US3003693A - Selection mechanism - Google Patents

Description

Oct; 10, 1961 '0. K. LUNDELL 3,003,693

SELECTION MECHANISM Filed March 9, 1959 4 Sheets-Sheet 1 H L o i m D 5 6 o Mn KQWWOUO W N 02 3 9 8 I5 30 4 7 9 WZM 9m TllEi l Oct. 10, 1961 Filed March 9, 1959 mum 4 Sheets- Sheet 2 FIE E Oct. 10, 1961 0. K. LUNDELL $003,693

SELECTION MECHANISM Filed March 9. 1959 4 Sheets-Sheet 3 Oct. 10, 1961 0. K. LUNDELL 3,003,693

SELECTION MECHANISM Filed March 9, 1959 4 Sheets-Sheet 4 E I [5 Y 249 258 l Va/ue Enfr /9 Confro/ Ci cuif Sensing Circa/T United States Patent OfiFice 3,003,693 Patented Oct. 10, 1961 3,663,693 SELECTEQN MECHANISM Oral K. Lundeli, Hayward, Caiifl, assignor to Friden, Inc, a corporation of California Filed Mar. 9, 1959, Ser. No. 798,234 13 Claims. ((Il. 235 145) This invention relates to a selection mechanism for calculating machines, and more particularly to an apparatus of the type disclosed in the copending application of Gilbert J. Spesock et al., S.N. 412,042, filed February 23, 1954, for Selection Apparatus, issued February 7, 1961, as Patent No. 2,970,756.

An object of the present invention is to provide an improved selection apparatus for calculating machines, the selection apparatus being operable by an electrical system containing fewer components than heretofore possible.

It is another object of the invention to provide simplified electrical circuits for controlling a selection apparatus.

Another object of this invention is to provide a remotely controlled selection mechanism.

Still another important object is to reduce the number of the electrical components required for an electrically controlled selection apparatus.

These and other objects of the invention will become apparent to one skilled in the art from the following description of a preferred embodiment of the present invention, as shown in the accompanying drawings, in which:

FIG. 1 is a plan view of the preferred form of selection apparatus, partly broken away to show the plan of the selection bars.

FIG. 2 is a longitudinal sectional elevation through the improved machine showing the selection and actuating devices thereof.

FIGS. 3 and 4 illustrate a modification of the present invention, wherein FIG. 3 is a front and elevational view of a single pair of selection bars of the type used in the calculating machine described in the patent to F. S. Baldwin, Re. 13,841, of December 8, 1914; and FIG. 4 is a fragmentary perspective View of the rear end of the same rockable bars of said patent.

FIG. 5 is a perspective view of the selection bars in FIGS. 1 and 2, and their immediately associated components.

FIG. 6 is an enlarged detail of one of the electromagnetic devices described herein.

FIG. 7 is a schematic wiring diagram showing the remote control switches, the electromagnetic devices in the calculator and the ordinal sensing circuit.

Although the preferred form of machine to be hereinafter shown and described is in connection with a Thomas-type calculating machine, such as that shown in US. Patent No. 2,229,889, issued to Carl M. F. Friden on January 28, 1941, it is not intended that its use should be confined only to a machine of this type. It is evident that the underlying principles thereof may be advantageously applied to other types and designs of machines, as is shown in FIGS. 3 and 4 which illustrate its application to the Baldwin, or Monroe, type of selection mechanism. Mechanism which is conventional in the machine of the above-mentioned Friden Patent No. 2,229,- 889, and the copending Spesock et al. application S.N. 412,042, will not be described herein, unless necessary to provide a complete understanding of the mechanism of the present invention.

In the preferred form of the present invention, and as shown in FIGS. 1 and 2, a plurality of ordinally arranged pairs of selection bars are normally latched in a rearward 0 position against the action of suitable individual springs, and are selectively released for forward movement by operation of electromagnetic latch releasing devices, which may be controlled from a remote station. The extent of forward movement under such spring action permitted the selection bars, is selectively controlled by means of two positionable stops. The stops are controlled in their operation from a remote station by means of two electromagnetic devices. The upper edge portion of the selection bars are provided with-three notches of different lengths. An ear projects at right angles from one of the selection bars of the pair into the largest, preferably the rearward, notch of the other bar. Furthermore, each selection bar is provided with a rockable arm pivotally secured to the bar and adapted to block completely the aperture of the second notch and partially close the aperture of the forward notch. The extreme forward movement of the bars is controlled by stopping ears protruding from each bar. The intermediate forward movement of the selection bars is determined by the length of the notches into which the positionable stops and the perpendicular ear projects. The electromagnetic devices are arranged for selective operation in accordance with the required predetermined digits to be entered into the calculating machine. Two selection bars are provided for each ordinal series of digits from 1 to 9, inclusive, one of the bars serving the lower order digits, conventionally from 1 to 5, inclusive, and the other bar serving the higher order digits, usually from 6 to 9, inclusive. Therefore, the notches in the selection bars represent low order and high order digits of predetermined value. For example, the notches in one of the bars would represent values as follows: The forward notch, values of l, 2, 6, and 7; and the second, or intermediate, notch, values of 3 and 8.

' For a digit of 4, the lower order bar is unlatched and allowed forward movement until it is stopped by the ear (here shown as projecting at right angles from the 6 to 9 bar) engaging with the rear edge of the third notch in the l to 5 bar. A digit of 5 is obtained by unlatching both the high and the low ordinal selection bars and allowing them their fullest forward travel, the l to 5 bar being stopped in its 5 value position and the 6 to 9 bar moving five increments to a 0 position forward of its 9 value position. For the digit 9, the higher order selection bar is unlatched and allowed forward movement until the ear projecting therefrom abuts the forward edge of the rearward notch in the co-ordinal 1 to 5 slide and thereby prevents further forward movement of this slide.

Selection and actuating mechanism Within the cover of the above-mentioned patent, and as shown in FIGS. 1 and 2, there is provided a right side frame plate 11, an inside auxiliary left side frame plate 12, and also an outside auxiliary left side frame plate 13. The above-mentioned frame plates are secured by suitable fasteners 14 to a base 15 (see FIG. 2), and are interconnected by various crossframes including a front cross-bar, or comb, 33, an intermediate bearing plate 16, a central bearing plate 17 and a rear bearing plate 18, for supporting various mechanisms, including the selecting and actuating mechanism.

Mechanism is provided for entering values into the accumulator numeral wheels, or dials, including a pair of ordinally arranged selection bars, selectively operable by mechanism later to be described. For this purpose, each order of digits is represented by a pair of selection bars 25 and 26, as shown in FIGS. 1 and 5 The selection bars 25 and 26, when suitably operated, will provide for entering into the calculator a digital value of from 1 to 9, as required. Conventionally, the left-hand one of the selection bars 26 is operable to serve the entering of digits of the relatively low values of from 1 to 5, and the other selection bar 25 is operable to enter into the calculator digits of the relatively high value of from 6 to 9, inclusive. Each selection bar is supported for endwise reciprocating movement by a pair of parallel arms 27 and 28 (see FIGS. 2 and 5). The rearward ends of the selection bars 25 and 26 -(at the top in FIG. 1, or to the right in FIGS. 2 and 5) are provided with yokes 29 and 30, respectively, which engage coacting annular grooves provided in the hubs of a pair of selection gears 31 and 32, respectively (see FIG. 2). These selection gears 31 and 32 are slidably mounted on a rotatable square shaft 33 which is suitably journalled in the bearing plates, or crossframe members 16, 17 and 18 extending transversely across the machine.

When either of the selection bars 25 or 26 is moved forwardly, to the left as viewed in FIG. 2, it operates to move either the gear 31 or 32 into alignment with one of the differentially stepped teeth on a coordinal stepped drum, or Thomas-type, actuator 36 secured on an ordinally related actuator shaft 37. The shafts 37 are journalled between the bearing plate 16 and the central bearing plate 17, and are power-driven from an electric motor 38 by way of a main drive shaft 39 extending transversely of the machine and suitably journalled in the frame plates 11 and 13, in a conventional manner. A plurality of bevel gears 46 are secured to the main drive shaft 39, and each meshes with a bevel gear 4-1 which is secured to each actuator shaft 37. It is conventional in the machine of the above-mentioned Friden patent to mount two actuator drums 36 on each shaft 37, whereby one such shaft can serve two orders of the selection mechanism. The shaft 39 is operable cyclically in one direction by conventional clutch control driving means (not shown) provided in the calculator and is the only path of power flow from the motor 33.

A plus-minus, or digitation, sleeve 45 is slidably mounted on the rear end of each square shaft 33, and is provided with an add gear 46 and an oppositely disposed subtract gear 47. These gears are arranged to cooperate selectively with an accumulator gear 48 secured to the lower end of accumulator dial shaft 46, the latter being suitably journalled in the frame 50 of the shiftable numeral wheel carriage 51. Secured to the shaft 49 above the frame 56 is a dial 52 bearing the numerals 0 to 9. The add and subtract gears 46 and 47 are normally maintained in the disengaged, or neutral, position shown and are positioned by a conventional plus-minus gate 53 mounted on a pair of arms 54 (only one being shown) affixed to a digitation control shaft 55. Whenever gears 46 and 47 are maintained in their neutral position by the action of a centralizer (not shown) the carriage 51 may be shifted laterally across the machine by conventional mechanism (not shown) without interference from either gear. In digitation, however, the shaft 55 and gate 53 are rocked one way or the other to shift the spool 45 along the square shaft 33, so that one of the gears 46 or 47 meshes with the accumulator gear 48.

It will be understood that there are plus and minus keys provided in the calculating machine for controlling the operation of the machine in addition and subtraction operations, and that the amounts required for entry into the machine for accumulation therein are registered by the indicating wheels 52.

