US3194496A - Pin carriage to clutch interlock mechanism in a ten-key adding and subtracting machine - Google Patents

Description

July 13, 1965 G. E. BULLOCK PIN CARRIAGE TO CLUTCH INTERLOCK MECHANISM IN A TEN-KEY ADDING AND SUBTRACTING MACHINE Filed Sept. 12, 1962 3 Sheets-Sheet 1 INVENTOR. 6,256.5 gflulfock 3,194,496 IN A July 13, i965 s. E. BULLOCK PIN CARRIAGE TO CLUTCH INTERLOCK MECHANISM TEN-KEY ADDING AND SUBTRAC'I'ING MACHINE Filed Sept. 12, 1962 3 Sheets-Sheei'. 2

g, JNVENTUR. $1 6 .31 [Zack Attorn ys July 13, 1965 G. E. BULLOCK PIN CARRIAGE TO CLUTCH INTERLOCK MECHANISM IN A TEN-KEY ADDING AND SUB'IRAGTING MACHINE Filed Sept. 12, 1962 3 Sheets-Sheet 3 3 mm m b Attom y United States Patent s 194 496 PIN CARRIAGE T0 cLUTcu INTERLOCK MECHA- NISM IN A TEN-KEY ADDING AND SUBTRACT- ING MACHINE Giles E. Bullock, 7960 Corbin Ave., Reseda, Calif. Filed Sept. 12, 1962, Ser. N 223,112 .5 Claims. (Cl. 235-130) This invention relates to mechanical computing machines of the type utilized for example in accounting work, in adding, subtracting, multiplying and dividing, and wherein a pin carriage having a series of digit position banks of memory pins (with, for example, nine pins in each bank and nine banks) is responsive to manual actuation transmitted from the keys of a ten-key keyboard in a key-punching operation. In such operation, the punched keys correspond to the digits of a number to be registered in the machine for addition to (or subtraction from) a series of previously registered numbers. The keys, as they are punched, are operative progressively on the successive banks of memory pins, the pin carriage being advanced in a stepping action to successive digit positions so as to bring .a new bank of memory pins into operative relation to the manual actuator keys following each actuation of a key on the keyboard. In such a machine, when a selected number is thus registered on the pin carriage (functioning as a memory device) an add or subtract key is pressed to initiate a power cycle wherein the dial wheels of a conventional dial wheel assembly are rotated and stopped by projecting pins in the pin carriage, in positions registering the number that was impressed on the pin carriage, While the invention is applicable to a manually powered machine wherein this power cycle is carried out by manually oscillating an actuator lever, the invention has its primary usefulness as applied to an electric motor driven calculator wherein the depression of the add or subtract key initiates a cycle of operation of a motor which drives the dial wheels, and at the same time effects a printing operation wherein the platen which supports the record tape is moved forwardly to press the tape against type elements carried on the peripheries of the dial wheels.

The machine to which the invention is applied, further embodies a correction (clearing) key which can be actuated to clear an erroneous number from the pin carriage.

This is done by restoring the pin carriage to its home position, and the correction key is directly linked to an automatic clearing mechanism which is power-operated at the end of each power cycle. In such a machine, it is possible to jam the mechanism if any of the power cycle key-stadd, subtract, non-add, sub-total and total keys) is actuated simultaneously with actuation of the correction key, since the pin carriage must be in a stationary position during each power cycle, and if it is moving in response to actuation of the correction key when a power cycle is initiated, the power-driven parts will inevitably jam against the displaced pin carriage parts.

The principal object of this invention is to provide an interlock between the pin carriage clearing linkage and the power cycle keys such that the actuation of any power cycle key will block the movement of the clearing linkage and, vice 'versa, the actuation of the correction key will result in blocking the actuation of the power cycle keys.

