US2954924A - Calculating machines - Google Patents

Description

O t, 4, 1960 K. LEICH ETAL CALCULATING MACHINES '7 Sheets-Sheet 1 Filed April 19, 1956 55, Z y ZM e @zfm r I-LH 1L 2 Z w Oct. 4, 1960 2,954,924

CALCULATING MACHINES Filed April 19, 1956 7 Sheets-Sheet 2 Oct. 4, 1960 LE'CH ETAL 2,954,924

CALCULATING MACHINES Filed April 19, 1956 7 Sheets-Sheet 4 Oct. 4, 1960 K. LEIGH EIAL 2,954,924

CALCULATING MACHINES Filed April 19, 1956 7 Sheets-Sheet 6 [rive/760m KARL L 5/ c h y EaEeHmo ML-Wqs Oct. 4, 1960 LE'CH 2,954,924

CALCULATING MACHINES Filed April 19, 1956 7 Sheets-Sheet '7 Fig. 72

INVENTORS (A?! LF/ff/ EBEE/ MPD 4454 65 CALCULATING MA'CHINES Karl Leich, Lebenstedt over Braunschweig, and Eberhard Menge, Braunschweig, Germany, assignors t Brunsviga Maschinenwerke A.G., Braunschweig, Germany Filed Apr. '19, 1956, Ser. No. 579,293

Claims priority, application Germany Apr. 23, 1955 Claims. (Cl. 235-63) The present invention relates to calculating machines, and more particularly to a ten digit key calculating machine having a rotary differential actuator supported in an ordinally shiftable carriage, a stationary accumulator, and a stationary counter for registering the number of revolutions of the actuator.

Calculating machines of the kind described hereinabove are disclosed in German Patent 907,836, corresponding to U.S. patent application Serial No. 323,411, filed December l, 1952, in the name of Eberhard Menge, issued as U.S. Patent No. 2,879,938 on March 31, 1959.

It is an object of the present invention to improve the mechanism described in German Patent No. 907,836, corresponding to the above-mentioned U.S. patent.

It is another object of the present invention to provide a retransmitting mechanism including devices for shifting the actuator carriage from its initial rightmost position to a predetermined ordinal position.

It is a further object of the present invention to provide a mechanism allowing a retransmitted item to be transferred into the revolutions counter directly after the retransmission thereof.

It is still another object of the present invention to provide a mechanism allowing a retransmitted item to be transferred into the accumulator.

Further objects and advantages will become apparent from the following description of the invention taken in conjunction with the figures, in which:

Fig. 1 is a plan view of part of the mechanism of a calculating machine according to the present invention;

Fig. 2 is a side elevation, partly in section, on an enlarged scale of one of the keys shown in Fig. 1 and the control slides associated therewith;

Fig. 3 is a side elevation, partly in section, along the line III-III of Fig. 1;

Fig. 4 is a plan view of the mechanism shown in Fig. 3;

Fig. 5 is a detail of Fig. 3 seen at right angles thereto, on an enlarged scale;

Fig. 6 is a side elevation, partly in section, of the left part of Fig. 3, showing some details seen along the line VIVI of Fig. 8;

Fig. 7 is a partial side elevation of an enlarged scale United States Patent 0 of the device shown in Fig. 6, seen at right angles thereto from the rear;

Fig. 8 is a plan view of the device shown in Figs. 6 and 7;

Fig. 9 is an elevation of a detail of Figs. 3 and 4 seen in the direction of the arrow IX in Fig. 3;

Fig. 10 is a schematical top plan View of the main parts of the mechanism shown in Fig. 1 similar to Fig. 1 of U.S. Patent No. 2,879,938;

Fig. 11 is a perspective view of certain details shown in Figs. 6 and 8 and of additional parts;

Fig. 11a is a perspective view of a part adapted for cooperation with Fig. 11; and

Fig. 12 is an elevation of apart of Fig. 11.

Referring now to the drawings in detail, and first to Figs. 1 and 10, carriage 4 (Fig. 1) is shiftably mounted on a shaft 2 of a calculating machine having a frame 3, the shaft 2 being arranged in the frame 3 for rotation by a handle or crank. The carriage 4 carries a rotary differential actuator 4, comprising a plurality of denominationally spaced pin wheels '9 which may be adjusted, respectivey, by cam disks 9 known in the art to project a plurality of pins 10, displaceable in pin wheels 9, in a radial direction. A spring 5 urges carriage 4 and actuator 4 to the left as seen in Fig. 1, whereas a wire 7 (Fig. 1), loaded by a tension spring 8, is provided with a stop 6 for engaging and moving the carriage 4 to the right into its initial rightmost position, against the action of the spring 5, during a normalizing operation.