During both additive and subtractive registration of values in the numeral wheels 52, suitable transfer mechanism of conventional construction may be operated to effect a tens-transfer, as disclosed, for example, in said patent.

The present invention provides a means for controlling the operation of the selection bars 25 and 26 in the calculator. The selection slides 25 and 26 are arranged in pairs, as shown in FIGS. 1 and 5, the number of pairs usually being sufficient for ten orders. The lower, or units, order position, as shown in FIG. 1, is indicated at the right, and the higher orders progress therefrom toward the left. In each order, and operable to replace the usually manually operable keys normally found in calculators, are four electromagnetic devices 61, 62, 63 and 64, inclusive, preferably arranged in transverse banks shown in FIG. 1, which, as shown in H6. 2, are constructed and arranged to be operable to selectively control the operation of the selection bars 25 and 26. Hereinafter, the electromagnetic devices will be referred to as follows: 61 as Hi; 62 as Lo; 63 as A; and 64 as 63.!

The electromagnetic devices A and B" for each order are operable as stops to limit the extent of forward movement of the selection bars 25 and 26. The Lo electromagnetic devices 62 are operable to selectively release the selection bars 26, which bars control the entering of the low digits 1 to 5 into the calculating machine. The Hi electromagnetic devices 61 are operable to selectively release the other selection bar 25 for forward movement (to the left in FIG. 2), which bar controls the entering of the high digits 6 to 9 into the calculating machine.

The electromagnetic devices 61 to 64, inclusive, in each order, are included in an electrical system (see FIG. 7) extending from remote control switches, such as may be found in a typewriter or other suitable control means, to the calculator in order that the selection bars 25 and 26 may be controlled by the operation of the switches provided in the remote control circuit.

Each selection bar 25 and 26 is normally maintained in a rearward position, as shown in FIG. 2, by means of respective latches pivotally supported on the selection bars and operable to engage a fixed slotted latch plate 68 which is supported between side frames 69 and 76 of the electromagnetic device support structure 71. For example, the selection bar 26 (see FIGS. 2 and 5) is provided with a latch 74 pivotally supported on a pin, or stud, 75 secured to the selection bar 26. It is normally biased by means of a spring 76 (FIG. 1) to engage a wall of the fixed latch plate 6%, the spring 76 being attached at one end to the latch finger 74- and at the other end to the selection bar 26. The selection bar 25 is likewise provided with a pivotally supported latch 78 pivoted on a pin, or stud, 79 which is secured to the selection bar 25. The latch finger 78 is normally urged into latching position by means of a spring 81 one end of which is attached to the latch finger 78 and the other end is attached to the selection bar 25. Preferably, both latch arms 74 and 78 are notched at their free ends to form shoulders adapted toengage the forward wall of a respective notch in the plate 68 or the rearward edge of the latch plate 68. A tension spring 82 is attached at one end to the parallel arms 27 and at the other end to a slotted guide brace 83, to provide means for normally urging the selection bars 25 and 26 forwardly, which forward movement of the selection bars 25 and 26 is normally prevented by means of the respective latch fingers 74 and 78, mentioned above.

Actuation of selection bars The latch fingers 74 and '78 of selection bars 26 and 25, respectively, are adapted to be controlled by the Hi and Lo electromagnets 62 and 61, respectively, one of which is operated each time a selection bar is required to be moved in the operation of the selection mechanism. If a digit to be entered into the machine is of a relatively low value and the selection bar 26 is required to be operated, the L0 electromagnetic device 62 is energized by an electrical circuit (later to be described) to bring about release of the latch finger 7 4 from engagement with the latch plate 68. If, however, the digit to be entered into the calculator is of a relatively high value, the Hi electromagnetic device 61 is energized to release the latch finger 78 from engagement with the latch plate 68. Both of these electromagnetic devices 61 and 62 operate the respective latches 78 and 74 by means of spring-operated slides 88 and 89, respectively, as will hereinafter be described in connection with the construction and operation of the electromagnetic devices. When either of the latch fingers '74 or 78 is released, at any time, from engagement with the latch plate 68, the respective selection'bar 26 or 25, as the case may be, is moved forwardly (to the left in FIGS. 2 and 5) by the spring 82.

The extreme forward movement of the selection bars 26 and 25 is controlled by stop cars 84 and 85 projecting upwardly from the selection bars 26 and 25, respectively. An L-shaped stop 36 is secured to the forward edge of latch plate 63 in such a manner that the stop cars 84 and 85 will abut against the stop 56, thereby limiting the extreme forward movement of the bars. This extreme forward movement of the selection bars is theequivalent of five differential, or value, increments, and represents a value of 5 in the case of bar 26 and a value of in the case of bar 25 (in this case the bar 26 positioning its selection gear 31 opposite the free space between the two sections of actuator 36). The extent of intermediate forward movement of the selection bars 26 and 25 is determined by spring-operated stop slides 90 and 91 controlled by operation of the A and B electromagnetic devices 63 and 64-, respect-ively. The spring-operated stop slides 90 and 91 are operable to enter one or both of a pair of notches provided in the selection bars, so that the bars may, be moved a predetermined distance forwardly until a portion of the notch thereof comes into contact with the stop slide of the electromagnetic devices.

The 1 to selection bar 26 is provided with three notches 110, 111 and 112 in its upper edge portion. Each notch is of progressively greater length than the one before, i.e., the foremost notch 1ft) is the shortest and the rearmost notch 112. is the longest of the three; Likewise, the 6 to 9 selection bar 25 is provided with three notches 113', 114 and lid in its upper edge portion, and, again, the foremost notch 113 thereof is the shortest in length, the second rearward notch 1214 is about half again as long as the foremost notch, and the rearmost notch 115 of this selection bar 25 is about three times as long as the first notch. The notch 115 is provided with a perpendicular car 92 projecting to the left from this bar (see FIG. 5) into operable engagement by the forward and rearward edges of the rearward, and longest, notch 112 provided in the adjacent selection bar 26. The notches in each of the selection bars 25 and 26 are in paired relationship with the notches of the other bar.

The 1 to 5 selection bar 26 is provided with a rockable arm 93, which is pivotally supported thereon by a stud, or pin, 94, the arm 9'3 extending forwardly from the pivot pin (to the left in FIG. 5). On the forward extremity of the rockable arm 93 is a finger 95 extending along the rearward portion of the foremost notch 110 of the selection bar 26. Midway of the ends of the arm 93 is a hump 96 formed thereon, which hump blocks completely the aperture of the middle notch 111 of the selection bar 26. The arm 93 is normally springbiased to its raised position (clockwise in FIG. 5) by a spring 97 extending between a pin 98 on the 1 to 5 selection bar,26 and another pin 99 extending from the arm 93. The pin 99 serves as a stop for preventing over-rocking of the rockable arm 93. Likewise, the 6 to 9 selection bar 25 has a rockable arm 100 pivotally supported thereon by a pivot pin, or stud, 101, the arm extending forwardly from the pivot stud. The arm 100 has a finger 102 formed on the forward extremity thereof, which finger 102, lies along the rearward portion of the foremost notch 113 of this bar. Midway on the arm 100 is a hump 103 formed thereon, which hump blocks completely the aperture of the middle notch 114- of this bar. The rockable arm 100 is normally maintained in a raised position (in a clockwise direction in FIG. 5) by a spring 104 tensioned between a pin 105 mounted on the bar 25 and a pin 106 extending from 6 the rockable arm 100, which stop for the rockable arm.

In operation, the stop slides and 91 are operable to enter into the notches provided in the upper edge surface of the selection bars, so that the selection bars may be moved a predetermined distance forwardly until the rear edge of the notch or the end of either finger or 1M comes into contact with the respective stop slide. For example, the 1 to 5 selection bar 26 is provided with the relatively small notch 11!) (see FIG. 5) in its forward upper edge portion, the notch having a length equivalent to two incremental, or value, steps. When the spring-operated stop slide 91 of the B electromagnet is released to enter into the space provided bythe notch 11d, and the selection bar 26 is allowed to move forwardly by release of its latch finger 74, the selection bar 26 will move until the forward edge portion of the finger 95 of arm 93 engages the stop slide 91, thereby positioning the bar 26 for entering the digit 1.

However, if the arm 93 is rocked out of the way, the bar 26 can move forwardly two steps to register a value of 2, in which case the bar moves forwardly until the rear edge of notch 1M engages the stop bar 91. This action is secured by the joint operation of both stop slides 90 and 91 and their respective notches. Slightly rearward of the forward notch 1.19 is the second notch 111 in the upper edge of the selection bar 26, which second notch has a length equivalent to three incremental, or value, steps. The second notch 3111 is arranged so as to receive the spring-operated stop slide 96 of the A electromagnet.

pin 106 also serves as a When the A electromagnetic device 63 is energized simultaneously with the B electromagnet, the stop slide 9% will operate to enter the second notch l1 whereupon it will abut against the upper edge of the hump 96 of arm 5 3 and thereby rock this arm 93 (counterclockwise in FIG. 5) against the tension of the spring 97. Simultaneously, the stop slide 91 enters notch lit), so that the selection bar 26 can move forwardly until the rear edge of notch lllti engages the stop slide 91. That is, the intermediate 2 position of this selection bar is determined by the simultaneous operation of the Lo, the A, and the B electromagnetic devices. The L0 electromagnet will unlatch the l to5 selection bar; the operation of the A electromagnet will allow the stop slide 9% to engage the hump and rock the roclrable arm 93 (counterclockwise in FIG. 5) to remove the finger 95 from partially blocking the foremost slot and the B electromagnet is energized to release the stop slide 91 so that it can drop into the foremost notch 110. Thus the selection bar 26 is moved forwardly by its spring 82, and the rearward edge of the slot 11f will abut the stop slide 91 and stop the forward movement of the bar.