The invention is especially directed to the improvement of an exceedingly compact, light-weight machine which has appeared on the market in recent years but has met with only slight success because of lack of protection against the jamming referred to above. Furthermore, this machine is so compact'that it involves a very distinct problem of space for accommodating an interlock mechanism. Accordingly, a further and specific object of the invention is to provide an interlock mechanism which 3,194,496 Patented July 13, 1965 occupies a shallow space at the very forward extremity of the machine, between the case and the frame. The interlock is linked to the clearing linkage at one side of the machine and to the power control linkage at the opposite side of the machine in a simple, compact and easily serviced arrangement.

Other objects and advantages will become apparent in the ensuing specification and appended drawings in which:

FIG. 1 is a plan view of an interlock mechanism embodying the invention, including both portions of the machine on which the interlock mechanism is operative but omitting the majority of the conventional operating mechanism of the machine;

FIG. 2 is a right side elevational View of the same;

FIG. 3 is a front elevational view of the same;

FIG. 4 is a left side elevational view of the same.

General description Referring now to the drawings in detail, the invention is illustrated therein as embodied in a calculating machine wherein power cycles are initiated by a series of power keys in a group indicated at A, operating on clutch actuating linkage B to release a clutch-cam unit C for rotation transmitted to it from power mechanism D which is energized simultaneously by the clutch actuating linkage B.

Clutch-cam unit C, which is thus rotated one revolution, is operatively connected to a series of actuator rack units E in a manner to release them for spring-biased upward movement. The upward movement of some of the rack units B will be arrested by projected memory pins of a pin carriage F, in accordance with a number registered on the pin carriage by previous keyboard actuation. None of the keyboard mechanism is illustrated except the group of ten numeral keys indicated at K, but it will be understood that it is operative to set the pins of successive banks in the carriage F in response to depression of successive numeral keys, and that the actuated pins will be projected into the path of upward movement of respective rack units E. Thus, in the operation of a power cycle, one or more of the rack units E will be arrested in positions registering the number that was previously impressed on the pin carriage F.

The upward movement of the respective rack units E is transmitted by rack and pinion action to respective dial wheels of a dial unit G.

The dial wheels are fixed to respective pinions which are constantly in mesh with the racks of their respective rack units E, so that the actuated dial wheels will be set to the correct positions corresponding to the keys that have been punched, as determined by the positions of elevation of the respective rack units, without possibility of ernor. It may be noted at this point that each of the rack units carries on it an accumulator actuator unit having two-Way-operating racks selectively brought into operating position depending on whether the add or the subtract button is depressed, whereby the numbers registered on the dial assembly are transferred by the accumulator mechanism into a sub-total or total. However, the present invention affects the accumulator mechanism only indirectly through the respective rack units, and accordingly, no part of the accumulator mechanism is disclosed herein.

It should also be pointed out that much of the conventional mechanism of the'machine to which the invention is applied, if disclosed at all herein, is shown schematically and not in full mechanical detail, so as to avoid unnecessary obscuring of the improvements constituting the invention, the primary purpose of the disclosure being to identify the type of machine to which the invention is applied.

Each of the dial wheels of dial assembly G has a series of peripheral type units, including the ten digits of the decimal system plus other symbols which may be desirable for indicating various conditions of operation. The machine further includes a platen unit H having suitable support arms or carriage mechanism for advancing the platen roll (and the tape I supported thereby), into impression contact with the type which are positioned by the indexing of the dial wheels, for imprinting the number that has been registered on the machine by keyboard actuation.

With the conventional calculator mechanism brieiiy outlined above, the invention combines an interlock mechanism which is indicated generally at J and which extends across the front end of the machine as best illustrated in FIG. 1.

In the keyboard actuating mechanism, indicated at K in FIG. 1, a zero bar and nine numeral keys are designated by their respective numerals 9, ll, 2, 3, 4, 5, d, 7, 8 and 9 respectively; add, subtract, non-add, sub-total and total keys of group A being indicated by the plus and minus signs and by the letters N, S and T respectively. A multiplication button (which has the conventional function of preventing the clearing of the machine so that successive adding operations can be performed without losing the preset number from the memory mechanism) is indicated by the letter X. These are indicating characters actually imprinted on these respective keys. The respective numeral keys K are connected to suitable linkage (not shown) which is disposed in the area seen to the left of the pin carriage F in FIG. 2, so that upon manual actuation of a key, a respective memory pin of carriage P will be shifted into projecting relation to the path of movement of a respective rack unit E (thus remembering the numerals punched on the keyboard).

