US2298202A

US2298202A - Listing calculator

Info

Publication number: US2298202A
Authority: US
Publication date: 1942-10-06
Anticipated expiration: 1959-10-06

Description

Oct. 6, 1942. P. CROSMAN 2,293,202

LISTING CALCULATOR Filed 00). 24, 1939 6 Sheets-Sheet '1 INVENTOR Loame 'P. Caosmm,

BY 6C1] CAmr/bm 76 0 1 ATTORNEY Oct. 6, 1942. p CROSMAN 2,298,202

LISTING CALCULATOR Filed Oct. 24, 1939 6 Sheets-Sheet 2 INVENTOR LORIHG P Caosman,

61 (1). Cl/Macada- ATTORNEY Oct. 6, 1942. L. P. CROSMAN LISTING CALCULATOR Filed Oct. 24, 1939 6 Sheets-Sheet 5 INVENTOR Loama P Caosman,

BY L 60. C/imcrmom rdm ATTORNEY Oct. 6, 1942. L. P. CROSMAN 2,298,202

LISTING CALCULATOR Filed Oct. 24, 1939 6 Sheets-Sheet 4 R I Loxzme, P Czoaman 3% 5 w .Cl/hflmom vm Oct. 6, 1942.

L. P. CROSMAN LISTING- CALCULATOR Filed Oct. 24, 1959 6 Sheets-Sheet 5 3mm Loews P Caosmnn,

661/. Ctmhmom Viz 1 Oct. 6, 1942. 1.. P. cRosMAN LISTING CALCULATQR Fild OCL 24, 1939 6 Sheets-Sheet 6 l\-\& F 0 Lemma P. CRcsMAM @760. mm m Patented Oct. 6, 1942 UNHTED STATES LISTING CALCULATOR Application October 24 15 Claims.

The invention relates to listing calculators, such for instance as the well known Monroe lister, an object of the invention being to provide improved means to so reverse the functioning of the opposite sign key devices that the plus bar may be used in entering or registering both credit and debit items and the minus bar may be used in registering corrections of both credit and debit items. Another object is to provide improved means embodying carriage-controlled means for effecting this reversal. Another object is to provide improved means embodying carriage-controlled means cooperable with means for carrying out a predetermined sequence or program series of operations for effecting this reversal. Another object is to render depression of the plus bar or the minus bar ineffective to initiate a succeeding machine cycle after the depression of either to initiate a machine cycle until the machine has performed its proper functions and is ready for the performance of another calculation. Other objects and advantages will appear hereinafter.

The invention consists in the novel construction and combinations of parts as hereinafter set forth in the claims.

In the accompanying drawings,

Figure 1 is a plan view of the machine.

Figure 2 is a left side elevation of the machine showing that portion of the reversible plus, minus bar mechanism located at that side of the machine, the parts being in plus position, namely in the positions assumed preliminary to normal operation of the machine, the latch for the feeler lever being shown as engaged therewith.

Figure 3 is a right side elevation of the machine showing that portion of the reversible plus, minus bar mechanism located at that of the machine, the parts being in the positions assumed preliminary to normal operation of the machine with exception of the switch members and the lever having spring connection therewith, which are shown in neutral pos. "on.

Figure 3a is a detail side view of the switch member in rear of that shown in Figure 3, parts being shown as broken away.

Figure 3b is a detail edge view of the switch members and the lever having spring connection therewith, parts being broken away.

Figure 4 is a detail side view of the secondary portions of the normal and reverse operation key devices.

Figure 5 is a view similar to Figure 2, the parts being in the positions assumed at the end of the first half revolution of the actuating crank Serial No. 301,053

the printing line.

in case the lug of the feeler lever strikes upon the periphery of the related disk, the latch being shown as disengaged from the feeler lever.

Figure 6 is a combined View of the reversible plus, minus bar mechanism shown in Figures 2 and 3, the parts being in the positions assumed at the end of the first half revolution of the actuating crank in case the feeler lever lug enters the notch of the related disk, the switch members being shown in minus position, namely in the position assumed preliminary to reverse operation of the machine.

Figure 7 is a detail view of certain parts shown in Figure 6, the switch members being shown in plus position, namely in the positions assumed preliminary to normal operation of the machine.

Figure 8 is a detail rear elevation of the machine, corresponding to Figure 2 of the patent to Crosman, No. 1,946,572, showing the line spacing lever and the lever with which it contacts to cause the platen of the record carriage to be given a line spacing movement.

