefore, through the hook member 259, hold the accumulator engaged with the drive racks throughout the major portion of the cycle.

During totaling and sub-totaling operations, the keyboard is not utilized to control the extent of movement of the racks I9 but instead the racks are controlled by the various accumulator gears in returning from their accumulated increments of rotation to their zero positions. For this purpose, zero stop elements (not shown) are mounted on the lower shaft 81 associated with the accumulator. During totaling and sub-totaling operations the shaft is rocked counter-clockwise carrying the zero stop elements into blocking relation with zero stop teeth (not shown) mounted on the gears 85.

The shaft 81 and zero stop elements are rocked by power under control of the bars I1 and I8, and in order to accomplish this an arm 288 (Figs. 6

'and 7) is keyed to the shaft 81 and is connected through a pin and slot connection 289 to a floating lever 298 which rides on the stationary frame pin 211. The forward end of lever 288 is pivoted to the lower end of a link 292, the upper end of which is pivotally connected to a cross link 293 intermediate its ends. The link 293 is pivotally connected to the pins 232 underlying the stems of the bars I1 and I8. Upon depression of either of the bars, the link 292. will be lowered sufficiently to rock the lever 298 counter-clockwise about the pin 211 to position a hook 294 thereon in the path of a pin 295 carried by the cam follower 28I so that as the latter is rocked at the beginning of a total or sub-total operation the pin 295 will drive the lever 298 forwardly, rocking the shaft 81 against the action of a spring to likewise rock the zero stop levers into blocking position. Thus, as the machine continues its cycle the racks will be driven forward, rotating the accumulator gears 85 in a subtractive direction until they are stopped in their zero positions. The racks will therefore stand in positions mechanically representing the value previously registered by the accumulator of printing dials I to Platen feed The record medium, in the form of a paper strip or tape on which the factors and results of computations are printed, is fed at certain increments past the printing station or point by the platen I2 (Figs. 1, 2, 3, 9 and 10).

In order to insure intimate driving contact between the paper and the platen, a guide member 298 (Figs. 2 and 3) is provided having the upper surface thereof conforming substantially to the contour of the platen. The member 298 is pivotally supported at 298 in a suitable manner (not shown) to machine frame plates and it is urged clockwise toward the platen by a spring 299 tensioned between the member and a suitable portion of the frame, so as to impress a roller 291 carried by the member 296 against the paper strip. A pair of fingers 388 extend upwardly from the member 296 on either side of the group aid in guiding the strip upwardly.

The paper is carried in a roll (not shown) located in the rear of the machine and is arranged to guide the paper onto the underside of the platen I2.

A stationary paper tear-off bar 38I' extends across the upper tips of the fingers 388. The bar forms a severing device for the purpose of severing the paper strip which is passed thereunder whenever the strip is pulled outwardly thereagainst.

The platen I2 is normally rotated one increment after each printing operation but when taking totals or sub-totals it is rotated three increments so as to locate such values above the tear-01f bar 38I. For this purpose, a ratchet 382 (Figs. 9 and 10) is attached to the platen I2 and is fed by the upper ear of a pawl 383 pivotally connected at 384 to a cam follower 385 pivoted on the shaft 8I. The lower end of the cam follower carries a roller 386 engaging a cam 381 keyed on the shaft 5|. The upper end of pawl 383 is urged tothe left by tension spring 388 extending between the pawl and a control lever 389 which is pivoted on a frame stud 3I8. A pin 3, also mounted on the control lever 389, presses against the side of the pawl 383. The leverage ratios involved between the spring 388, the pawl 383, and the lever 389 are so arranged that the pin 3I I will normally press the pawl rearward into the fullline position illustrated in Fig. 9, this outward movement being limited by a frame stud 3I2 against which the lever 389 normally rests. During operations other than totaling and sub-totaling the pawl 383 will be moved downwardly by the cam 381 against the action of spring 388 while riding against the pin 3 until the upper ear on the pawl strikes a ratchet tooth -in the position indicated at 382a. Further downward movement will rotate the ratchet one tooth before the pawl reaches the end of its stroke. At this time, a diagonal shoulder 3I4 will strike a frame pin 3I5 thereby wedging the ear of the pawl against the ratchet 382 as illustrated in Fig. 9 to prevent overthrow of the ratchet and platen.

A centralizer arm 3I6 is pivoted on the frame pine 3I5 and is urged clockwise by a spring 3I1 to press a roller 3I8 on the opposite end thereof against the teeth of the ratchet and thus centralize the platen in its adjusted position.