If a digit 3 is desired, the A electromagnet 63 will be simultaneously energized with the energization of the L0 electromagnet. The energized A electromagnetic device will release its stop slide 90 so that the stop slide can drop into the second notch Ill. Thus, as the l to 5 selection bar 26 moves forward after the latch 74 is released by the L0 electromagnetic device, it will be stopped by the stop slide 90 abutting the rearward edge of'the second notch 111, to limit the forward movemen of the bar in its 3 position. Slightly rearward of the second notch 11 1 is the third notch 11?. formed in the upper edge portion of the selection bar 26, which notch 112 is about twice as long as the second notch 111. To enter the digit of 4 into the accumulator of the calculator, only the Lo electromagnetic device is solely operated to release the selection bar 26 for forward movement. Forward movement of the bar is interrupted by the abutment of the rear edge of the third notch 112 with the rear edge of the right angle car 92 of the latched 6 to 9 selection bar 25.

If a digit 5 is desired, the Hi and L0 electromagnetic devices will be energized, releasing both of the selection bars 26 and 25 for forward movement by their respective springs 82. With release of the latch finger 74 of the 1 to 5 selection bar 26, this bar 26 will be allowed its fullest forward movement, where it is stopped by the stop ear 84 abutting the stop plate 86. As the 1" to 5 selection bar 26 moves forwardly, the 6 to 9 selection bar 25 will also move forwardly (to an active position), and the 1 to 5 selection bar 26 will move to its 5 position, for the rear edge of the third notch 112 will not engage the rear edge of the perpendicularly formed car 92.

Also, the 6 to 9 selection bar 25 has a first, or forward, notch 113 provided in its upper edge, which notch 113 will be aligned with the first notch 111 of the 1 to 5 bar 26. Therefore, if a digit 6 is desired, the Hi electromagnet 61 will be energized to release the finger '78 from engagement with the latch plate 68 and the B electromagnet will be energized to release its stop slide 91. The stop slide 9-1 will move downwardly into the first notch 113, where it will be engaged by the forward edge of the finger 162 of the rockable arm 1% to stop the 6 to 9 selection bar 25 in its first, or 6 value, position.

Again, if the arm 1110 is rocked out of the way, the bar 25 can move forwardly two steps, for notch 113 also has a length equivalent to two incremental, or value, steps. In this event the bar 25 moves forwardly until the rear edge of notch 113 engages the stop bar 91. This action is also secured by the joint action of stop slides 90 and 91 and their respective notches. Slightly rearward of the first notch 113 is the second notch 114, which notch 114- is about half again as long as the first notch 113, for it has a length equivalent to three differential, or value, steps. Thus, when a digit 7 is desired, the Hi electromagnet is energized, releasing the 6 to 9 bar 25 for forward movement. Simultaneously with the energizing of the Hi electromagnetic device, the A and B electromagnets are energized to provide another intermediate stop for this bar. The energization of electromagnets A and B will release their spring-operated stop slides 91 and 9-1, respectively, whereby the A electromagnet stop slide 90 will abut the hump 1133 of the rockable arm 111i), rocking it downwardly, or counterclockwise in FIG. 5. The rocking of this arm will remove the finger 1112 from partially blocking the first notch 113. The B electromagnet stop slide 91 will drop into the first notch 113, where it will be engaged by'the rearward edge of this notch to position the 6 to 9 selection bar 25 in a 7 position.

If a digit 8 is desired, the Hi electromagnet will be energized, releasing the 6 to 9 selection bar 25 for forward movement, in a manner previously described, and simultaneously the A electromagnetic device will be energized to allow its stop slide 91) to drop into the second notch 114. It therefore can be seen that the rearward edge of the second notch 114 will engage the stop slide 90 to limit the forward intermediate movement of the bar 25 to an 8 position.

Slightly rearward of the second notch 114 is the third notch 115 formed in the upper edge of the 6 to 9 selection bar 25, from which projects the perpendicular ear 92. Therefore, when the digit 9 is desired, only the Hi electromagnet 61 will be energized, releasing the selection bar 25 for forward movement. The forward movement of the 6 to 9 selection bar 25 is stopped by engagement of the forward edge of the perpendicular car 92 with the forward edge of the third notch 112 of the latched 1 to 5 selection bar 26 to position the 6 to 9 bar in its 9 position.

Each of the pairs of selection bars 25 and 26 is provided With the same number and sizes of notches and the arrangement of the notches is the same in each case. The banks of ordinally arranged electromagnetic devices 63 and 6 1 are both operable to control the movement of the pairs of selection bars 25 and 26, since the spacing of the bars is approximately the same as the width of the spring-operated stop slide controlled by the electromagnetic devices 63 and 64, respectively. The shaft 49 will drive the numeral wheels 52 in the required direction to register the amounts desired to be registered in the calculating machine, The transmission of power from the actuating cylinder 36 to the gear wheels 31 and 32 to enter required amounts into the calculating apparatus is the same as occurs in similar operations in a calculating apparatus of conventional form and not equipped with this invention. For example, if numeral keys in the manually operated calculator of conventional form were selectively operated for the same value as the electromagnetic devices 61 to 64, inclusive, the amounts entered into the calculating apparatus would be the same.

Electromagnetic devices Each electromagnetic device 61 to 64, inclusive, comprises, as best shown in FIGS. 2 and 6, an energizing coil supported on a post 113 mounted on an L-shaped frame 119 by means of a screw 120, or other suitable mounting means. The L-shaped frame 119 extends between the side frames 69 and 711 of the electromagnetic device support structure 71. Each of the electromagnetic devices is provided with an L-shaped armature 121, one leg of which armature passes through an aperture 127 in the L-frame 119. The L-shaped armature 121 carries a hook portion 122 at its lower, free end. The hook portion 122 is operable to engage a shoulder 123 formed on the side of the spring-operated unlatching slides 88, 89 and the stop slides 96, 91, inclusive. The slides are apertured at spaced points and supported for slidable movement in a downward direction on a pair of pins, or screws, 124 and 125 affixed to their respective frame 119. Preferably, the lower pin 124 extends rearwardly from the slides 88 to 91, inclusive, so that it engages not only the lower slots in the slides but forms an anchor for a pair of springs, as will hereafter be described. A relatively large-headed screw 125 extends through the upper aperture in the slides 83 to 91, inclusive, and is also mounted in the frame 119. The slides 88 to 91, inclusive, are normally urged in a downward direction by means of a suitable spring 128, one end of which is secured to a lip 126 of the slides 88 to 91, the other end of the spring being secured to the pin 124. The L-shaped armature 121 of each electromagnetic device is pivoted at a point where it passes through the frame 119, and is provided with a biasing spring 129, one end of which is secured to the upper portion of the armature 121, while the other end is secured to the pin 124. In the position shown in FIG. 2, the armature 121 is operating to hold the slides 88 to 91, inclusive, in an elevated position, with the first-mentioned spring 128 tensioned and ready to thrust the slide downwardly. When an electromagnetic device is energized, the armature 121 will be rocked on its fulcrum and the hook por tion 122 thereof will be removed from engagement with the shoulder 123 of the respective slide. Release of the hook 122 of the armature from the shoulder 123 of the slide will allow the slide to be thrust downwardly under action of the spring 128. Thus, it is apparent that the electromagnetic devices may be set with the slides 88 to 91 in an upwardly latched position and ready for operation relative to the selection bars 25 and 26. The unlatching slides 83, 89 and the stop slides 96, 91 are provided with an outwardly extending lip 1311, which may be engaged by one free end portion 131 of a lever 132 which is pivotally supported in the frame 119 on a transverse rod 133. The rod 133 serves as a support for a bank of levers 132 of a bank of electromagnetic devices (see FIG. 1) which are distributed in ordinally spaced relationship along the common L-shaped frame 119.

The restoring of the actuated slides 83 to 91, inclusive, and the actuated armatures 121, after de-energization, may be accomplished by operation of restoring bars 135 (FIGS. 1 and 2), one of which is provided for each order of the selection apparatus. The restoring bars 135 are supported for endwise movement on the apertured latch plate 68 by any suitable means, such as elongated apertures 136 (see FIG. 1) provided in the restore bars 135 to accommodate relatively large-headed rivets 137 which are mounted in the latch plate 68. The restore bars 135 are provided with apertures 138, located at properly spaced points to accommodate end portions 139 of the bellcrank lever 132, each of which serves as a restore member for the individual slides of the respective electromagnetic device. When the restore bars 135 are moved rearwardly, the bell-crank levers 132 are all operated to restore any of the slides 88 to 91, inclusive, which have been released to operative position.

Restoring of selection bars Simultaneously with the operation of the restore slides 135 and the slides 88 to 91, inclusive, of the electromagnetic devices 61 to 64, inclusive, the pairs of selection bars 25 and 26 of each order are restored to normal position, so that their respective latch fingers 78 and 74 are in engagement with the latch plate 68 and in the position in which the selection bars 25 and 26 are under the tension of the spring 82 provided for each slide. The preferred restoring means for the electromagnetic devices 61 to 64, inclusive, and the selection bars 25 and 26 comprises a bail member 142 secured in any suitable manner, such as by welding, to a pair of depending arms 143 and 144 (see FIG. 1), which arms are rigidly secured to elongated collars 158 and 159, respectively, that are pivotally supported on a transverse shaft 145. The shaft 145 is suitably journalled in the parallel legs of a C-shaped bracket 146, which is suitably fastened to the side frames 69 and 76 of the support structure 71 by suitable fasteners such as screws 147.