In order to introduce values in the actuator 4 digit keys 11 are sequentially depressed as more fully described in German Patent No. 907,836 and the corresponding U.S. Patent No. 2,879,938 issued to Eberhard Menge on March 31, 1959, reference to which is made. Depression of one of the digit keys 11 causes the associated toothed cam disk 9 to rotate through an angle corresponding to the digit value represented by the depressed key. Such rotation of the cam disk 9' causes a cam groove therein to radially project a number of pins 10 (Fig. 10) from the corresponding pin wheel 9. The cam disks 9 are. rotated by a toothed segment (not shown) operated by the digits keys 11 which engages the teeth of the cam disk 9 located directly to the right of the unit denomination 18 of an accumulator 18 having a set of digit wheels 18a revolvable about the axle 78 so as to assume any digit position including a zero position.

After completing the value-introducing movement for the highest left denominational order of a number, the actuator carriage 4' is shifted denominationally to the left so that the value indexing operation described hereinabove may be repeated for the next lower denominational order of the number.

After a desired number has been introduced into the actuator 4, it is transmitted to the accumulator 18 by intermediate wheels 19 forming part thereof, the wheels 19 being actuated by the pins 10 projecting radially from the pin wheels 9 when actuator 4 rotates.

Simultaneously the number of complete revolutions of the shaft 2 is registered in a revolutions counter 20 (Fig. in a known manner. The revolutions counter is provided with a set of digit wheels 20' and a set of intermediary wheels 24 adapted to be engaged by the pins 10 radially advanced by introducing a number into the actuator 4, if the latter is rotated after being shifted again to the right to a desired position opposite the revolutions counter 20.

The actuator 4 may be moved from any position opposite the accumulator 18 or the revolutions counter 23 by a partial step to the right to a position in which the intermediary wheels 19 or 24 engage the toothed portions 9" of the cam disks 9 to enable retransmission of either the accumulator 18 setting or the revolutions counter 20 setting into the actuator 4 by a rotation of the shafts 78 or 83 which zeroize the accumulator 18 and the revolutions counter 20, respectively.

The actuator 4 has to be brought into engagement witha Zeroizing device 22 (Figs. 1 and 6) which is supported with the actuator 4 by the shiftable carriage 4 The Zeroizing device 22 comprises a set of partly toothed wheels 22, having an interdental space, shiftably mounted on a shaft 21. The number of wheels 22 equals the number of cam disks 9. Upon rotation of the shaft 21 by a sprocket wheel 87, driven by a chain 86;, more fully disclosed in the Germany Patent No. 907,836 corresponding to the U.S. Patent No. 2,879,938 mentioned hereinabove, the teeth of the Wheels 22 engage, respectively, the

toothed portions 9" of the cam disks 9, as more fully described with reference to Fig. 3 of the German Patent No. 907,836 and the corresponding U.S. Patent No. 2,879,938 mentioned hereinabove. Control rings 9" alternate with the cam disks 9; their function will be explained in connection with the subject matter of Figs. 6, 7 and 8 under the heading Zero adjustment of the auto matic tabulation of the carriage.

TOTAL RETRAN SF ER Four operational keys 25 to 28 are arranged, as shown in Fig. 10, on the keyboard of the calculating machine. The operational key 25 is a retransmitting key; the keys 26, 27 and 28 are, respectively, zeroizing keys for the actuator 4, the accumulator 18 and the revolutions counter 20. In Fig. 1 thestems 25, 26, 27 and 28 of the operational keys 25' to 28 are shown, respectively. Furthermore, a key 90', shown also in Fig. 2, is arranged somewhat out of alignment with the keys 25 to 23 so that the stem 90 of the key 90' is arranged adjacent the ends of slides 31 to 34, shown in Figs. 1 and 2. The slides 31 to 34 are arranged parallel to one another and are slidably supported in guides 35 (Figs. 1 and 2) forming part of the frame 3 of the machine, the slides being arranged in super-position. When the slides 31 to 34 are shifted in the direction of the arrow x in Fig. 1, they move a slide member 3", cooperating with all slides 31 to 34, to the right, the slide member being normally held in its initial position, in which it engages the slides 31 to 34, by a tension spring 37. The slide member 36 is guided by projections 36 sliding between stationary parts 36" forming part of the frame 3 of the machine.

By laterally shifting the slide member 36, a toothed wheel 38, which rotates with the hand crank 1 and is shiftably mounted on the shaft 2 of the calculating machine, is shifted to the right against the action of a spring 39 inserted between the toothed wheel 38 and a hub 3' forming part of the frame 3. By such movement to the right, a clutch 40, normally connecting crank 1 to shaft 2, is released and toothed wheel 38 is brought into engagement with an intermediary toothed wheel 41 engaging a toothed wheel 42 rigidly connected with a shaft 43. The shaft 43 carries five partially toothed driving wheels 45 to 49, as more fully disclosed in German Patent No. 907,836 and the corresponding U.S. Patent No. 2,879,938 mentioned hereinabove. The common shaft 43, connected to the toothed wheel 42 in gear with the toothed wheel 41, carries a locking disk 52 adapted to engage a locking pin 53 on each of the slides 31 to 34, said parts being more fully described in German Patent No. 907,836 and the corresponding U.S. Patent No. 2,879,938 mentioned hereinabove.