It may now be noted in FIG. 1 that the numeral keys tl9 are arranged in a compact group opposite the center of the area in which the pin carriage F is arranged to slide, so that the respective actuating linkages may be directly associated with the pins of carriage F. Also, it should be pointed out that the keys of group A including the add, subtract, multiply, non-add, sub-total and total keys, referred above, constitute the keys of the power cycle group, the operation of which is to be protected by the interlock mechanism of this invention.

The conventional mechanism further includes a correction key Q which is in the form of a lever. A clearing linkage R is alternatively operable manually by the correction key Q and by power operation during each power cycle. Its function, in general, is to restore the pin carriage F to a starting or home position after having been successively shifted to succeeding digital positions by escapement mechanism operated by the respective numeral keys of group K, whereby the pin carriage is advanced one digital position each time a numeral key is touched.

Detailed description Amplifying the foregoing generalized outline description, I will now describe the illustrated portions of the machine more in detail.

In group A of power actuator keys, each key embodies a button 19, a key bar 11, a cam pin 12 carried by bar 11, and suitable supporting guides (not shown) Connected to the lower ends of the respective key bars 11 are respective elements of linkage (not Shown) including bell crank levers and push bars extending rearwardly from keys S and T, and rocker levers extending rearwardly from other keys of the A group for effecting various control actions on the clutch-cam unit C and other parts of the power mechanism; whereby the actuation of the various keys of group A will initiate various power cycles such as adding, subtracting, sub-totaling and totaling, etc., there being some type of-power actuation in each instance. The interlock mechanism J of the invention blocks the transmission of movement through these various linkages whenever the clearing mechanism R is away from its home position as a result of movement of correction lever Q. It will be understood that the clearing mechanism R will not be power operated at the wrong time, since the machine is designed to effect the clearing operation at the end of a power cycle and not during the power cycle.

Clutch actuation linkage B constitutes a specific part of the linkage just referred to. It comprises a clutch actuating slide bar .15 having a series of cam notches 16 in inclined positions in its upper side and coperating with the cam pins 12; of the respective keys of group A for releasing the clutch as a preliminary step in each power cycle. The slide 15 is connected by a trip link 17 to a holding latch 18 having a jaw 19 normally en aged with a tooth 29 on the periphery of a cooperating holding disc 21. Latch 18 is in the form of a lever pivoted at 22 to the frame, and having a tail portion 23 engaged beneath the end of a switch actuator rocker arm 24.

Power mechanism D includes the arm 24 which is pivoted at 25 to the frame and has an actuator finger 26 for depressing a spring finger 27 of a microswitch 2.3 which closes the circuit to an electric motor 29. Motor 29 has a driven pinion 30 which drives an idler gear 31 carrying a pinion 32 which in turn drives a gear 33 on the shaft of clutch-cam assembly C.

Clutch-cam assembly C includes the latching parts 20- 22 previously described; a cam shaft 3 on which the gear 33 is mounted; a clutch mechanism (not shown) for clutching the gear 33 to the shaft 34 when one of the keys of the power cycle group A is depressed; and a series of cams, secured to the shaft 34-, one of said cams being disclosed at 35. The cam 35 operates against the follower end of a rocker arm 36, fulcrumed on a pivot 37 and, at its opposite end, supports one end of a hold down bar 38 extending across the accumulator section of the machine. The cam 35 and rocker arm 36 are duplicated at both sides of the accumulator section, whereby the bar 38 will be bodily raised and lowered by swinging movements of the two rocker arms 36. In its lowered position shown in FIG. 2, the bar 38 holds down all of the rack units E in their home positions. As the cam shaft 34 is released for one revolution, the earns 35 will rotate away from the follower ends of rocker arms 36, releasing them so that the rack units E are free to move upwardly in response to spring loading, until stopped by projecting pins 57 of pin carriage F. It will be understood that the clutch-cam assembly C includes other elements not necessary to this description and accordingly not shown herein.