The bail 142 extends transversely between the depending arms 143 and 144, forwardly of the restore slide 135 and the selection bars 25 and 26. The restore bail 142 has two rows of adjustable screw members 148 mounted thereon. The screw members 148 are arranged in two rows at spaced intervals, the upper row of which is arranged to registerwith the restore slides 135 of the vari ous orders and the lower row is arranged to register with the ordinal pairs of selection bars 25 and 26. The head portion of the adjustment screw members 148 is large enough in diameter to contact and move the ordinal restore slides 135 and the ordinal pairs of actuated selection bars 25 and 26. The adjustment screws 148 are provided with suitable lock nuts to hold them in their adjusted position, and the screws may be adjusted relative to the parts to be engaged by the head portion thereof. For example, the adjustable screw 148 in the upper row may be adjusted relative to the individual restore slides 135, so that each slide 135 will, upon operation of the bail 142, move the required distance to reset back to the normal, inoperative position the actuated slides 88 to 91, inclusive, of the electromagnetic devices 61 to 64, inclusive. The adjustment screws 148 in the lower row may be adjustably set relative to the individual orders of the selection bars 25 and 26, so that upon operation of the bail 142 (counterclockwise in FIG. 2), the selection bars 25 and 26 will be moved rearwardly against the action of their associated spring 82 until the latch fingers 78 and 74 engage their required position in the latch plate 68.

Two restore solenoids 151 and 152 (see FIG. 1), of conventional design, are provided to restore the movable parts of the selection apparatus to the normal condition through operation of the bail 142. The twin restore solenoids 151 and 152 arearranged as shown in FIG. 1 wherein one solenoid 151 is at one corner of the support structure 71 and the other solenoid 152 is disposed directly opposite, and in the same plane as the first solenoid 151, to insure that there will be uniform rocking at each end of the bail 142 to prevent undue bending of the bail member. The restore solenoids 151 and 152 are mounted between the flanges of the cross-member of the C-shaped bracket 146, as shown in FIG. 1, adjacent the sides of the frame 7h The plungers of the solenoids 151und 152 pass through apertures in the flanges of the bracket 146, and are in active contact with an insulated rod 155 (see FIG. 2). The rod 155 is suitably secured to a pair of forwardly extending arms 156 and 157, which arms are suitably secured to collars 158 and 159 pivotally mounted on shaft 145. The collars158 and 159, respectiveiy, mount the bail legs 143 and 144, which are rigidly secured to their respective collars. It, therefore, can be seen that upon simultaneous energization of the solenoids 151 and 152, the plungers thereof will rock the rod 155 and its arms 156 and 157 (counterclockwise in FIG. 2) about the pivot shaft 145. Furthermore, with the rocking of the arms 156 and 157, the interconnecting collars 158 and 159 will rock the bail legs 143 and 144 (counterclockwise) in such a manner that the bail member 142 will restore the slides 135 and selection bars 25 and 26 in the manner previously described. A return spring 169 is provided for returning the bail 142 to its normal inactive position, which spring is fastened between a lip of the bail 142 and a lip projecting from the hracket 146. The operation of the restore circuit (not shown) and resulting simultaneous operation of the restore solenoids 51 and 152, may be employed whenever it is desirable or necessary to restore the selection bars 25 and 26 and the electromagnetic devices 61 to 64, inclusive, to their normal condition. Restoring of the selection bars 25 and 26 and the restoring of electromagnetic devices 61 to 64, inclusive, will have no eilfect on the accumulator apparatus in the calculating machine, which may be operated in its usual manner or by remote control (not shown).

it will be appreciated that as digits are added into the calculating apparatus and it is necessary to carry from one order into the next order, the calculator apparatus operates in the usual manner and the carriage thereof moves as required to put the values in the required ordinal position.

Readout mechanism The calculating apparatus of the present invention can be, if desired, equipped with a conventional readout mechanism. As shown in FIG. 2, the readout mechanism 165 is provided with means for operating electrical switches constructed and arranged so that the amounts registered in the accumulator dials 52 of the calculating apparatus may be, in effect, read out of the calculating apparatus and transmitted as signals through an electrical system to operate a remote recording means, such as an electric typewriter. It will be appreciated that the readout mechanism referred to above is of conventional design and that such parts are operated in their usual manner, therefore, they form no part of the invention presently being described. Such a readout mechanism is shown and described in the above-mentioned Spesock et al. patent previously mentioned, to which reference may be had for a full and complete disclosure.

Electrical circuit As shown in FIG. 7, the electrical system of the present invention is comprised of three major circuits: the remotely located control circuit, such as the switches found in an electric typewriter; the sensing circuit for sensing the ordinal electromagnetic devices to be energized relative to the control circuit, i.e., the position of the typewriter carriage; and the value entry circuit of the selection apparatus.

It will be seen by reference to FIG. 7 of the accompanying drawings, that the selection apparatus, or value entry, means consists of a plurality of electromagnetic devices 61 to 64, inclusive, and is provided to, in effect, take the place of the usual manual keyboard found in calculating machines of the type heretofore mentioned. In the drawing, ten orders of electromagnets are shown to serve the same number of ordinal pairs of selection bars in the calculating apparatus. The dash-dot line enclosing the value entry circuit in the drawing indicates the apparatus that will be found on the supporting structure 71 of the selection apparatus of the calculating machine. The dashdot lines enclosing the control circuit and the sensing circuit indicates the apparatus that will be found in a remotely located control system, such as a typewriter mentioned above. For the sake of simplicity, the switches located in the control circuit of the drawing will hereinafter he referred to as those switches that are found in a typewriter, which switches are actuated or closed by the operation of a typewriter numeral key. The typewriter switches 17-1 to 179, inclusive, represent the numeral values of l to 9, inclusive, and the switch 133 represents a space, and conventionally would be closed by the mechanism that raises the ribbon for printing in a typewriter. It can be seen that the typewriter switches 171 to 17?, inclusive, close circuits for controlling the energization of various electromagnetic devices 61 to 64, inclusive, which devices control the operation of the value entry mechanism for entering a predetermined value into the calculating machine. For example, assume that the value of l is typed by the electric typewriter and that the typewriter carriage is in its rightmost end position, which position is relatively associated with the tenth, or highest, ordinal positon of the calculator. The circuit for energizing the tenth order electromagnetic devices is as follows: From a DC. power supply 185 to the movable contact of an off-on switch 186, along a conductor 187, a conductor 18% of the control circuit, through the closed contact of the numeral 1" typewriter switch 171, in parallelthrough current directing diodes 189 and 196), through two conductors 191 and 192, to the winding of the L electromagnetic device 62 and the winding of the B electromagnetic device 64 in the tenth order of the selection apparatus, through current directing diodes 193 and 194, two conductors 195 and 196, a common conductor 197, a tenth order contact 198, and movable contacts 199 and 199 of a stepping switch 260, a conductor strip 201, a conductor 2192, to power supply 185. Simultaneously with the clos ng of switch 171, the switch 189 is closed by the typewriter linkage, not shown herein, thus supplying current to the step switch winding 205 and energizing the winding 205 through the off-on switch 186, conductor 187, a conductor 2116, switch 181), a conductor 29'), a conductor 268, to DO supply 185. Energizing coil 205 attracts the armature 2G9, moving the actuator hook 211? into contact with the next tooth of the step switch ratchet 211. The de-energization of the winding 205 by opening of the contacts of switch 180 would allow the armature 209 to return to its normal inactive position shown in FIG. 7, by a spring, not shown. The cycle of operation of armature 2% and the hook 210, will rotate the ratchet 211, and the movable contacts 199 and 199 secured thereto, to the next lower position of the step switch 200.

When the numeral 2 is typed by the typewriter and the switch 172 in the typewriter is closed, the L0, A and B electromagnetic devices 62, 63, and 64 in the then operative ordinal position of the selection apparatus (ninth order in this instance), will be energized to condition the calculator for entering the value of "2 in this ordinal position. -In this case, the circuit for simultaneously operating the L0, A, and B electromagnetic devices may be traced as follows: From the power supply 135, to switch 186, along conductor 187, conductor 188, the numeral 2 typewriter switch 172, in parallel, through three current directing diodes 215, 216 and 217, thence from diode 215 along conductor 192, from diode 216 alongconductor 213, and from diode 217 along a conductor 191, respectively; from lead 192 to Lo winding of electromagnetic device 62 in the ninth ordinal position, from lead 218 to the A winding of electromagnetic device 63 in the ninth ordinal position, from lead 191 to the B winding of electromagnetic device 64 in the ninth ordinal position, respectively; thence through current directing diodes 219, 221), and 221, respectively; and thence through conductors 222 and 223, to a common conductor 224, ninth order contact 225 of the sensing circuit, movable contacts 119 and 199' of step switch 290*, conductor strip 261, conductor 2t12, to the power supply 135. Simultaneously with the closing of switch 172, the switch 181) is closed and again current is supplied to the winding 205 of step switch 2%. Thus, again the winding is energized and the armature is attracted thereto for cocking the hook 210 into engagement with the next tooth of the ratchet 211. When the switch is opened and winding 205 deenergized, the hook 216 will step the ratchet 211 to the next, or eighth, order position in a manner similar to that previously described. Again the electrical system will be conditioned for actuation in the next ordinal position relative to the carriage position of the typewriter.

The typing of the numeral 3 by the typewriter will result in the closing of the numeral 3 switch 173 in the then operative, i.e., the eighth ordinal position. The circuit for simultaneous operation of the L0 and A elecromagnets 62 and 63 in the proper ordinal position is as follows: From the source of power 135, swich 186, conductor 187, conductor 1138, switch 173, diodes 228 and 229, in parallel; conductors 192 and 218, in parallel; the winding of the L0 electromagnetic device 62 and the winding of the A electromagnetic device 63 in the then operative ordinal position, in parallel; diodes 234) and 231 in parallel; conductor 232, conductor 233, the eighth position contact 234, movable contacts 199 and 199, conductor strip 261, conductor 262, and back to the source of supply 1%. Again the switch 180 will simultaneously be closed with the switch 173 by the operation of the typewriter mechanism, and the winding 2115 energized to cock the hook 210 in readiness for stepping the step switch to the next, or seventh, position of the step switch 200, in the manner previously described, as soon as the switch 181) is opened.