A gear segment 45a (Fig. l) on the driving Wheel 45 controls a partial-step ordinal shift of the actuator 4 to a retransmitting position. When the slide 31 is shifted to the right, a projection on the slide 31 moves the gear segment 45a into engagement with a driven gear wheel 61, mounted on a hollow shaft 67 which is coaxial with and surrounds a shaft 66. The hollow shaft 67 carries a cam disk 68 which cooperates with one arm of a two-armed rocking lever 69. The other arm of the rocking lever 69 engages a projection '70 of an escapement rack 72. The escapement rack 72 (Figs. 1, 5 and 11) is provided with saw-tooth recesses 71 and has studs 73 which slide in guides 73 forming part of the frame 3 of the calculating machine. The recesses 71 may be engaged by either of two pawls 74 and 74', rigidly or rockably connected to the carriage 4 of the actuator 4, the operation of which will be more fully explained hereinafter.

The operation or" the partial-step ordinal shift of the actuator 4 to a retransmitting position will now be explained. When rotated, the gear segment 45a, meshing with the gear wheel 61, causes one complete revolution of the cam disk 68. At the beginning of this revolution, the cam swings the two-armed lever 69 on its pivot. The pin 70 of the escapement rack 72 is thereby shifted in an ordinal direction together with the pawl 74 engaging the escapement rack 72 and secured to the actuator carriage 4 This shift involves a partial-step ordinal shift and moves the actuator 4 to a retransmitting position in which the intermediate wheels 19 or 24 (Fig. 10) engage the teeth 9 of the cam disks 9. This enables retransmission of either the accumulator 13 setting or the revolutions counter 20 setting into the actuator 4 by a rotation of the respective shafts 78 or 83, which Zeroizes the accumulator 18 or the revolutions counter 20, respectively.

The shaft '78 carries a sprocket 77 connected to a sprocket 75 by a chain 76. The sprocket 75 (Figs. 1 and 10) is rigid with a shaft 66 driven by the gear Wheel associated with partially toothed gear 46. Hence, rotation of the partially toothed gear 46 will zeroize the accumulator 18.

The shaft 83 carries a sprocket wheel 82 driven by a chain 81 also engaging a sprocket wheel 81. The sprocket Wheel 81' is rotatable with the driven gear associated with the partially toothed gear 47. Hence, rotation of the partially toothed gear will zeroize the revolutions counter 20.

In addition to the operational keys 25 to 28 shown in Fig. 10, a further operational key shown in Fig. 2, is provided; the key 90 has a stem 90 and a projection 90". Upon depression of the operational key 90', the projection 90 displaces all four slides 31 to 34 into their right-hand positions. Thus, the slide member 36 is actuated and, by opening the clutch 4t and coupling the toothed wheels 38 and 41, switches the drive of the crank 1 from the shaft 2 to the control shaft 43.

Since all four slides 31 to 34 have moved to their righthand positions, the projections thereon have shifted the respective partially toothed driving gear wheels 45 to 49 into engagement with the driven gear wheels aligned on shaft 66. Hence, when the crank 1 is driven, all five operations are carried out one after the other by the shiftable, partially toothed driving gear wheels 45 to 49 in the sequence determined by the angular arrangement of the partial toothing thereon. A more detailed disclosure is available in U.S. Patent No. 2,879,938.

The following table contains a summary of the control operations according to the above mentioned German Patent No. 907,836 corresponding to U.S. Patent No. 2,879,938 in lines 1 to 6, whereas line 7 lists the additional operation according to the present invention:

The locking pawl 74 is arranged on a member 95b (Fig. 5), loaded by a spring 95a, which is rotatable Table Designation of control slide for operational step No. Keys Key-operated control action Carriage Revolu- Carriage Actuator shiit to tions Accurnureturn zeroizing retranscounter lator to right mission zeroizlng zeroizlng position position (1) 26L Actuator zerm' "inn 32 32 (2) 27- Accumulator zeroizing. 33 (3).-- Revolutions counter zer 34 (4) I V Total 7erni7ine' 32 34 33 32 (5) Retraosfer from accumulator to 31 31 33 27. actuator. (6) {25- Retransfer from revol. counter to 31 31 34 28 actuator. (7) 90' Total transfer with carriage return. 31, 32 31 34 33 32 AUTOMATIC TABULATION OF THE CARRIAGE TO THE LEFT After a total retransmission effected by key 90', the carriage 4 is in a position all the way to the right in Fig. l, the actuator being adjusted to the value received rom the denominational places of the revolutions counter 26 opposite which it was arranged before the beginning of the total retransmission procedure.

In this initial right-most position, the value may be retransmitted into the revolutions counter 20 by means of a rotation of the crank 1 which, as more fully explained in the German Patent No. 907,836 and the corresponding U.S. Patent No. 2,879,938, after the end of the operation is automatically coupled by the clutch 40 to the driving shaft 2 of the actuator 4. It should be noted that, as a rule, the accumulator 18 is spaced apart by several denominational orders from the counter 20 for accommodating the. bearings arranged between the shafts 78 and 83. Although this expedient is not absolutely required, it avoids confusion of the numbers printed by the accumulator 1'8 and the revolutions counter 20. Since in the right-most position of actuator 4, the two left-most orders thereof are aligned with the space between the accumulator and counter, as shown in Fig. 10, these two left-most orders of actuator 4 can not be used for "a retransmission into the revolutions counter 20.