Rack assembly E comprises a plurality of rack units each embodying a vertically slidable arm 41 having longitudinal slots 42 through which are extended guide bars 43; having at their upper ends rack teeth 44 for receiving resetting movements; and having at their lower ends, stop ringers d5 projecting beneath the hold down bar 38, and into positions for engagement with projected memory pins of unit F. Spring power for elevating the units E is provided by respective coil springs 46, each connected under tension to a respective stop finger 45 at its lower end and to a frame anchor 47 at its upper end.

It may now be noted that the hold down bar 38 extends above the stop fingers 45 so as to hold all of the rack units E in their lowered home positions until released for upward movement in the beginning of a power cycle.

Pin carriage F comprises a carriage frame Stl mounted for transverse sliding movement on vertically-spaced slide bars 51, 52, the ends of which are mounted in the machine frame 58 as shown in FIG. 1. The carriage F is advanced by a coil spring 54 which is connected under tension between the frame 53 and a tab 55 on carriage frame 50. The carriage F is held back by escapement mechanism (not shown) such escapement mechanism being successively actuated by the numeral keys of group K so as to advance the carraige one digital position for each actuation of a key. Such escapement mechanism is well known not only in the adding machine art but also in the typewriter art and accordingly is not herein illustrated.

clearing mechanism R hereinafter described.

In the carriage frame 50 are mounted a series of vertical banks of memory pins 57, each having nine pins in vertically spaced relation and there being nine banks in horizontally spaced relation. As the carriage is advanced to successive digital positions, successive banks of pins are brought into registration with the actuator linkage of the numeral key group K., Such actuator linkage is effective to displace a pin (corresponding to a punched key) rearwardly (rightwardly asseen in FIG. 2) to a position over-hanging the tip of a respective stop finger 45 of a rack unit E. As a key is punched and a pin is projected, the escapement mechanism will be actuated to release the carriage F for advancement to the next digital position and the next punched key will similarly project driven by the rack teeth 41 of a respective rack unit E.

Thus the dial wheel 60 is positioned in a numeraLindicating position determined by the position at which the rack unit E has been arrested in its upward movement. Each dial vwheel 60 includes appropriate type for imprinting on the tape I a numeral correspondingto the position to which it has been set.

Ploten unit H comprises a conventional platen roll 65 carried by respective arms 66 which in turn are controlled by a cam (not shown) on cam shaft 34 in a manner analogous to the rocker arms 36 of the hold down mechanisrn. Each revolution of the cam shaft accordingly advances the platen roll 65 to bring the tape Iinto engagement with the type of dial wheels 60 in accordance with the positioning thereof by the units E.

Correction key Q, which includes parts directly involved in the present invention, comprises a lever 70 disposed in a vertical plane immediately adjacent the leftward rail of frame 58 on the outer side thereof and pivoted thereto by a fulcrum pivot 71; a lever arm 72 projecting downwardly from pivot 71 and connected to the clearing linkage R; and an integral blocking finger 73 projecting forwardly from the fulcrum pivot 71. On its forward end, finger 73 hasan arcuate blocking face 74, concentric with pivot 71. Finger 7'3 constitutes a portion of the interlock mechanism J. The lever 70 has a retracted home position, shown in full lines in FIG. 4 wherein the finger 73 projects above the plane of a cooperating part of blocking mechanism I, so thatit can prevent the movement of the lever 70 forwardly into an operating range so long as the mechanism J is in blocking position beneath the finger 73.

Correctionkey Q, reset mechanism R, and their associated parts are shown in direct view in FIG. 4, looking at the left side of the machine where these parts are located. However, they are also seen in phantom in FIG.

-2, illustrating their positional relationship (lengthwise of the machine), to the other components.