In the event that the total or sub-total key 78 is depressed the floating lever 298 will be'rocked counter-clockwise as described herelnbefore to position a hook 3I9 thereon behind a pin 320 on an arm 32I fastened to a rock shaft 322. During the subsequent machine operation the lever 290 will be moved forwardly and the hook 3I9 will rock arm MI and shaft 322 in a clockwise direction. A second arm 323 also attached to shaft 322 is connected by a pin and slot connection 324 to the control lever 308 and, therefore, the latter will be rocked counter-clockwise, moving the pin 3I I forwardly whereby the spring 308 will become effective to position the pawl 303 forwardly in the location indicated by the dot and dash lines 303a. Consequently, during the subsequent stroke of the pawl 303 it will engage a ratchet tooth indicated at 3021) resulting in a three tooth advance of the platen. In the latter case, the shoulder 3 will also be effective to prevent overthrow of the platen at the end of the stroke.

The cut-off bar 30I is so located that after an additive or subtractive value has been printed, the paper strip will normally be advanced by the platen to a position wherein the printed numerals lie directly below the cut-off bar. However, after a total or sub-total operation the paper will be advanced to such an extent that the printed numerals of such total or sub-total values will lie directly above the cut-off bar, said bar being of a width substantially equal to one increment of spacing of the paper.

Manually selective means are provided to selectively control the control lever 309 so as to cause the pawl 303 to normally space the platen three increments or teeth as an incident to all types of machine operations including additions, etc., as well as totaling and sub-totaling. This provision affords suflicient spacing between the printed values to enable identifying marks, etc., to be written in between such values.

Referring to Fig. 9, a stud 500 on'the control lever 309 overlies a camming shoulder 50I on a lever 502 which is pivoted on a frame pin 503 and is provided with a handle portion 504 extending through an opening 505 (Fig. 1) in the rear of the upper machine casing 36I. By means of the handle portion, the camming lever 502 may be manually set clockwise from its illustrated position and, in this latter movement, the camming shoulder 50I will cam the control lever 308 into the same position it assumes under control of the link 290 during totaling and subtotaling operations. Thus, the platen will be advanced three increments regardless of the type of machine operation.

The lever 502 is limited in its movement by shoulders 505 which limit against a stationary frame stud 501. A toggle spring 508 is tensioned between an upper extremity of the lever 502 and a frame pin 509 located below the pivot pin 503 to maintain the lever in either of its adjusted positions.

Cover The machine is encased in a cover 38I of plastic or similar material supported in a suitable manner (not shown) by the machine frame plates 23 and 24.

In order to obtain maximum visibility of the values recorded on the paper strip and also to effectively cover the printing mechanism, a movable cover section 455 (Figs. 1, 2 and 3) is provided, being pivoted on trunnions 450 to the upper cover and extending over the printer mechanism to a point adjacent the platen I2. The section 405 is urged downward into the position 12 shown in Fig. 2 partly by its own weight an partly by a spring 451 extending between projections on the section and on the upper cover 36I. An arm 458 attached to the section 455 extends downward and has a cam surface on the lower edge thereof contacting a roller 459 carried by an arm 460 secured to the printer control shaft Normally, except during a printing operation, the section 455 lies in the position illustrated in Fig. 2, the rearmost edge of the section being positioned directly below the location of the printed numerals on the paper tape after such numerals have been recorded as the result of any operation but a total or sub-total operation, and after the tape has been advanced as an incident to such operation (assuming the lever 502 to be in its normal single spacing control position illustrated in Fig. 9). Therefore, it will be seen that the cover section aids in leading the operator's eyes directly to such last printed item. Also, the cover section and the tear-oft bar 30I frame said printed item so that the last recorded value may be quickly found by the operator. This is of considerable importance in checking the entry of items in the machine when such items are successively entered at a relatively high speed.

During a printing operation, the shaft I31, when rocked to allow the printer arms I35 to rock rearward, will cause arm 460 to force arm 458 and cover section 455 upward sufficiently to allow printer dials I35 and other elements carried by the arms I36 to pass thereunder as illustrated in Fig. 3. Since this movement of the cover section is accomplished at a high rate of speed it is practically invisible to the operator {and thus does not offer any material distrac- It will be noted that the cover section 455 also covers the ribbon I44 and thus prevents dirt and dust from falling thereon. Furthermore, the cover section hides the ribbon from view thus improving the appearance of the machine.

Although I have described my invention in detail and'have therefore used certain terms and languages herein, it is to be understood that the present disclosure is illustrative rather than restrictive, and changes and modifications may be made without departing from the spirit or scope of the invention as set forth in the claims appended hereto.

Having thus described the invention, what I desire to secure by United States Letters Patent is:

1. In a calculating machine, means for guiding a record medium past a recording station, recording mechanism comprising recording elements movable to and from said recording station to record a value on said record medium, a severing bar for said record medium located above said station, means operable as an incident to operation of said recording mechanism for advancing said record medium to position a recorded value thereon above said recording station and below said severing bar, a cover section for said recording mechanism, said cover section being normally located in a first position with one rend thereof adjacent the path of said recording medium and below said severing bar whereby to cooperate with said bar to frame one of said recorded values only at any one time, said cover section being also normally located 16 in the path of movement of said recording elements, means responsive to operation of said recording mechanism for raising said cover section above the path of movement of said recording elements and into a second position obstructing the last recorded value from view, and means for thereafter returning said cover section to said first position.