For transferring retransmitted values into the accumul'ator 18, the carriage 4 of the actuator 4 must be shifted to the left so as to align its right-most significant denominational order with the right-most denominational order 18' of the accumulator 18. A single tooth slide, more fully described in U.S. Patent No. 2,108,596, issued on February 15, 1938 to K. V. Rudin for Calculating Machine, and particularly described on page 4, left column, line 66, to page 5, right column, line 31 and shown in Figs. and 31 thereof, remains opposite the first place of the revolutions counter 20.

As shown in Figs; 1, 3 and 5, the escapement rack 72, provided with: sawtooth recesses 71, is rockable about the bearings or guides 73 and under the pressure of a compression spring 91, is urged against a stop member 93. A key 94 (Figs. 1, 3 and 11a) controls denominational escapement of the carriage 4 along the escapement rack 72. Pressure on the key 94 results in a small rotation of the escapement rack 72 about the pivots 73 in a clockwise direction as seen in Fig. 3. Upon release of the key 94, a single step escapement towards the left is effected by this rotation of the escapement rack 72, the saw-tooth recesses 71 of the escapement rack 72 engaging first a gripping pawl 74' and then a locking pawl 74 which are both arranged on a projection 74a (Figs. 3 and 4)- of theearriage 4 about the axle 95 and intercepted by the part 96. When the carriage 4 is shifted towards the right (Fig. l), the locking pawl 74 is depressed by and passes over the sawteeth 71 of the escapernent rack 72. In order to release the carriage 4 for a motion to the left, Fig. l, the locking pawl 74 must be depressed and freed from the sawtooth recesses 71.. To this end, the member 95b is provided with a laterally projecting lug 74" which engages an elongated rocking member 97 (Figs. 3, 4, 5, 8 and 11) during the entire traverse of the carriage 4 towards the left. The rocking member 97, referred to hereinafter as the left-shift rocker," is effective during a shift toward the left. It is supported by pivots 93 and urged against the stop member 93 by the lower end of the spring 91 (Fig. 3). At the point marked by the arrow 99 in Figs. 3 and 4, a key 99 (Fig. 11a) causes an anticlockwise rocking motion in. Fig. 3 of. the left-shift rocker 97 which depresses the locking pawl 74 and releases the saw-tooth recesses 71 of the escapement rack 72. Now the carriage 4 urged by the tension of its spring 5, moves leftward until it reaches its extreme left position, unless it is stopped in this path for instance by a premature engagement of the saw-tooth recesses 71 by the locking pawl 74.

COUPLING OF THE SINGLE TOOTH SLIDE WITH THE CARRIAGE OF THE ACTUATOR A pawl 138 is supported by a pivot 137 at the right of the carriage 4 (Figs. 11 and 12) and is held by a shoulder 138' on the lower end of a second pawl 140 on a shaft 139. The pawls 138 and 148 are held in the position shown in Fig. 1-2 by a tension spring 141 attached to off-set flanges thereof. The pawl 141 has an arm 140" with a double slope cooperating with a cam or pin (not shown) which revolves with the actuator 4. During each revolution of the actuator 4, the arm 140" and thus the pawl 149 are rotated about the pivot 139 sothat its end 140' slides off the shoulder 138 and releases the pawl 138 which is rotated by the spring 141 about its pivot 137. The right or posterior end of the pawl 138 upon release engages. between teeth 142' of a bar 142 of a counting tooth slide, Whereas before the pawl 138 was free to slide. over the teeth 142 without being influenced. The bar 142, supported in the machine frame, outflanks with fork-shaped arms 142" the counting tooth slide (not shown) which is shiftably arranged on the main driving shaft and advances in. a manner known per se in the art by one. tooth the oppositely arranged wheel of the revolutions counter 21) or the intermediary wheel thereof at each revolution of the actuator 4.

It will be realized that the. pawl 138 does not engage teeth 142 during the adjustment shifts of the actuator involving a shift but no rotation of the actuator, so that the bar 142 which guides the counting tooth slide (not shown) and the latter remain at rest during these steps. However, when a transmitting revolution is carried out with the actuator 4 set to a certain value, the pawl 140 releases the pawl 138. The pawl 138 is now freed to engage the teeth 142', whereby the guide bar 142 couples the counting tooth slide (not shown) to the carriage 4 for a common step-by-step motion.

The operation relative to the transfer of a dividend will now be discussed. When the counting tooth slide (not shown) reaches its extreme left-hand position and the carriage 4 of the actuator is further shifted to the left, the pawl 138 slides along the inclined sides of the teeth 142 into the respective next tooth gaps. The shoulder 138' of the pawl 138 is not displaced sufficiently to allow the end 140' of the pawl 140 to pass beyond the shoulder 138' so that the pawl 138 remains in engagement with the teeth 142', and the counting pawl slide (not shown) remains coupled to the carriage 4 of the actuator 4.