In these drawings, the invention is shown applied to a machine designed to be equipped with carriage-controlled program mechanism for carrying out a predetermined sequence of operations, such for instance as disclosed in the Crosman Patent No. 1,946,572, as modified the disclosure of the Crosman Patent No. 2,147,692, the

i Crosman Patent No. 1,932,013 being referred to for certain features of the mechanism.

eneral operation Amounts set up on the digit keys 245 (Fig. 1), are accumulated in one or more accumulators 4'13 (Fig. 3), either additively by engagement of an accumulator during the upward stroke or subtractively by engagement thereof during the downward stroke of segmental racks forming part of actuator levers (not shown). The extent of movement of each segmental rack is limited by engagement of a toothed member or stop bar, carried by the related actuator lever, with the lower end of a depressed key 2E5, whereby such movement will correspond with the value of the key depressed. Type bars are also carried by said actuator levers and are raised thereby to bring the appropriate type to Before the return of the adjusted actuator levers, and their segmental racks and type bars, spring type hammers are released by suitable triggers to print the item on a record sheet passing around the platen of the shiftable carriage.

Plus, minus and non-add setting The accumulators 413 are set to give the desired registration by means of two cam plates 4I9, 42I (Fig. 3), pivoted to the stationary framing at 420 and 422 respectively, these cam plates cooperating with cams carried by the shafts 403 of the accumulators. From the position illustrated in Fig. 3, these cam plates are rocked towards each other by means of a rocker device 325, connected with the cam plates by the members 322, 32I and operated by cam arms 320, 3I5, fixed upon the rock shaft 30 I. Rocker device 325 as set for normal operation provides for movement of said cam plates 4I9, 42I towards each other, as soon as the machine is put into operation and prior to movement of the actuator levers. At the beginning of the return movement of rock shaft 30L rocker device 325 will be operated in a reverse direction to return the cam plates to the position illustrated in Fig. 3, before the return movement of the actuator levers is begun.

Each of the cam plates M9, 42!, is provided with two

cam faces

452, 454, which are transversely offset from each other. In the position illustrated in Figure 3, the cam faces 452 of said plates are located opposite the shafts 403; whereas, upon movement of said plates by rocker 325, the cam faces 454 will be brought opposite the shafts 403.

Each shaft 403 is provided with a cam 453 lying in. the plane of the related cam face 452, and a cam 455 lying in the plane of the related cam face 454. The shafts 403 may be held in either of three rotated positions, whereby the high points of said

cams

453 or 455 or the low points thereof may be brought opposite the cam faces of the plates 4I9, 42I. The shafts 403 are urged by spring means away from the segmental racks of the actuator levers, suitable guides in the stationary framing being engaged by said shafts. Thus the shafts 403 will hold the accumulators 413 out of mesh with said segmental racks unless a

cam face

452 or 454 is engaged by a

cam

453 or 455, in which case the accumulator will be moved into engagement with the related segmental rack.

To set the accumulators for addition, the cams 453' are rotated to active position engaging the cam faces 452 of said plates, so that the accumulators will stand in engagement with the segmental racks of said actuator levers when the machine is at rest; will be allowed to drop out of mesh with said racks by action of rocker 325 as soon as the machine is put into operation, and will be reengaged with said racks at the beginning of the return stroke thereof. It may be noted that the upper accumulator is set for addition in Figure 3, the lower accumulator being set for non-add. To set the accumulators for subtraction, the cams 455 are rotated into the paths of movement of the cam faces 454 of said plates. When the machine is started, the rocking of the plates 4I9, 42I will bring the cam faces 454 into contact with the cams 455 and will move the accumulator gears into mesh with the segmental racks of the actuator levers prior to the initial movement of said racks. Before the return movement of said racks has started, the plates 4I9, 42! will again be rocked, moving the cam faces 454 away from the cams 455 and allowing the accumulator gears to move out of mesh with said racks.

All of the above noted operations relate to normal registration, which is effected upon depression of a normal operation key or plus bar, which depression releases a latch lever I41 from engagement with a spring-urged clutch control lever I50. The effect of the additive or subtractive setting of the

cams

453, 455 may be reversed upon depression of a reverse operation key or minus bar, acting to trip the latch lever I47 and adjust the rocker device 325 as set forth in said Crosman patents and in the Gardner Patent No. 1,867,002. This reversing adjustment of the rocker device 325 provides that the plates 4i 9, 42I shall remain in the position illustrated in Figure 3 until the completion of the downward stroke of the segmental rack of the actuator lever, whereupon said plates H9, 42I will be rocked towards each other and held in this adjusted position during the return stroke of said rack.