The actuation of the numeral 4 key in the typewriter will result in closing of the numeral 4 switch 174 and energize the coil of the L0 electromagnetic device 62 in the seventh order of the selection apparatus. The circuit for the operation of the electromagnetic device 62 in the seventh ordinal position may be traced as follows: Source of current supply 135, oil-on switch 136, conductor 187, conductor 1S8, switch 174 of the control circuit, conductor 192, seventh ordinal electromagnetic device 62, diode 238, conductor 239, conductor 240, seventh position contact 241 of the step switch 201 movable contacts 199 and 199', fixed conductor strip 201, conductor 202, to the negative side of the source of current supply 185. Also, as pointed out above, as the switch 174 is closed, the switch 131 is simultaneously closed therewith to energize the winding 2115 of the step switch 2% for stepping the movable contacts 119 and 199 to the next, or sixth, step position.

The closing of the numeral 5 switch in the remote control circuit will result in the energization of the L0 and Hi windings of the electromagnetic devices 61 and 62 in the sixth ordinal position of the selection apparatus. The energization of these two electromagnetic will operate to release the selection bars 25 and 26 for their fullest forward movement, whereby the selection gear 32 in the calculating machine will move into register with, and be rotated by, five teeth of the actuator 36, and, at the same time, the selection gear 31 will be moved to an active 0 position. The circuit for the energization of the electromagnetic devices 61 and 62 in the sixth ordinal position may be traced as follows: From the positive side of the DC. power supply 185, switch 186, conductor 187, conductor 188, numeral "5 switch 175, current directing diodes 24 4 and 245, in parallel, conductors 246 and 192, in parallel, windings of the Hi electromagnet 61 and the L electromagnet 62 in the sixth ordinal position, in parallel, diodes 247 and 248, in parallel, conductors 249 and 250, in parallel, thence through common conductor 249, the sixth position contact 25 1 of step switch 2th), movable contacts 199 and 199, conductor strip 281, conductor 202 to the negative side of D.C. power supply 185. Also the winding 2% of step switch 200 will be energized, thereby cocking the hook 210 for stepping the ratchet 211 to the next, or fifth, position, in the same manner as previously described.

Printing of the numeral 6 by the typewriter will resuit in the closing of the switch 176 of the control circuit. Closing of the switch 176 will complete circuits for the simultaneous operation of the Hi electromagnetic 'device 61 and the B electromagnetic device 64 in the fifth ordinal'position, the former device operating to release the selection bar 25 for forward movement and the extent of forward movement being controlled by the stop slide 91 operated by the B electromagnetic device. The circuit for energizing the electrornagnets 61 and 6 1 for entering the digit 6 in thefifth order accumulator dial 52 of the calculating machine may be traced as follows: Source of DC. supply 135, switch 186, conductor 1117, conductor 188, numeral 6. switch 176, in parallel, through diodes 254 and 255, conductors 246 and 191, windings of the electromagnetic devices 61 and 64-, respectively, in the fifth ordinal position, diodes 256 and 2537, and conductors 258 and 25 9, thence through conductor 258 to the fifth position contact 268, movable contacts 199 and 199', conductor strip 2111, conductor 26 2, to the power supply 185. Again the switch 131) will be closed by the aforementioned ribbon-raising mechanism of the typewriter, simultaneously with the closing of the switch 176, to again energize the winding 2&5 of the step switch 200. Thus the movable contacts will be rotated to the next, or fourth, position of the sensing circuit.

Assume that the value "7 has been typed by the typewriter for entering in the fourth ordinal position of the calculator. Thetyping of the numeral 7 by the typewriter Will operate circuits for energizing three of the electromagnetic devices in the fourth order of the calculator: The Hi, the A and the B electromagnets. The circuit for the foregoing can be traced as follows: From the source of supply 185, through the switch 186, conductor 187, conductor 188, to switch 177. From switch 177, three circuits run in parallel to a common conductor 266, as follows: (1) diode 264, conductor 246, the Hi electromagnetic device 61 in the fourth order of the selection apparatus, diode 265, conductor 266; (2) diode 268 of switch 177, conductor 2'18, the winding of the fourth order A electromagnet 63, diode 269, conductor 270; and (3) from the diode 271 of the switch 177, conductor 191, the winding of the fourth order B electromagnet 64, diode 272, conductor 273; all three of which unite in conductor 266', and thence through contact 267, movable contacts 199 and 199, conductor strip 201, conductor 2G2 to the source of supply 185. Again, as the typewriter types the numeral 7, the circuit for stepping the step switch 200 to the next, or third, position will be energized in the manner previously described; I

The printing of the numeral 8 in the typewriter and the consequent closing of the switch 173 will result in placing the digit 8 in the calculating machine by operation of the Hi and the A electromagnetic devices 6 1 and 63. Assuming that the entry would be made in the third ordinal position in the calculator, the circuit for energization of these electromagnetic devices may be traced as follows: Source of current supply 185, switch 186, conductor 187, conductor 188, numeral 8 switch 178; thence in parallel through diodes 277 and 278, conductors 246 and 218, the winding of the third order Hi electromagnet 61 and the winding of the third order A electromagnet 63, diodes 279 and 280, and conductors 281 and 282, to a common conductor 281, third position contact 283, movable contacts 1119 and 199' of the step switch 200, conductor strip 291, and conductor 262, to the power supply 185. The switch will again be closed simultaneously with the closing of the switch 178, thereby completing a circuit to the coil 265 of the step switch 21H Energization of the coil 205 will attract the armature 2119, therefore positioning the hook 210 in the next tooth of the ratchet 211. When the ribbon raising mechanism of the typewriter is lowered by the release of the numeral 8 key of the typewriter, the switch 181) will be opened to de-energize the coil 265. When the coil 285 is deenergized, it will release the armature 2119, which will return to its normal inactive position by spring action, not shown, thereby rotating the ratchet and the movable contacts 199 and 199' secured thereto to the next, or second, position.

Operation of the numeral 9 key in the typewriter and the consequent operation of the switch 179 in the control circuit will result in the energization of a single Hi electromagnet device 6 1 in the second ordinal position of the calculator. The energization of the electromagnet 61 will release the selection bar 25 for forward movement in the calculator. The bar 25 will be moved forwardly by its spring 82 until the perpendicular ear 92 engages the forward edge of the third notch 112 provided in the upper edge of the adjacent selection bar 26. Thus the selection gear 31 will be aligned with the nine teeth of the actuator 36, and upon rotation of the actuator 36 the selection gear 31 will be rotated nine increments to register the value of 9 in the accumulator dial 52. The circuit for energizing the Hi electromagnetic device 61 can be traced as follows: Power supply 185, main switch 186, conductor 187, conductor 188, numeral 9 switch 17$, conductor 246, the winding of the second ordinal Hiielectromagnet 61, diode 2'87, conductor 23%, conductor 288', second position contact 289 of the step switch 2%, rotatable contacts 199 and V 199, conducting strip 2111, conductor 211 2, and back to the power supply 185. Once again the winding 2195 of step switch 2% will be energized and de-energized in the manner previously described, whereby the contact 199 will be positioned in the first position of the step switch.

When the typewriter key 0 is operated, the type- Writer will print the character in the usual manner, but

no switch is provided in the control circuit thereof for operating the calculator. Therefore, no entry will be made into the calculator, but the raising action of the ribbon mechanism will close the Contact 180, thus operating the electromagnet 2 35 in such a manner as to position the movable contacts U9 and 1%9 of the step switch to the next rotatable position thereof.

Assume that the carriage of the typewriter has been tabulated to a left-hand position, whereby the step switch 200 has been stepped to its first contact position in which it will condition the value entry circuit for operation in the first ordinal position (that is, the extreme right-hand order), For this situation, any of the values could be used for purposes of illustration, and thevalue circuit would be identical with those outlined above. What is important in operation in this order is the return of the step switch 269 to its original, or highest order, position. Again the switch 18%} will simultaneously close when any switch 171 to 1719 is closed and the coil 285 of step switch 2% will be energized. Again the energization of the coil 2115 will attract the armature 2139, operating the hook 216 into engagement with the next tooth of the ratchet 211 Upon de-energization of the coil 265, the armature 269 will be spring-returned toils inactive position, whereby the ratchet will be rotated one step. Such rotation of the stepping member (including the ratchet 211 and arms 19?, 199) can be set to its original, or, in this case, to its tenth ordinal position, by conventional means, not shown, but generally understood: (1)

the contacts or poles of the step switch 200 can be arranged in a 360 circle with the first order contact 297 adjacent the tenth order contact 198; (2) the step switch 2% can be provided with two more movable contacts similar to the contacts 199 and 199 but diametrically opposite thereto with the poles thereof, equally spaced apart to inscribe an arc of 162, whereby when one of the movable contacts 199 is stepped 01f of the tenth ordinal pole the opposite movable contact is stepped on to the first ordinal pole. In either event, the first order contact 297 is connected to diodes 293 and 294 by means of conductors 2.95, 295' and 296, respectively.

It will be seen that by suitable operation of the tabulating facilities of the typewriter and the movement of the carriage and the subsequent and selective operation of the electromagnetic devices in the calculator, the values of digits 1 to 9 may be entered into the calculator at any required ordinal position therein. Also, the amounts entered into the calculator will be accumulated in the usual accumulating apparatus provided in the calculator and comprising the numeral wheels 52 in the various ordinal positions in the carriage. As above mentioned, the calculator is provided with a readout mechanism 165 through which the amounts recorded on the accumulator dials 52 may be read out and transmitted to a remote recording apparatus, such as a typewriter, to control the typewriter in such a manner that it will type the amounts represented on the numeral wheels 52 of the calculator.