Clearing mechanism R comprises a slide 75 having in its respective end portions, longitudinal slots 76 by which it is slidably mounted on studs 77 projecting from the frame. Slide 75 is mounted in direct sliding engagement with the outer face of frame 58 as best shown in FIG. 1,

and has a yoke 78 formed as an integral extension from the upper margin thereof and projecting inwardly through a slot 79 in the frame 58. Yoke 78 has a transverse slot 80 therein. l

A bell crank lever 81, disposed in a horizontalplane near the bottom of the machine, is fulcrumed to the frame on a vertical pivot 82. Lever 81has a relatively short lever arm 83 extending beneath yoke 78 and provided with an upwardly projecting roller 84 which is engaged in slot 7 80; and has a relatively long arm 85 projecting diagonally inwardly and rearwardly toward the center of the machine and connected by a drag link 86 to the pin carriage F, one end of the link 86 being pivoted to the end of lever arm 85 audits other end being pivotally connected to an ear 87 projecting forwardly from the pin carriage frame 50. The linkage 78-87 is arranged to transmit shifting movements in both directions between the pin carriage F and the slide 75 of clearing linkage R, in stages of successive digital positions of the pin carriage.

An abutment pin 88 is secured in slide 75 and projects outwardly across the path of horizontal swinging movement ofthe lower end of the correction lever arm 72. In the home positions of the lever 70 and slide 75, the abutment pin 88 is spaced rearwardly rfom the lever arm 72 as best indicated in FIG. 4. The spacing is such that the slide '75 may shift from its home position to a fully shifted position corresponding to the limit position of stepping movement of pin carriage F, before contact is established with abutment pin 88. During the stepping movements of pm carriage F, slide 75 will be correspondingly intermittently advanced from its position shown in full lines in FIG; 4 toward the right as seen in that figure, until, in a limit position of such intermittent advancing movements, abutment. pin 88 will rest in contact with or immediately adjacent the lower end of correction lever arm 72. From this position or any intermediate position, the slide 75 can be shifted back to its home position by moving the correction lever 7t) forwardly, causing its arm 72 to swing rearwardly intocontact with abutment 92 acts against one arm of a bell crank lever 95 pivoted pin88 and pushing the slide back to its home position in a continuous movement. Thus it is possible to restore the pin carriage F to its home position prior to effecting a power cycle of operation and to thus avoid having the information stored on the pin carriage F transferred'to the dial wheel and printing assembly G and H;

Secured to a suitable transverse frame element in the center of the machine, just rearwardly of the pin carriage slide frame 50, is a pin-reset plate 90 having a ramp portion 91 at its forward end (the end which is first engaged by theprojected memory pins of carriage F during a clearing operation). The movement of the projected pins against the ramp 91 andalong the body of reset plate 99 effectively returns the pins to their home positions shown at the left-ward side of carriage 50 in FIG. 2.

In the normal operation of the machine, during a power cycle, movement is transmitted to the slide 75 to draw it rearwardly, thus resetting it to its home position. Such movement is generated by a cam 92 on the cam shaft 34. The linkage for transmitting this resetting movement includes pull-link 93 which is pivotally linked to a stud 94 projecting outwardly from the rear end of slide 75. Cam

toframe 53 at 96, the other arm of lever 95 having at its end a projecting pin 97 engageable with a shoulder 98 on pull-link 93 at a time when the link 93 is elevated by operation of a control crank 198 (responsive to another cam on shaft 34) the projecting end of link 93 being slidably coupled to a laterally projecting guide tab 99 on the end of a vertically-movable arm of crank 198. During each power cycle, the clearing mechanism R will be automatically actuated to return the slide 75 to its home position restoring the pin carriage F to its home position, with the pins 57 being automatically reset by brushing engagement with reset plate 90. Since the present invention is concerned only with protecting against the untimely operation of correction key Q or a key of power group A and since the automatic clearing operation just described is connecting the cam shaft 34 to the slide 75, which is somewhat complex, are only partially disclosed herein.

Interlock mechanism J comprises a rocker lever tilt disposed in a plane parallel to and somewhat below the inclined plane of the keyboard and mounted directly to the underside of a lower keyboard plate tilt (FIG. 3) by a pivot Hi2 disposed approximately midway between its ends. Lower keyboard plate fill may be a sheet metal stamping, with end tabs 103 bent downwardly and secured to the respective side members of frame 53.