2. In a calculating machine, means for guiding a record medium past a recording station, recording mechanism comprising recording elements movable to and from said recording station to record a value on said record medium, a severing bar for said record medium located above said station, means operable as an incident to operation of said recording mechanism for advancing said record medium to position the last recorded value thereon above said recording station and below said severing bar, a cover section for said recording mechanism, said cover section being normally located in a first position with one end thereof adjacent the path of said record medium and sufficiently below said severing bar to cooperate with said bar to frame said last recorded value only, said cover section being also normally located in the path of move- -ment of said recording elements, means responsive to operation of said recording mechanism for raising said cover section above the path of movement of said recording elements and into a secondposition obstructing the last recorded value from view, and means for thereafter returning said cover section to said first position.

3. In a calculating machine, means for guiding a record medium past a recording station, recording mechanism comprising recording elements movable to and from said recording station to record a value on said record medium, a severing bar for said record medium located above said station, means operable as an incident to operation of said recording mechanism for advancing said record medium to position the last recorded value thereon above said recording station and below said severing bar, a cover section for said recording mechanism, said cover section being normally located in a first posi-- tion with the rear end thereof adjacent the path of said recording medium and sufficiently below said severing bar to cooperate with said bar to frame said last recorded value only, said cover section being also normally located in the path of movement of said recording elements, means pivotally supporting said cover section adjacent the forward end thereof for movement about a horizontal axis, means operable as an incident to operation of said recording mechanism for moving said cover section about said pivotal means and above the path of movement of said recording elements into a second position obstructing the last recorded value from view, and means for returning said cover section to said first mentioned position upon completion of operation of said recording mechanism.

4. In a calculating machine, means for guiding a record medium past a recording station, recording mechanism comprising recording elements movable to and from said recording station to record a value on said record medium, a severing bar for said record mediumlocated above said station, means for actuating said recording elements including an actuating member, a cover section for said recording mechanism, said cover section being normally located in a first position with the rear end thereof adjacent the path of said recording medium and sufliciently below said severing bar to cooperate with said bar to frame said last recorded value only, said cover section being also normally located in the path of movement of said recording elements, means pivotally supporting said cover section adjacent the forward end thereof for movement about a horizontal axis, means controlled by said actuating member upon movement of said recording ele ments to said station for moving said cover section about said pivotal means to a second position above the path of movement of said recording elements and wherein said cover section obstructs the last recorded value from view and for returning said cover section to said first position upon movement of said recording elements from said recording station.

5. In a caluculating machine, a platen for guiding paper past'a printing station, a cover-for said machine having an opening therein adjacent said platen, printing mechanism including printing elements movable in said opening to and from said printing station to print values on said paper, a severing bar for said paper located above said station, means operable as an incident to operation of said printing mechanism for advancing said paper to position the last printed value above said printing station and below said severing bar, a cover section, said cover section being normally located within said opening in a first position with one end thereof adjacent the path of said paper and below said severing bar whereby to cooperate with said bar to print the last value thereon only,

said cover section being also normally located in the path of movement of said printing elements, and means operable as an incident to operation of said printing mechanism for raising said cover section in said opening above the path of movement of said printing elements andto a second position obstructing the last printed value, said last mentioned means being operable thereafter to return said cover section to said first mentioned position.

6. In a calculating machine, a. platen for guiding a paper past a printing station, printing mechanism for printing values on said paper at said printing station, a severing bar for said paper located above said station, means operable as an incident to operation of said printing mechanism for advancing said paper to position the last printed value thereon above said printing station and below said severing bar, a cover section for said printing mechanism, said cover section being normally located in a first position with the rear end thereof adjacent the path of said paper and sufliciently below said severing bar to cooperate with said bar to frame the last printed value only at any one time, and means operable as an incident to operation of said printing mechanism for raising said cover section to a second position wh rein the latter obstructs the last printed value from view and for thereafter returning said cover section to said first mentioned position.

7. In a calculating machine, a platen for guiding a paper past a printing station, printing mechanism for printing values on said paper at said printing station, a severing bar for said paper located above said station, means operable as an incident to operation of said printing mechanism for advancing said paper to position the last printed value above said printing station and below said severing bar, a cover section for said printing mechanism, said cover section being normally located in a first position with the rear end thereof adjacent the path of said paper and sufiiciently below said severing bar to cooperate with said bar to frame the last printed value only REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,371,138 Bair Mar. 8, 1921 1,399,450 Trinks Dec. 6, 1921 1,568,338 Kurowski Jan. 5, 1926 1,705,272 Sunstrand Mar. 12, 1929 1,732,920 Waldheim Oct. 22, 1929 2,239,060 Sloan Apr. 22, 1941 2,245,142 Crosman June 10, 1941 2,258,695 Anderson Oct. 14, 1941 2,281,577 Haynes May 5, 1942

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