Second embodiment A modification of the present invention is shown in FlGS. 3 and 4 and comprises a pair of selection gates similar to the selection bars described in the Patents Re. 13,841 issued to F. S. Baldwin and Re. 16,207 to E. E. Phinney of November 10, 1925.

The ordinally arranged plurality of pairs of selection members described in the above-mentioned patents of F. 8. Baldwin and E. E. Phinney are rockable in a varying degree for the purpose of laterally adjusting a primary and an auxiliary digitating pin wheel, or gear. The first pin wheel has four pins of different lengths radially positioned thereon, and the second pin wheel has five pins of the same length radially positioned thereon. When the pin wheels are laterally moved by the selection bars, as will hereinafter be described, and when they are rotated by mechanism described in the above-mentioned patents, they will drive an intermediate gear, which, in turn, is operatively engaged with a numeral wheel of the registration mechanism. If the first mentioned pin wheel is moved laterally a short distance, the longest pin thereof will be moved into operative engagement with the intermediate gear, so that a complete rotation of the wheel will move the intermediate gear one tooth; if the wheel is moved further, the next, or shorter, pin thereof also will be brought into operative engagement with the intermediate gear, so that a complete rotation of the wheel will rotate the intermediate gear two teeth; if the wheel is moved still a further lateral distance, a still shorter pin will be brought into operative engagement with the intermediate gear and a complete rotation of the wheel will turn the intermediate gear three teeth; and if the wheel is moved still further, the fourth, and shortest, pin will be brought into operative engagement with the intermediate gear and a complete rotation of the wheel will rotate the gear four teeth. When the second mentioned pin wheel is laterally moved upon its shaft in the opposite direction to that of the first pin wheel, i.e., the wheels are moved toward each other, all of the five pins radially positioned on this second mentioned wheel will be brought into operative engagement with the intermediate gear and a complete rotation of the wheel will turn the intermediate gear five teeth; and if the second mentioned wheel is laterally moved, as stated, and at the same time the first mentioned wheel is laterally moved to bring one, two, three or four of its pins into operative engagement with the intermediate gear, the intermediate gear will, upon a complete rotation of the first mentioned and the second mentioned pin wheels, be driven through increments of six, seven, eight or nine teeth. In this manner both pin wheels can be made to turn the intermediate gear from one to nine teeth. The wheels are retained in their normal inoperative spaced-apart position by a coil spring axially positioned between the two pin wheels, as is well-known in the art.

Conventionally, a plurality of ordinally arranged selection keys are operable to position the first mentioned and the second mentioned wheels. Located below each ordinal series of keys is a pair of rockable selection bars. The rockable members of each set has an end extension projecting upwardly and forked to extend into operative engagement with the above-mentioned wheels, so that upon actuation of a rockable bar or bars by the operation of one of the keys, the pin wheels will be laterally adjusted upon their shaft to an extent corresponding to the movement of the rockable bar or bars.

In order to rock each of the bars, or gates, the varying degree required for the purpose of differentially engaging the pin wheels with the intermediate gear, each of the keys has a cam surface provided on the lower extremity of the key stem. The cam surfaces are arranged at varying inclinations to engage the upwardly directed edge of the rockable bar and therefore actuate the bar a greater or lesser, distance according to the numeral key depressed. The keys which are numbered 1, 2, 3 and 4 each has a single cam surface which is of increasing inclination with relation to the plane of the bar, or bail, to actuate the rockable bars a varying degree in the proper direction to bring one, two, three or four of the pins of the first mentioned pin wheel into use. The key bearing the numeral 5 has a single cam oppositely disposed from the cams of the 1 to 4 numeral keys, which cam is arranged to actuate the other rockable bar toward its mate to bring the five pins of the second mentioned pin wheel into operative position; and the keys bearing the numerals 6, 7, 8 and 9 each has a double, or divided, cam thereon to actuate both of the rockable bars toward each other, one of the bars being moved to bring the five pins of the second mentioned wheel into position, and the other of the rockable bars being simultaneously moved to bring one, two, three or four pins of the first mentioned wheel into position.

By referring to FIGS. 3 and 4 of the drawings, it can be seen that my modification comprises a pair of rockable selection bars 305 and 366, constructed and arranged so that they can be actuated and positioned by four electromagnetic devices, schematically shown in FIG. 3. In the preferred embodiment shown, the selection bar 305 controls the four-pin pin-wheel of the above-mentioned patent for entering the values of 1, 2, 3 and 4 into the calculating machine. The other selection bar 3% controls the positioning of the five-pin pinwheel of the above-mentioned patent, which controls the entering of the value 5 into the calculating machine. The combination of the two gates 305 and 306, respectively, controls the entering of values of 6, 7, 8 and 9 into the calculating machine, as described above. The first selection bar 305 is rockably mounted at both ends on a rod 307 by ears 308 projecting at right angles to the selection bar. A yoke 309 projects upwardly and inwardly from the selection bar 305, which yoke cooperates with the first mentioned pin wheel in the patent described above. The second selection bar 3% is likewise rockably mounted at both ends upon a rod 310 by ears 311 projecting at right angles from the lower edge of the selection bar 306. Similarly, the second selection bar 306 has a yoke 312 projecting upwardly and inwardly from the bar in such a manner as to engage the second-mentioned pin wheel, or drive gear, of the above-mentioned patent.

The various positions of the selection gates 305 and 306, respectively, is controlled by an electrical system similar to that shown in FIG. 7. The first selection bar 305 is controlled in its various positions by means of electromagnetic devices 320, 321 and 322, which devices cooperate with a laterally projecting ear 323, formed at right angles on the selection gate 305, forwardly of the yoke 309 (see FIG. 4). A first notch 324 is cut in the upper edge of the ear 323, at the end of the ear farthest from the selection gate 305. This notch 324 is so positioned in the car 323 that it aligns with the first electromagnetic device 320. A second notch 326 is formed in the upper surface of the ear 323, which notch 326 is of greater length than the first notch 324 and is positioned inwardly therefrom. The second notch 326 is so positioned in the car 323 that it is aligned with the second electromagnetic device 321. A pin 327 is secured to the ear 323, which pin extends rearwardly therefrom. Rockably mounted on this pin 327 is an arm 328, which is so constructed and arranged as to partially block the first notch 324 and fully blocks the second notch 326. The rockable arm 328 is biased upwardly (clockwise in FIG. 3) by a spring 320 extending between a pin 330 riveted v to the ear 323, and another pin 331 riveted to the rockable arm 328. An S-shaped latch 332 is rockably mounted on the pin 327 rearwardly of the arm 328. One end of the S-shaped latch 332 is provided with a hook which cooperates with a square latch stud, or rod, 333 secured to the framework of the machine. The S-shaped latch 33?. provides a novel means for latching the first selection gate 305 in an inoperative position, the gate 305 being biased to an operative position by a spring 334 extending between the first gate305 and the second gate 306. The third electromagnetic device 322 operates the S-shaped latch, whereby rocking of this latch about its pivot 327 will release the hook portion thereof from i the latch stud 333.

The second selection gate 306 is controlled in its movement by means of a fourth electromagnetic device 337 which operates a second S-shaped latch 338. The second S-shaped latch 338 is pivotally mounted on a pin 339, which is secured to a right angle projecting ear 340 of the second selection gate 306. One end of this second S-shaped latch 338 is provided with a hook portion, which cooperates with a square latch stud, or rod, 341 secured to the framework of the machine in such a manner as to latch the second selection gate 306 in an inoperative posi- Assuming that a value of 1 is desired to be entered into the calculating machine of the above-described Baldwin or Phinney patents, which value entry is controlled from a remote control circuit by an electrical system similar to that shown in FIG. 7, the first and third electromagnetic devices 320 and 322, respectively, will be energized by an appropriate circuit similar to that shown in FIG. 7. Accordingly, the third electromagnetic device 322 Will release the latch 332, by rocking .it in a counterclockwise direction as viewed in FIG. 3. clockwise operation of the latch 332 will release the hook portion thereof from the stud 333, whereby the rockable bar 305 is moved (counterclockwise in FIG. 3) by the spring 334. Simultaneously, with the energization of the third electromagnetic device 322, the first electromagnet 320 is also energized. Energization of this electromagnet will position the armature thereof within the first notch 324 of the ear 323. As the selection'bar 305 swings in its counterclockwise direction about its pivot 307, the edge of the rockable arm 328, which lies within the area of the first notch 324, will abut against Counterthe armatureof the electromagnetic device 320. Thus, the rocking of this selection bar 305 is stopped at the end of one increment of movement, i.e., in a position such that the yoke 309 has moved the first mentioned drive gear, or pin wheel, of the above-mentioned patent a .suificient lateral distance whereby the longest pin thereof will. be brought into operation.

Entering of the value of 2 into the calculating machine of the above-described patent is obtained by simultaneous operation of the unlatching electromagnetic device 322, and the first and second electromagnetic . devices 320 and 321, respectively. The operation of the unlatching device 322 is effective to unlatch the selection bar 305. Simultaneously, the second electromagnetic device 321 is energized, whereby the armature thereof will engage the upper edge of the rockable arm 328. Downward movement of the armature of the second electromagnetic device 321 will rock the arm 328 (counterclockwise in FIG. 3) about its pivot 327 against the tension of the spring 329. Thus the forward edge of the arm 328 will be removed from partially blocking the area of the first-mentioned notch 324. Simultaneous operation of the first electromagnetic device 320 will position its armature within the first notch 324, whereby the right-hand edge of this notch 324 will abut the armature of the first electromagnetic device 320 (see FIG. 3). Thus the selection bar 305 will be blocked after two increments of movement about the pivot point 307, whereby the second, or next to the longest, pin of the first mentionedpin wheel in the above-described patents will be brought into operative position.