Viewing the lever 16% from the forward end of the machine (FIG. 3) it has at its leftward end a downwardly offset finger 1% which projects through a slot 165 in the leftward member of frame 53. Finger 1% is disposed in non-blocking relation to the blocking finger 73 of correction lever '74 (clearing the tip of the same) when the lever 160 is in its home position shown in full lines in FIG. 1.

At its other end, lever 1% has a tip 1th: which projects through a slot 187 in the forward end of clutch actuating slide 315 (in an integral finger 1&8 projecting downwardly from the forward end thereof). Lever tip res is embraced fairly closely between the forward and rearward extremities of slot 107, with just sufficient clearance to permit freedom of tilting movement of the tip 1% in the slot. Thus there is provided a two-way driving connection between the lever tip 166 and slide 15 whereby movement may be transmitted from either of these parts to the other.

At this point it should be noted that the clutch actuating slide 15 functions as a common transmitting link for each of the five power keys of group A (the minus key and the keys N, S and T having direct connections between respective actuator pins 12 and slots 16, and the add key having a more indirect connection through a bell crank, not shown, and a connecting link 110 to the finger 108). Accordingly, the single interlock lever 160 provides a blocking connection between each of these power keys and the correction key Q.

Operation The detailed phases of operation of the various components of the machine have been largely described in the foregoing description of these units, and at this point I will only review the overall operation of the machine, particularly with reference to the interlock mechanism.

In the novel operation of this machine, the numeral keys of group K will be selectively operated to register numbers on the pin carriage F by pushing back a pin in each of a number of successive banks of pins, in accordance with the numeral keys that are depressed and the order in which they are depressed, the carriage F shifting sequentially toward the center of the machine in response to operation of the escapement mechanism, until the selected number is registered. During the key-punching stage of operation, each advancing movement of pin carriage F away from its home position will be transmitted through linkage 37-73 to the slide 75, shifting it successively toward the forward end of the machine. If a nine digit number is punched on the keyboard, the abutment pin 38 of slide '75 will move to its forward limit position immediately adjacent the lower end of correction lever arm '72 (as the result of the nine successive movements resulting from the punching of nine keys). When the key-punching operation is completed, one of the power keys of group A (e.g., the add key) will be depressed, starting the motor 29, releasing the holding mechanism of assembly C, engaging the clutch of assembly C and effecting one revolution of cam shaft 34. In this revolution, the cam mechanism will raise the hold down bar 38 from its restraining home position, thus permitting the respective rack units E to be raised by the respective biasing springs 46, to positions established by engagement of their respective stop fingers 45 with the projected memory pins of carriage F. The upward movements of rack units E will index the dial wheels of assembly G to positions corresponding to the number punched on the keyboard, and in the terminal phase of the cycle the platen H will be advanced, imprinting this number on the tape A by contact with the type on the peripheries of dial wheels 60. Finally, the clearing mechanism R will be actuated by connecting link 92 to draw the slide 75 rearwardly, thus transmitting movement through linkage 78-87 to return the pin carriage F to its home position, the projected pins 5?? brushing against the reset plate Qt) to erase the number that has been registered on the carriage F. At the end of the power cycle, movement transmitted from the cam shaft 34 through link 92 will restore the slide 75 to its home position as previously described, and this movement will be transmitted through linkage '7387 to the slide F, restoring it likewise to its home position. If during the punching of the numeral keys, the operator discovers he has made an error, he can manually restore the carriage F to its home position by pulling the correction lever '76 forwardly, bringing the lever arm 72 rearwardly into engagement with abutment pin 88 and correspondingly shifting the slide 75 rearwardly, the lever 70, in its forward limit position shown in dotted lines in FIG. 4, completing the return of the slide 75 to its home position.

If, during such a correction operation, the operator should accidentally strike one of the keys of the power group A, a power cycle would be initiated during the clearing movement of memory pin carriage F, and the resulting uncontrolled interference between the power operated parts and the rearwardly projecting pins would result in damage to these conflicting parts. The damage can proceed to the extent of breaking off the projecting pins 57, bending the rack units E into permanently distorted positions, and rendering the accumulator mechanism inoperative.