When the carriage 4 of the actuator 4 is moved by the wire 7 towards its extreme right-hand position, the guide bar 142 of the counting tooth slide (not shown) reaches its right-hand position and comes to a stop. During a further movement of the carriage 4 the pawl 138 slides towards the right along the inclined tooth flanks into the respective adjacent gaps of teeth 142. When the carriage 4 reaches its extreme right-hand position, the outer or rear end of the pawl 138 engages an inclined face (not shown) and is lifted thereby so that the end 140 comes to lie against the shoulder 138. Thereafter, when the carriage 4 is tabulated to the left for setting a new value in the actuator 4, the pawl 138 remains in its initial setting, shown in Fig. 12, in which the pawl 138 is out of contact with the teeth 142' until a revolution of the actuator is effected and the pawl 140, by engagement of the above-mentioned cam or pin (not shown) with one of the arms 140", releases the pawl 138 so that the latter may engage the teeth 142'.

If a value-setting operation of the actuator 4 is followed by ordinal escapement of the carriage 4 or by tabulation thereof to the left-end position, the counting tooth slide (not shown) has to participate in these movements to the left. To this end the pawl 140 has to be disengaged not only by revolution of the actuator 4, but

also by the two left- shift keys 94 and 99. In order to accomplish this, an arm 144 (Figs. 11 and 12) is connected with the pawl 140 and has an extension 144' arranged in front of an edge 145' of a control slide 145. The arm 144 may be rocked from the front to the rear in the machine to rock the pawl 140 in the same direction as the cams or pins (not shown) of the carriage 4 engaging the inclined ends 140". The slidably mounted control slide 145 is moved by means of a lug 145" thereon which is engaged by inclined faces 94" and 99" on the keys 94 and 99, respectively, when either of these keys is depressed so as to force the lug 145" to the rear.

It will be realized by those skilled in the art that the operation of the described coupling of the counting tooth with the carriage 4 of the actuator 4 corresponds to the coupling shown in Figs. 31 and 32 of US. Patent No. 2,108,596 issued on February 15, 1938, to K. V. Rudin for a Calculating Machine.

AUTOMATIC RELEASE OF THE TABULATION OF THE CARRIAGE In order to automatically control the leftward tabulation of the actuator carriage 4 'to align the rightmost denominational order of the actuator 4 with the rightmost denominational order of the accumulator 18 in the total retransfer operation according to the invention, the mechanism described hereinafter with reference to Figs. 3, 4, and 9 is provided. 4

At a suitable place in the machine, preferably at the right end of the left-shift rocker 97, there is arranged an automatic tabulation control slide 120 having a forwardly extending arm 120'. The control slide 120 is rockable about an axle 121 on which it is supported so as to be axially displaceable. A weak spring 122 urges the slide 120 and the arm 120 thereof against a stop 123 fixed in the machine and formed, for instance, by a face of an adjustable lever 127 supported by the shaft 127' which is fixedly connected with the frame of the machine. The operation of the lever 127 will be explained in more detail hereinafter.

A cam 124 is arranged on one of the toothed driving wheels 45-49 which are axially displaceable, for instance, on the wheel 45, which effects a partial step ordinal shift of the actuator carriage 4 for the retransfer operation. When axially displaced, the cam 124 engages a projection 125 of-a bellcrank lever 125 supported by the axle 125a, or of a swinging rocker (not shown) and rotates the same in counterclockwise direction upon a rotation of the control shaft 43. The other arm 125" of the lever 125 engages the arm 120' of the slide 120 from below and lifts the same during the last phase of the rotation of the control shaft 43, that is during the return travel of the carriage 41 toward the right.

When the arm 120' is lifted, it lifts the lug 97 of the member 97, rocking the member 97 in counterclockwise direction (Fig. 3) to disengage the pawl 74 in the same manner as when the left-shift key 99 is depressed in the direction of the arrow (Fig. 3), the carriage 4 being released to move toward the left by the spring 5. During this motion, a stop 126 of the carriage 4 engages a forwardly extending lug 120" of the slide 120 so as to move the same along toward the left until the arm 120' is withdrawn from below the lug 97 which slides off the edge 120" of the arm 120 (Fig. 4); locking pawl 74 is now released. This takes place when the locking pawl 74 is positioned to engage the tooth of the saw-tooth recesses 71 that corresponds to the desired denominational position of the carriage 4 i.e., with the rightmost denominational order of the actuator 4 aligned with the rightmost denominational order of the accumulator 18.