Reversible plus, minus bar mechanism The plus bar and the minus bar form part of normal operation and reverse operation key devices having each primary and secondary portions. Supplemental carriage-controlled means to be described include means for rendering operative the secondary portion of either key device by the primary portion of the normal operation key device and for simultaneously rendering operative the secondary portion of the other key device by the primary portion of the reverse operation key device, whereby the registration of items of either of opposite signs may be effected upon depression of said plus bar and corrections of registrations of items of either of opposite signs may be effected upon depression of said minus bar.

' The normal operation or plus key lever I, having plus bar I, is fulcrumed at 2, and connected by link 3 with a lever 4, fulcrumed at one end thereof at 5, and at its other end having pivoted thereto at 5, a pendant switch member I, these parts constituting the primary portion of the normal operation key device. The secondary portion of the normal operation key device comprises a lever 8, fulcrumed at one end thereof at 5, and at its opposite end having lug 8 adapted to be contacted by switch member 1, said lever 8 having link connection II with a lever I2, fulcrumed at one end thereof at 2, and at its free end being adapted to rock latch lever I41 from engagement with the spring-urged clutch control lever I50.

The reverse operation or minus key lever I3, having minus bar I3, is fulcrumed at 5, and the free end of its work arm has pivoted thereto at 5, a pendant switch member I4, these parts constituting the primary portion of said key device; the secondary portion of which comprises a bell crank lever I5, the free end of one arm of which has alug I5, adapted to be contacted by switch member I4, the free end of the other arm of lever I5 having a roller I5" adapted to rock plate I40 to thereby release latch lever I47 from engagement with the clutch control lever I50. This rocking of plate or lever I40 also through lever M and link 42 adjusts the rocker device 325 to reverse the effect of the additive or subtractive settings of the

cams

453, 455, as aforesaid.

Switch member I is provided with a lug I adapted to be neutrally, that is to say, centrally and inoperatively positioned with respect to the spaced lugs 8' and I5 of the levers 8 and I5 following completion of a machine cycle as will be explained, and in the adjustment of said switch member to one or the other side by said supplemental carriage-controlled means, said lug I will be operatively positioned with respect to the lug 8' of lever 8 for normal or plus operation upon depression of the plus bar, or will be operatively positioned with respect to the lug 15' of lever I for reverse or minus operation also upon depression of said plus bar.

Switch member I4 is provided with two spaced ledges l4 and M" and in the adjustment of said member to one or the other side by said supplemental carriage-controlled means (said adjustment taking place simultaneously with the similar adjustment of switch member 7) the ledge M will be operatively positioned with respect to the lug l5 of lever for reverse or minus operation of the machine upon depression of the minus bar, or the ledge 54" will be cperatively positioned with respect to the lug ii of lever 8 for normal or plus operation, also upon depression of the minus bar. The spaced ledges i l and M" are adapted to be neutrally, that is to say, inoperatively positioned with respect to the spaced lugs 8 and E5 of levers 8 and i5 following completion of a machine cycle as will be explained.

Thus, for the plus key device there is provided a switch member 7 and a cooperating member 8, and for the minus key device there is provided a switch member is and a cooperating member [5, and said supplemental carriage-controlled means to be now described is adapted to simultaneously adjust both switch members to operatively position the same with respect to the cooperating members of the opposite sign key device.

Loosely supported upon shaft IS mounted on auxiliary frame plate I! on the left hand side of the machine is a series of ten disks :8, each of which has a peripheral notch E9, the functioning of the mechanism herein described having reference to only one of these disks, the other disks and related mechanism being for the purpose of controlling various other functions of (Fig. 2)

the machine not described herein. These disks are rivet-ed together and by pin and slot connections are made fast to a gear 253 which meshes with a gear 2i fastened to the spring drum 8 which carries the carriage shifting tape 9' for shifting the carriage Also supported on frame plate ii is a shaft 22, upon which is loosely mounted a series of ten feeler levers 23, the members of which series fit between the teeth of and are laterally guided by comb and at their upper ends have each two spaced

lugs

23 and 23". The lugs of ieeler levers 23 are so zoned that they may each enter a peripheral notch [5] of a related disk 58 (Fig. 2), or, if the notch is not located diametrically opposite said lug, it may strike upon the perip ery of disk (Fig. 5). These feeler l vers 23 have each a lower forward arm 25, which by the tension of its spring 26 is held in contact with the undersi e of the bail arm of a lever ill common to the series of feeler levers. The bail levers 27 through arm 28 theree of, link 23, bell crank lever 33 and link 3|, is connected to crank arm 55, fast upon a shaft 5 3'. The actuation of shaft 55 and crank arm 58' is described in the rosman Patent No. 1,946,572. Also mounted on shaft 22 is series of ten levers 32, the members of which series engage between the teeth of and are laterally guided by comb 33 and carry at their upper ends fulcrumed thereto at each a toggle hook lever the upper arm of which has a slot 35, with which a pin 3% of a related feeler lever engages.