The value of 3 is obtained by releasing the latch 332 from its latch pin 333 in the manner described above. Also, simultaneously, the second electromagnetic device 321 is energized and the armature thereof moves downwardly into the second notch 326. Upon downward movement of this armature it will contact the top of the rockable arm 328 and rock the arm (counterclockwise in FIG. '3) about its pivot point 327. Furthermore, the armature will engage the right-hand edge of the second notch 326 as the selection member 305 is moved (counterclockwise in this figure) about its pivot 307 by the spring 334. It can be seen, therefore, that the armature of the second electromagnetic device 321 provides a block for the first selection member 305 after the member has moved three increments of movement. This movement will position the four-pin pin wheel of the above-mentioned patent in a position that the third, or next to the shortest, pin of this wheel will be moved into operative position. The valueiof 4 is entered by operation of the unlatching of the electromagnetic device 322 alone. The operation of this electromagnetic device will release the latch 332 and allow the first selection member 305- to rock its fullest extent, or four increments of movement. A stud 342 mounted on the framework of the machine is provided within the path of movement of the notched car 323. This stud 342 provides a stop for the rockable member 305, whereby the yoke 309 of this member moves the first mentioned pin wheel a suificient lateral distance to enable the shortest, or fourth, pin thereof to be moved into operative position.

Entering of the value of 5 into the register of the Baldwinpatent, mentioned earlier, is achieved .by the rocking of the second selection member 306. The operation of this member is achieved by energization of the fourth electromagnetic device 337. Operation of this device Will release thealigned latch 338 (to move clockwise as viewed in FIG. 3) about its pivot pin 339. This movement of the latch 338 will remove the hook portion from the latch pin 341. Thus the second selection mem- 320, 321, 322 and 327.

moves to the right, as viewed in FIG. 3, it will move the second-mentioned, or five-pin, pin-wheel of the Baldwin patent into position where the five pins thereof will engage the intermediate gear. The yoke and selection bar can move only one step to the right as the yoke 312 will abut the stop pin 342, in which position it properly positions the second mentioned pin wheel to engage the intermediate gear described in the Baldwin and Phinney patents but not shown herein.

Entering of the value of 6 into the above-mentioned calculating machine is accomplished by simultaneous energization of the first, third and fourth electromagnetic devices 320, 322, and 337, respectively. Energization of the unlatching electromagnetic device 322 will release the latch 332 of the first selection member 395. The member 395 is rocked about its pivot 307 by the spring 334 until the rockable arm 328 abuts the armature of the first electromagnetic device 320. Thus the movement of the selection member 305 will move the first-mentioned (four-pin) pin wheel of the Baldwin patent to a position where the longest pin thereof will engage the intermediate gear. The-simultaneous energization of the unlatching electromagnetic device 337 will unlatch the latch 338 of the second selection member 306. This selection member 306 will likewise be moved about its pivot 310 by the spring 334 until its movement is stopped by the stop pin 342 abutting the yoke 312. Thus the second-mentioned wheel of the Baldwin patent Will be moved into position whereby the five pins thereof will engage the intermediate gear of said patent. It therefore can be seen that rotation of the wheels, as conventionally described by Baldwin, will rotate the intermediate gear thereof six teeth, whereby the value of 6 V will be entered into the register of this patent.

Entering the value of 7 into the register of the Baldwin calculating machine is accomplished by simultaneously energizing all of the electromagnetic devices Operation of the unlatching electromagnetic device 322 will release the first selection bar 305 for movement, as previously described. En ergization of the second electromagnetic device 321 will position the armature thereof to engage the upper edge of the rockable arm 328, rocking this arm (counterclockwise in FIG. 3) to remove it from partially blocking the first notch 324 out in the upper edge of the arm 323. Energization of the first electromagnetic device 320 will position the armature thereof into the notch 324 where the rightmost edge of this notch (see FIG. 3) will engage the armature of this electromagnetic device 320, and thereby limit the movement of the selection bar 305 to two steps, or increments. Therefore, the yoke 309 will move the second longest pin of the first-mentioned pin wheel into operative position with the intermediate gear of the Baldwin calculating machine. Also, operation of the fourth (unlatching) electromagnetic device 337 will release the second selection bar 3% for movement by the spring 334. The second selection bar 306 will move its fullest extent where it is stopped by the stop pin 342. Thus the yoke 312 will move the second mentioned wheel or gear a distance sufiicient to place the five pins of this wheel into operative position with the intermediate gear of the Baldwin calculating machine, and the combined operation of the pin wheels will enter the value of 7 into the register of the Baldwin calculating machine.

Entering of the value of 8 is accomplished by simultaneous energization of the second, third, and fourth electromagnetic devices 321, 322, and 337, respectively. Energization of the unlatching electromagnetic device 337 will allow the second selection bar 306 to position the second mentioned pin wheel ofthe Baldwin calculating machine into operative position with the intermediate gear of said patent. Operation of the other unlatching electromagnetic device 322 will release the first selection bar 305 for movement, and the peration of the second electromagnetic device 321 will provide a stop for this bar. Downward movement of the annature of the second electromagnetic device 321 will rock the rockable arm 328 counterclockwise and also will enter the second notch 326 of the notched ear 323. Movement of the selection bar 305 will allow the rightmost edge of the notch 326 to abut the armature of the second electromagnetic device 321 (see FIG. 3), whereby the bar 305 will be stopped in such a position that the yoke 309 thereof will move the first-mentioned pin wheel a sufficient lateral distance to position the three pins of this pin wheel into operative engagement with the intermediate gear of the Baldwin calculating machine.

Entering of the value of 9 into the register of the above-mentioned Baldwin patent is accomplished by simultaneously energization of the two unlatching electromagnetic devices 337 and 322, respectively. Releasing of latch 332 will allow the selection member 305 to rock its fullest extent, wherein the leftmost edge of the notched ear 323 (see FIG. 3) will abut the stop pin 342. This movement of the selection member 305 will position the first-mentioned pin wheel to position the four pins thereof into operative engagement With the intermediate gear of the Baldwin calculating machine. Release of the latch 338 of the selection bar 306 will allow this member 306 to rock to its fullest extent where it will be stopped by the stop pin 342. This will position the second-mentioned, or five-pin, pin wheel into operative engagement with the intermediate gear of the Baldwin patent. Thus, operation of the pin wheels in the manner described in Re. 13,841 will rotate the intermediate gear thereof and enter the value of 9 into the register of this patent.

All of the invention is herein illustrated and described as being a selection means suitable for use in connection with a calculating apparatus. It will be readily recognized, however, that the selection apparatus involved is not limited to such, and could be readily used, not only for controlling the operation of selection bars in a calculator, but is suitable for use as controlling means of other movable elements wherein electromagnetic devices serve as stops for the movable members required to be controlled. While I have shown but two embodiments of my invention, it is to be understood that the same is illustrative of the invention and that the invention is capable of modification and changes without departing from the spirit thereof or the scope of the following appended claims.

What I claim is:

l. A selection apparatus comprising ordinally arranged and differentially adjustable pairs of selection members, abutments on said members, means biasing each of said selection members to an exfleme operative position, a means for latching each of said selection members in an inoperable position, a fixed stop for said members controlling the maximum adjustment thereof, an electromagnetic latch releasing means for each of said latching means operative to release the respective one of said latching means and thereby selectively release the respective selection member, a pair of electromagnetic stop means for each pair of selection members operable to engage the respective abutments on said members and thereby selectively control the extent of adjustment of said selection members, means operated by the simultaneous operation of both of said electromagnetic stop means for changing the abutment to be engaged thereby, and means to selectively operate either one or both of sad electromagnetic stop means simultaneously with the operation of one or both of the electromagnetic latch releasing means.

2. An ordinally arranged selection apparatus comprising a plurality of ordinally arranged and differentially adjustable pairs of selection bars, means biasing each of said selection bars to an extreme operative position, a means for latching each of said selection bars in an means and thereby selectively releasing one or the other or both of said coordinal selection bars, a pair of electromagnetic stop means in each order operable selectively to severally control two intermediate differential adjustments of said adjustable selection bars and operable simultaneously to control a third diiferential adjustment thereof, a fixed stop means for each said selection bars controlling the maximum adjustment of said bar, and means to selectively operate the pair of electromagnetic stop means simultaneously with the operation of said electromagnetic latch releasing means.

3, An ordinal selection apparatus comprising in each order a pair of differentially adjustable selection bars, means for moving each of said selection bars to an extreme operative position, a means for latching each of the said selection bars in an inoperable position, a first electromagnetic means operable to unlatch one of the said selection bars, asecond electromagnetic means operable to unlatch the other said selection bar, a third electromagnetic means operable to control a first intermediate differential movement of the said selection bars, a fourth electromagnetic means operable to control a second intermediate differential movement of the said selection bars, the said third and the said fourth electromagnetic means being operable simultaneously to jointly control a third intermediate difierential movement of said selection bars.

4. A selection apparatus as defined in claim 3, wherein the said selection bars are longitudinally adjustable, said latching means is operable to latch said selection bars against longitudinal movement, the said electromagnetic unlatching means are operable to unlatch the said latch means to thereby allow said adjustable selection bars longitudinal movement, and the said third and fourth electromagnetic means are operable to differentially interrupt the longitudinal movement of said adjustable selection bars.

5. A selection apparatus as defined in claim 3, wherein the said selection bars are rockably adjustable, said latch means is operable to latch said adjustable selec tion bars in an inoperable position, the said electromagnetic unlatching means are operable to unlatch said latching means to thereby allow rocking of said selection bars, and the said third and fourth electromagnetic means are operable to differentially interrupt the rocking of the said rockable selection bars in one of the three intermediate differential positions.