The operation of the arrangement described hereinabove is as follows:

Upon depression of the key the control shaft 43 is connected to crank 1 for operation thereby and all five independent operations, namely Zeroizing of the actuator 4, displacement of the actuator 4 into a denominationally intermediate retransfer position, zeroizing of the accumulator 18, zeroizing of the revolutions counter 20 and return of the actuator carriage 4 to the right are effected in the sequence just named. During the last-mentioned phase, the cam 124 imparts a swinging motion to the bellcrank lever 125 so that its arm 125" imparts a swinging motion to the arm 12%) of the slide which in turn acts upon the member 97 through the lug or projection 97"so that the locking pawl 74 is withdrawn from the saw-tooth recesses 71 of the escapement rack 72. In consequence thereof, the carriage 4 moves toward the left and, before reaching the position in which the rightmost denominational order of the actuator 4 is aligned with the rightmost denominational order of the accumulator 18, the carriage 4 starts to displace the slide 120 toward the left. For this purpose, the stop 126 abuts against the stop 120 to release the member 97 when the projection 97 slides off the edge 120'. The locking pawl 74 thereupon engages the saw-tooth recesses of the escapement rack 72 and stops the carriage 4 in the denominational position mentioned above. Thus, the carriage 4 and also the counting tooth slide (not shown), and more fully disclosed in U.S. Patent No. 2,108,596 mentioned above, which has been arrested at the first denominational order of the revolutions counter 20 (Fig. 10) are ready for a multiplication involving the retransferred amount.

Since the slide 120 has to operate only in the position of the carriage specified hereinabove, the slide 120 may 9 be carried along by the carriage 4 during further steps or shifts to the left until the carriage 4 has reached its end position.

SUPPRESSION OF THE AUTOMATIC TABULATION OF THE CARRIAGE In order to suppress the automatic tabulation of the carriage 4 to the left, if desired, the adjusting lever 127,

shown in Fig. 9 is provided. A stop face 123 and 128 are connected by an intermediary face 129. The position of the lever 127 shown in Fig. 9 corresponds to a setting for controlling tabulation to the left. However, upon counterclockwise angular displacement from the shown position, the mm 120 of the slide 120 is shifted toward the left by the stop face 128 so that the overlap of the arm 120' with the arm 125 or the lug 97' or both is discontinued. Therefore, the cam 124 has no effect on the member 97 and the carriage 4 remains in its righthand end position when the handle or crank is actuated after a depress-ion of the combined operations key 90.

ZERO ADJUSTMENT OF THE AUTOMATIC TAB- ULATION OF THE CARRIAGE The carriage 4 is stopped during a tabulation to the left in a position in which all denominational orders of the actuator 4 are arranged opposite the right-hand denominational orders of the accumulator 18. If zeros are adjusted in the right-hand orders of the actuator 4, the corresponding orders of the accumulator 18 cannot be used for calculating purposes. For this reason, the stop 126 of the carriage 4 has to be advanced by so many ceding one by the same distance, as shown in Fig. 8.

The stop members 130 are controlled by the control rings 9", rigidly connected with the cam disks 9'. The control rings 9" have circumferential recesses or grooves 131 (Figs. 6 and 7) which in the zero position are aligned with similar recesses or grooves 132 of the cam disks 9' of the actuator 4. In the rest position of the actuator 4, an arm 130 of the controllable stop member 130 engages the recess 132. This arm 130' is displaced as soon as the associated cam disk 9 is adjusted to a position differing from the zero position, i.e., to a significant digit. The stop member 130 is thereby rocked in counterclockwise direction (Fig. 6) about the pivot 130a against the force exerted by a spring 130k and is removed from the path of the stop 120" of the slide 120 so that the latter is caught by the next stop member 130 arranged to the right, as viewed in Figs. 1 and 10. Thus, as soon as the left cam disks 9' are adjusted to any position corresponding to a value, for instance, by a retransfer operation according to the present invention, the associated stop members 130 are rocked about their pivots on shafts 130a. Thus the locking pawl 74 of the carriage 4 engages the saw-tooth recesses 71 of the escapement rack 72 in that denominational position in which the lowest adjusted denominational order of the actuator is aligned with the rightmost denominational order of the accumulator 18. For the case that zeros are adjusted in the actuator to the left (as viewed in Figs. 1 and 10) of orders having significant digits set therein, or intermediate those orders having significant digits set therein, follower extensions 130" of the stop members 130 overlap adjacent lower order followers 130 to the left and form, as it were, a living bridge, to lift those stop members 130 from the grooves 131, 132 which are in denominational orders set at zero to the left (as viewed in Figs. 1 and 10) of any order having an adjusted value other than zero therein. Thus the stop members 130 remain in effective position only in the denominational orders set at zero and on the right of an adjusted value. Hence, according to the invention, the carriage 4 of the actuator 4 is stopped by the stop 126 or by stop members 130 during tabulation to the left according to the denominational position of the rightmost significant digit entered into the actuator during the retransfer operation.