The invention protects the machine against such an occurrence as follows: as long as all of the power buttons of group A are in their elevated home positions, the clutch actuating slide 15 will remain in its home position shown in FIG. 2, and the interlock lever tilt) will accordingly be disposed in its home position with its rightward tip 106 in its rearward limit position, and with its blocking finger 104 in its forward limit position, all as shown in full lines in FIG. 1. In that position, the blocking finger 104 will be in non-blocking relation to the finger 73 of correction lever 76. Consequently, it is possible to pull the lever 70 rearwardly to effect the correction operation, the finger '73 swinging downwar ly and clearing the blocking tip 194 of the interlock lever.

On the other hand, if one of the power keys of group A is depressed, the clutch actuating slide 15 will be shifted forwardly, and the linking connection between its forward finger 1% and the interlock lever tip 196 will swing the lever ltitl in the clockwise direction as viewed in FIG. 1,

0 to the blocking position shown in broken lines in that figure. This will bring the blocking tip 194 to a blocking position beneath the finger 73 of correction lever 76) prc venting the rearward swinging movement of that lever toward its resetting position shown in broken lines.

Conversely, if the lever 79 has previously been actuated toward its clearing position, swinging the blocking finger 73 downwardly, the arcuate end face 74 of the finger will be moved into blockinr relation to the rear edge of blocking finger i194 so as to effectively prevent rearward movement of the finger iii-t. Thus the lever 1% is blocked from rocking movement from its home position to its shifted position shown in broken lines in FIG. 1, and the linking connection between its rightward tip 106 and clutch slide 15 will prevent any movement of the slide 15 in the direction to release and actuate the clutch-cam assembly C.

I claim:

1. In a calculating machine, of elongated form, front to rear, in combination: memory means to register a keyboard-punched numeral for transfer to an accumulator; clearing means to restore said memory means to a home position for registering another numeral; a correction lever operable on said clearing means for correctional clearing, said correction lever being mounted at one side of the machine on a pivot and projecting upwardly therefrom for forward swinging movement to effect said correction clearing, said lever having a forwardly projecting blocking finger; power control means disposed at the other side of the machine near its forward end, for initiating cycles of transfer from said memory means to an accumulator; and an interlock lever extending transversely across said forward end of the machine and pivoted thereto intermediate its ends for rocking movement in a substantially horizontal plane, said interlock lever having one end linked to said power control means for fore-aft swinging movement, and its other end movable rearwardly in response to actuation of said power control means, to a position extending beneath said blocking finger to prevent forward movement of said correction key, said blocking finger having a vertically extending arcuate forward face which moves downwardly when said correction key is actuated, to a position blocking rearward movement of said other end of the interlock lever so as to prevent actuation of said power control means; whereby said interlock lever is effective to permit independent actuation of either said correction lever or said power control means while preventing simultaneous actuation of both.

2. In a calculating machine, in combination: a frame; memory means comprising a carriage having a plurality of banks of memory pins movable to displaced numeral-registering positions in response to manual actuation of numeral keys on a keyboard; means mounting said carriage in said frame for stepping movements from a home position to successive digital positions; clearing means for restoring said carriage to its home position; a correction lever operable on said clearing means for correctional clearing, said correction lever being mounted at one side of the machine on a pivot and projecting upwardly therefrom for forward swinging movement to effect said correction clearing, said lever having a forwardly projecting blocking finger; power control means disposed at the other side of the machine near its forward end, for initiating cycles of transfer from said memory means to an accumulator; and an interlock lever extending transversely across said forward end of the machine and pivoted thereto intermediate its ends for rocking movement in a substantially horizontal plane, said interlock lever having one end linked to said power control means for fore-aft swinging movement, and its other end movable rearwardly in response to actuation of said power control means, to a position extending beneath said blocking finger to prevent forward movement of said correction key, said blocking finger having a vertically extending arcuate forward face which moves downwardly when said correction key is actuated, to a position blocking rearward movement of said other end of the interlock lever so as to prevent actuation of said power control meansywhereby said interlock lever is effective to permit independent actuation of either said correction lever or said power control means while preventing simultaneous actuation of both.