6. In a calculating machine having an ordinally arranged selection apparatus, comprising in combination in each order a pair of longitudinally adjustable selection bars for entering values into said calculating machine, means to longitudinally move said selection bars to an extreme operative position, a latch member associated with each of said adjustable bars for latching said bars in an inoperable position, a group of openings in the edge portion of each of the said selection bars, a stop means formed on one of the said selection bars of each pair and extending into one of the openings in the other selection bar of the pair, a rockable member pivotally connected to each of the said adjustable selection bars, said rockable members fully blocking one of the said openings and partly blocking the other of the said openings,a first group of ordinally arranged electromagnetic means selectively operable to release one of each pair of the said latch members, a second group of ordinally arranged electromagnetic means selectively operable to release the other one of each pair of the said latch member, a means for stopping the extreme movement of either of the operated selection bars, a third group of ordinally arranged electromagnetic means J22 operable simultaneously with either the coordinal first or second electromagnetic means, an intermediate stop member in each order operated by the coordinal third electromagnetic means and which engages and rocks the said rockable member which fully blocks the one of said opening out of its blocking position and thereupon will engage the edge of said opening, a fourth group of ordinally arranged electromagnetic means operable simultaneously with either the coordinal first or second electromagnetic means, a second stop member in each order operated by the coordinal fourth electromagnetic means and which enters the other said opening and thereupon will engage the rockable member or the edge of the other said opening in said selection bars to provide other intermediate stops for said longitudinally adjustable selection bars, said third and said fourth electromagnetic means being simultaneously operable selectively with each other as Well as with either the said first or the said second electromagnetic means, and a remotely controlled electrical system for selectively operating said electromagnetic means.

7. In a calculating machine having an ordinally arranged selection mechanism, comprising in combination in each order a pair of differentially rockable selection gates operable to control the entry of values into said calculating machine, means to move said rockable selection gates to an extreme operative position, latch means to normally hold each of said rockable selection gates in an inoperative position, an arm on one of the said selection I gates of said pair and having a pair of openings therein, a rockable member pivotally connected to said arm, the said rockablemember partly blocking one of the openings in said arm and fully blockingthe other opening of said pair of openings, a first electromagnetic device selectively operable to unlatch one of said latch means, a second electromagnetic device selectively operable to unlatch the other of said latch means and simultaneously operable selectively with said first electromagnetic devices to unlatch both of said rockable gates, stop means to stop the extreme rocking of said selection gates, a third electromagnetic device operatively aligned with and adapted to project into said partly blocked opening and operable simultaneously with the said second unlatching electromagnetic device, a fourth electromagnetic device operatively aligned with and adapted to project into said fully blocked opening and operable simultaneously with the said second unlatching electromagnetic device and with said third electromagnetic device, and a remotely controlled electrical system selectively operable for selectively energizing the said electromagnetic devices.

8. A selection mechanism comprising a plurality of separately operable selection bars arranged in ordinal pairs and in spaced parallel relation, means tomove said selection bars in an operative direction, a group of rectangular notches of difierent length formed in the edge portion of said selection bars, the notches in each selection bar being in matched relationship with the notches in the other said selection bars, an ear formedon one of the selection bars of each pair and adapted to enter one of said rectangular notches in the other bar of the said pair of selection bars, a plurality of latch fingers pivotally supportedon each of the said selection bars and operable to latch said bars in an inoperable "0 position, electromagnetic means operable to release said latch fingers, means for stopping the extreme movement of said means and the second mentioned electromagnetic means to selectively control the movement of said selection bars.

9. In a calculating machine having an ordinally arranged selection mechanism comprising movable pairs of ordinal selection bars arranged in parallel spaced relation and operable for entering values in said calculating machine, one of said selection bars of the pair being operable for entering values of and above a predetermined value and the other selection bar being operable for entering values below the predetermined value, a latching member pivotally connected to each of the said selection bars for latching said bars in position, means biasing said selection bars to an operative position, and a first group of ordinal pairs of electromagnetic devices each operable selectively to release respective latching members of the said selection bars, the combination comprising a plurality of notches formed in the upper edge of the said selection bars at spaced intervals and of ditterent length dimensions, the notches in one of said bars being in aligned relation with the notches in the other of said bars, an ear perpendicularly formed on one of said paired selection bars and extending into blocking relationship with one of the said notches of the other said paired selection bars, a rockable member pivotally supported on each of said selection bars, said rockable member having a hump and a finger formed thereon with said hump being in blocking relation with one of the notches in said selection bar and the said finger being in partially blocking relation with another of the notches in said bar, a stopping ear protruding from said selection bars for stopping the extreme movement of said bars, a second group of ordinal pairs of electromagnetic devices operable to control intermediate movement of said selection bars, a pair of stop slides each controlled by one of said second pair of electromagnetic devices operable to move into blocking engagement with the said notches of said selection bars, restore means for restoring said selection bars and said electromagnetic devices, and means to selectively energize said first and said second pair of electromagnetic devices.

10. In a calculating machine having an ordinally arranged selection mechanism comprising movable pairs of ordinal selection bars arranged in parallel spaced relation and operable for entering values in said calculating machine, one of the selection bars of the said pair being operable for entering values of and above a predetermined value and the other selection bar being operable for entering values below the predetermined value, a latching member pivotally connected to each of the said selection bars for latching said bars in an 0 position, means biasing said selection bars to an operative position, and a first group of ordinal pairs of electromagnetic devices each operable to release respective latching members of the said selection bars, the combination comprising a series of notches formed in the upper edge portions of the said selection bars at spaced intervals and of different length dimensions, the said notches in each of said selection bar being equal to and corresponding with said notches in the other said selection bar of the pair, an ear formed on one of the said selection bars of each pair and extending into blocking relationship with one of the said notches of the other selection bar of said pair of selection bars, a rockable arm pivotally supported on each of the said selection bars, said rockable arm having a hump and a finger associated therewith, With the hump being in blocking relation with one of the said notches of said selection bars and the finger being in partial blocking relation With another of the said notches in the same said bar, a stopping ear protruding from said selection bars for stopping the extreme movement of said bars, a second group of ordinal pairs of electromagnetic devices operable to control intermediate movement of said selection bars, a pair of normally inactive blocking slides each controlled by one of the said second pair of electromagnetic devices and operable to extend into the said notches and thereby into the path of movement of said selection bars to control the movement of said bars to an intermediate differential position for entering predetermined values in said selection mechanism by operation of one of the said first pair of electromagnetic devices and a selected one of said second pair of electromagnetic devices, a restore solenoid operable to restore said selection bars to their latched 0 position and to restore said blocking slides to their normal inactive position, said first pair and said second pair of electromagnetic devices being simultaneously energizable to selectively control the movement of said selection bars.

11. An ordinally arranged selection apparatus comprising ordinally arranged pairs of difierentially adjustable selection members, one of the members of said ordinal pair being movable to control values of one magnitude and the other member being movable to control values of a second magnitude, means for moving each of said selection members to an extreme operative position, a means for latching each of the ordinal pair of said selection members in a 0 position, a first electromagnetic means operable to unlatch the one of the said selection members for controlling values of the first magnitude, a second electromagnetic means operable to unlatch the other said selection members for controlling values of the second magnitude, a third electromagnetic means selectively operable to interrupt the movement of said selection members to an increment of one value, a fourth electromagnetic means selectively operable to interrupt the movement of said selection members to an increment of another value, the said third and the said fourth electromagnetic means being operable simultaneously to interrupt the movement of said pair of selection members to an increment of a third value, and stop means for limiting movement of said members to their maximum operative position.

12. A selection apparatus comprising a plurality of differentially adjustable pairs of selection bars, one of said bars adjusting to values of 1 to 5 and the other to values of 6 to 9, means biasing each of said selection bars to an extreme value position, a means for latching each of said selection bars in an inoperable position, an electromagnetic latch releasing means for each of said latching means operative to release the respective one of said latching means and thereby selectively release the respective selection bar, a fixed stop for said members controlling the adjustment thereof to 5 and an inefiective space beyond 9 respectively, a pair of electromagnetically operated stop means for each pair of selection bars, abutments on said selection bars adapted to be engaged by one of said stop means after movement of two increments, a second abutment on said selection bars adapted to be engaged after movement of three increments, a movable stop member on said bars normally adapted to be engaged by one of the stop means after movement of a single increment and movable to an inoperative position by the other of said stop means, a stop member carried by one of said bars adapted to engage an abutment on the other bar after a movement of four increments, and means to selectively operate the electromagnetic means simultaneously with the operation of an electromagnetic latch releasing means.

13. A selection apparatus comprising a plurality of difierentially adjustable pairs of selection members, one of said members being adjustable to values of 1 to 4 and the other to a value of 5, means biasing each of said selection members to an extreme operative position, a fixed stop for limiting adjustment thereof to their maximum value position, a means for latching each of said selection members in an inoperable position, an electromagnetic latch releasing means for each of said latching means operative to release the respective one of said latching means and thereby selectively release the respective selection member, a pair of electromagnetically operated stop means for each pair of selection members, an abutment on said one selection member adapted to be engaged by one of the stop means after a movement of two increments, another abutment on said one selection member adapted to be engaged by the other stop means 5 after a movement of three increments, a movable stop member on said one member normally adapted to be engaged by said one stop means and movable to an inoperative position by the other stop means, and means to selectively operate the stop means and the latch re- 10 leasing means simultaneously.

References Cited in the file of this patent UNITED STATES PATENTS Chase Sept. 20, 1932 Fishack et a1. Aug. 18, 1942 Gang Apr. 28, 1953 Ellerbeck Aug. 9, 1955 Drake Apr. 10, 1956 Davis Oct. 30,1956

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