In the arrangement just described, in case of a tabulation of the carriage to the left or of a tabulation followed by subsequent escapement of the carriage, and if a value has been adjusted in the leftmost orders of the actuator, the slide will be engaged and taken along by one of the stop members correspondingly far to the left so that under certain circumstances the space available for movement of the slide 120 to the left may be exceeded. Since the slide 120 has to operate only in its initial position to the right, the stop members 130 which are in normal, zero, position may be rotated by an inclined edge 134 (Fig. 8) of a member, such as a rail 135, secured to the frame of the machine, into an ineffective position with respect to the stop lug 120", the rail holding the members 130 in this position. This has the simultaneous advantage, that the members 13%), after a corresponding displacement of the carriage 4 to the left, remain out of engagement with the recesses or grooves 131, 132 in those orders to the left of incline 134 during rotation of the actuator 4.

Thus, it is seen that the simultaneous zeroizing of the accumulator 18 and of the revolutions counter 20 renders the selective retransfer either from the accumulator 18 or from the revolutions counter 20 possible by previously shifting the carriage 4 of the actuator 4 into the correctly aligned position in which the denominational orders of the actuator are arranged opposite the orders of the accumulator or revolutions counter mechanism, whereas the remaining orders, for instance of the other mechanism, are cancelled without further effects. Thus, also serial multiplication may be carried out quickly, since after a retransfer, the accumulator and the revolutions counter are available for another multiplication involving the retransferred value. However, if it is required to retransfer a value from the accumulator or the revolutions counter without cancelling the value stored in the other mechanism, the procedure disclosed in German Patent No. 907,836 and the corresponding US. Patent No. 2,879,938 mentioned hereinabove applies, namely pressing the normal retransfer key 25 in connection with the Zero key for the transmission of definite values, whereupon the drive is actuated, the values stored in either the accumulator or the revolutions counter are not cancelled, and the actuator 4 remains in its initial denominational position.

It is intended that all matter contained in the above descrlption or shown in the accompanying drawings shall be interpreted as illustrative and not in a limiting sense.

What is claimed is:

l. Ina calculator having a frame the combination comprising, an axle supported in the frame, a counter mounted on said axle and having a denominational series of rotatable digit wheels; 21 second axle supported in said frame coaxial with said first axle, an accumulator havmg a denominational series of rotatable digit wheels mounted on said second axle; a third axle extending parallel to said first two axles and secured to the frame, a denominationally shi table carriage mounted on said third axle for denominational displacement thereon and normally urged to the left from an initial right-hand position, a cyclically operable rotary differential actuator having a denominational series of number wheel elements supported in said carriage, said number wheel elements each including means settable to operate said accumulator or said counter wheels upon cyclic rotation of said actuator and means engageable by said accumulator wheels or said counter wheels to set said settable means upon zeroizing said accumulator or said counter, said settable means of said actuator number Wheel elements being adapted to cooperate with any plurality of said digit wheels ordinally aligned therewith uponshifting said carriage; a first device, said first device being adapted to zeroize the actuator and to shift said carriage by a partial step to align said engageable means of said number wheel elements of said actuator with a selected denominationally aligned plurality of adjacent digit wheels; a second device, said second device being adapted to zeroize said actuator and to shift said carriage to its initial right-hand position; a third device adapted to zeroize said accumulator; a fourth device adapted to zeroize said counter; cyclically operable drive means for said four devices, means for enabling said drive means in response to the enabling of at least one of said devices; said drive means operating said four devices in predetermined sequence during said cycle; an escapement rack supported on said frame, a spring-loaded pawl rockably mounted on said actuator carriage and having a rack-release and a rackengaging position, said spring forcing said pawl into the rack-engaging position; said rack and pawl being shaped to enable shifting of said actuator carriage to the right and for holding of said actuator carriage against shifting to the left in the rack-engaging position of said pawl; a pawl-rocking member engaging said pawl in all shifted positions of said carriage and movable from a normal inoperative position to an operative position to rock said pawl to its rack-releasing position; an axially shiftable control device urged to a normal axial position operably engaging said rocking member and being operable by said first device to move said pawl-rocking member into its operative position, said control device being engageable by said actuator carriage upon movement to a selected denominational position to shift said control device out of operative engagement with said pawl-rocking member, thereby enabling said pawl-rocking member to restore to its inoperative position at a predetermined location of the actuator carriage when the actuator is in ordinal alignment with the predetermined plurality of digit wheels; and a manually operable control lever engaging said control device and effective upon adjustment from normal position to axially shift said control device out of operative engagement with said pawl-rocking member.