3. A calculating machine as defined in claim 2, wherein said frame includes a vertical fore-aft member having a fore-aft slot in which said other end of the interlock lever is slidable and supported to resist downward deflection by said correction lever finger.

4. A calculating machine as defined in claim 3, said frame including a keyboard plate to the underside of which said interlock lever is pivoted, said other end of the interlock lever being offset downwardly from the body thereof.

5. A calculating machine as defined in claim 2, wherein said power control means includes a longitudinally movable link extending along said other side of the machine and having in its forward end a slot through which said interlock lever is extended to provide a linking connection to said link.

References Cited by the Examiner UNITED STATES PATENTS 1,249,554 12/17 Thieme 235-6031 1,455,280 5/23 Vickers 235-6017 2,203,533 6/40 Landsiedel 235- 2,733,858 2/56 Anderson 235 2,905,382 9/59 Carnacina 235-60 2,942,776 6/60 Anderson 23560 2,989,231 6/61 Mark et a1 235-445 LEO SMILOW, Primary Examiner.

Claims (1)

1. IN A CALCULATING MACHINE, OF ELONGATED FORM, FRONT TO REAR, IN COMBINATION: MEMORY MEANS TO REGISTER A KEYBOARD-PUNCHNED NUMERAL FOR TRANFER TO AN ACCUMULATOR; CLEARNING MEANS TO RESTORE SAID MEMORY MEANS TO A HOME POSITION FOR REGISTERING ANOTHER NUMERAL; A CORRECTION LEVER OPERABLE ON SAID CLEARING MEANS FOR CORRECTIONAL CLEARING, SAID CORRECTION LEVER BEING MOUNTED AT ONE SIDE OF THE MACHINE ON A PIVOT PROJECTING AND PROPEJECTING UPWARDLY THERE FROM FOR FORWARD SWINGING MOVEMENT TO EFFECT SAID CORRECTION CLEARING, SAID LEVER HAVING A FORWARDLY PROJECTING BLOCKING FINGER; POWER CONTTROL MEANS DISPOSED AT THE OTHER SIDE OF THE MACHINE NEAR ITS FORWARD END, FOR INITIATING CYCLES OF TRANSFER FROM SAID MEMORY MEANS TO AN ACCUMULATOR; AND AN INTERLOCK LEVER EXTENDING TRANSVERSELY ACROSS SAID FORWARD END OF THE MACHINE ANDPIVOTED THERETO INTERMEDIATE ITS ENDS FOR ROCKING MOVEMENT IN A SUBSTANTIALLY HORIZONTAL PLANE, SAID INTERLOCK LEVER HAVING ONE END LINED TO SAID POWER CONTROL MEANS FOR FORE-AFT SWINGING MOVEMENT, AND ITS OTHER END MOVABLE REARWARDLY IN RESPONSE TO ACTUATION OF SAID POWER CONTROL MEANS, TO A POSITION EXTENDING BENEATH SAID BLOCKING FINGER TO PREVENT FORWARD MOVEMENT OF SAID CORRECTION KEY, SAID BLOCKING FINGER HAVING A VERTICALLY EXTENDING ARCUATE FORWARD FACE WHICH MOVES DOWNWARDLY WHEN SAID CORRECTION KEY IS ACTUATED, TO A POSITION BLOCKING REARWARD MOVEMENT OF SAID OTHER END OF THE INTERLOCK LEVER SO AS TO PREVENT ACTUATION OF SAID POWER TO CONTROL MEANS; WHEREBY SAI INTERLOCK LEVER IS EFFECTIVE TO PERMIT INDEPENDENT ACTUATION OF EITHER SAID CORRECTION LEVER OR SAID POWER CONTROL MEANS WHILE PREVENTING SIMULTANEOUS ACTUATION OF BOTH.

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