2. In a calculator having a frame, an accumulator and a revolutions counter each having a denominational series of digit wheels supported in axial alignment in said frame, a dencminationally shiftable carriage supported by said frame for movement parallel to said accumulator and said revolutions counter and normally urged to the left from an initial right-hand position, a cyclically operable rotary differential actuator including an ordinal series of settable differential actuator elements supported in said carriage on an axis parallel to said accumulator and revolutions counter axis, said actuator elements being adapted to operate the digit wheels of said accumu lator or said revolutions counter upon cyclic rotation thereof and being adapted to be set by the digit wheels of said accumulator or said revolutions counter upon zeroizing the latter, an automatic tabulation control device to shift the actuator carriage to the left from its initial right-hand position into ordinal alignment with a predetermined plurality of digit wheels, said tabulation control device comprising an escapement rack supported on said frame, a spring-loaded pawl rockably mounted on said actuator carriage and having a rack-release and a rack-engaging position, said spring forcing said pawl into the rack-engaging position; said rack and pawl being shaped to enable shifting of said actuator carriage to the right and for holding of said actuator carriage against shifting to the left in the rack-engaging position of said pawl; a pawl-rocking member engaging said pawl in all 'shifted positions of said carriage and movable from a normal inoperative position to an operative position to rock said pawl to the rack-releasing position; an axially shiftable control device urged to a normal axial position operably engaging said rocking member and being op-, erable by said first device to move said pawl-rocking member into its operative position, said control device being engageable by said actuator carriage upon movement to a selected denominational position to shift said control device out of operative engagement with said pawl-rocking member, thereby enabling said pawl-rocking member to restore to its inoperative position at a predetermined location of the actuator carriage when the actuator is in ordinal alignment with the predetermined plurality of digit wheels, and means to actuate said control device.

3. In a calculator having a frame, the combination comprising, an axle supported in the frame, a counter mounted on said axle and having a denominational series of rotatable digit wheels; a second axle supported in said frame coaxial with said first axle, an accumulator having a denominational series of rotatable digit wheels mounted on said second axle; a third axle extending parallel to said first two axles and secured to the frame, a denominationally shiftable carriage mounted on said third axle for denominational displacement thereon and normally urged to the left from an initial right-hand position, a cyclically operable rotary differential actuator having a denominational series of number wheel elements supported in said carriage, said number wheel elements each including means settable to operate said accumulator or said counter wheels upon cyclic rotation of said acuator and means engageable by said accumulator wheels or said counter wheels to set said settable means upon Zeroizing said accumulator or said counter, said settable means of said actuator number Wheel elements being adapted to cooperate with any plurality of said digit wheels ordinally aligned therewith upon shifting said carriage; a first device, said first device being adapted to zeroize the actuator and to shift said carriage by a partial step to align said engageable means of said numbers wheel elements of said actuator with a selected denominationally aligned plurality of adjacent digit Wheels; a second device, said second device being adapted to zeroize said actuator and to shift said carriage to itsinitial right-hand position; a third device adapted to zeroize said accumulator; a fourth device adapted to zeroize said counter; cyclically operable drive means for said four devices, means for enabling said drive means in response to the enabling of at least one of said devices; said drive means operating said four devices in predetermined sequence during said cycle; an escapement rack supported on said frame, a spring-loaded pawl rockably .mounted on said actuator carriage and having a rackrelease and a rack-engaging position, said spring forcing said pawl into the rack-engaging position; said rack and pawl being shaped to enable shifting of said actuator carriage to the right and for holding of said actuator carriage against shifting to the left in the rack-engaging position of said pawl; a pawl-rocking member engaging said pawl in all shifted positions of said carriage and movable from a normal inoperative position to an operative position to rock said pawl to its rack-releasing position; a slide, said slide being rockably mounted in said frame, said slide being slidable along a path of motion parallel to said axles, a cam driven by said drive means, said slide being urged to a normal axial position operably engaging said pawl-rocking member and being operable by said cam to move said pawl-rocking member into its operative position, and a stop rigidly connected to said actuator carriage, said stop axially sliding said slide out of operative engagement with said pawl-rocking member upon movement of said actuator carriage to a selected denominational position, thereby enabling said pawlrocking member to restore to its inoperative position at a predetermined location of the actuator carriage when the actuator is in ordinal alignment with the predetermined plurality of digit wheels.

4. In a calculator, the combination as claimed in claim 3, further comprising, a plurality of additional stops supported by said carriage and denominationally spaced from one another, said additional stops being positioned to the left of said rigidly connected stop and denominationally spaced therefrom, each of said additional stops being associated with one of said number wheel elements, said additional stops being displaceable out of the path of said slide, a stop-adjusting member for each of said additional stops, each stop-adjusting member being actuated by the setting of said associated number Wheel element to a significant digit other than zero to displace said associated stop out of the path of said slide, and means responsive to a stop positioned outside the path of said slide to remove from the path all stops of highest denominational order to the left of the removed stop.

5. In a calculator, the combination as claimed in claim 4, further comprising, a stop return member, said stop return member being supported at a predetermined location in the frame adjacent the path of said carriage and denominationally spaced beyond the position at which said stop or said additional stops engage said slide, said return member being adapted to sequentially move any of said additional stops from the path of said slide as said additional stops respectively are shifted with the carriage past said stop return member.

References Cited in the file of this patent UNITED STATES PATENTS 1,371,138 Bair Mar. 8, 1921 1,867,002 Gardner July 12, 1932 2,108,596 Rudin Feb. 15, 1938 2,531,206 Gang Nov. 21, 1950 FOREIGN PATENTS 907,836 Germany Apr. 1, 1954 337,607 Great Britain Nov. 6, 1930

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