Counter-clockwise movement of crank arm 58', through link 35, bell crank lever 30 and link 29,

' means has located a disk of ten latch levers 44 only one will rock bail lever 28 and lift the bail arm thereof. As a result, the feeler levers 23, under infiuence of their springs 26, will be rocked counterclockwise towards the program disks in. Pivoted to the lower arm of a related lever 32 is a link 31, having pin and slot connection 38 with a bell crank lever 39, fulcrumed at 53, and having a rearward arm 4| overlying the bail arm of lever 27. Thus upon upward movement of the bail arm of lever 21 during the first half revolution of crank arm 58, bell crank lever 35} will be actuated to move said lever 32 clockwise to its mid position; and if the supplemental carriage controlled means has located a disk IS with its peripheral notch is diametrically opposite the lug 23 of said feeler lever, said lug will enter the notch and the feeler lever will be moved further counterclockwise during the first half revolution of crank arm 53'. At the same time the related toggle hook lever 34% by the camming action of pin 35 of said feeler lever in slot 35 of lever 34 will have the hooked end thereof brought under the bail arm of lever 27 which is at this time in raised position. During the second half revolution of crank arm es, the toggle hook lever 34, the hooked end of which is now located beneath the bail arm of lever 22, will be moved downwardly by said bail arm to thereby move said lever 32 further clockwise for an augmented movement wtuch is just twice that without such augmentation and may be termed a full movement as contrasted to its movement to mid position which may be termed a modified or half way movement.

To the lower arm of said lever 32 is fastened one end of a Bowden cable 42, which extends around the front of the machine and at its opposite end is connected to the main arm of a control lever 51, the tail arm of which has connected thereto a spring 52 which urges said control lever clockwise (Fig. 3) and exerts tension upon said Bowden cable which latter limits the movement of said control lever.

If however the supplemental carriage controlled 58 with its peripheral notch I9 otherwise than diametrically opposite the lug 23' of said feeler lever, during the first half revolution of crank arm 58, the feeler levers under influence of their springs 25 being rocked counterclockwise towards the program disks l8 as aforesaid, said lug will strike upon the periphery of said disk (Fig. 5), and during the second half revolution of crank arm 5&3 said lever 32 will be moved counterclockwise and returned from its mid position to its first position, due to the aforesaid tension upon said Bowden cable.

Within a recess in the left side of the keyboard provided with a cover plate 33 (Fig. l), is a series of which is utilized in the present case but each of which has at its rear end a hook engageable between the spaced lugs 23 and 23 of a related fceler lever to disable said feeler lever. Each latch lever is provided with a toggle spring to hold the adjustment.

The switch members i and it have individual springs 43 and 46' connecting the lower ends thereof with the upper end of one arm of a lever 41, loosely fulcrumed at 48 between the right hand side frame of the machine and latch lever I41, the latter also being fulcrumed at The lever 47 has the free end of the lower arm thereof provided with a lug 47 adapted to engage a notch 49' of a latch member fit,

pivoted at 56- upon the free end of one arm of said control lever also fulcrumed at 48.

The latch member 49 has pin and slot connection 53 with the upper end of a lever 53, fulcrumed at its lower end at 54 upon the line spacing lever 55. A light spring 56 connected to lever 53 tends to actuate lever 55 pivotally about its fulcrum 55 and to maintain its free end in contact with a lever 57, which is part of the back plate assembly. Operation of lever 55 causes the platen of the record carriage to be given a line spacing movement, said spring 55 urging said lever 53 clockwise about its fulcrum 54, thus tending to rock latch member 49 counterclockwise about its pivot 55 and maintaining the notch of said latch member engaged with the lug 41' of said lever 41.

The lever 41 has three positions, namely neutral, normal and reverse, being shown in Fig. 3- in its neutral position, whereas the control lever 5| is shown in its normal position.

Pull being exerted upon Bowden cable 42 by actuation of its related lever 32 as described to its mid position, the control lever 5| will be moved from its normal .to its neutral position, wherein the latch member 49 will have the notch 49 thereof engaged with the lug 41 of lever 41, and such pull continuing as an incident of the full movement mentioned of lever 32, the control lever 5| will be moved further counterclockwise and assume its reverse position, carrying therewith the lever 41 and said switch memhers I and I4, the former to its reverse position and the latter to its normal position (Fig. 6),

wherein lug I of member I will be operatively positioned with respect to the lug I5 of lever I5 forming part of the secondary portion of the reverse operation or minus key device, and wherein the ledge I4" of member I4 will be operatively positioned with respect to the lug 8 of lever B forming part of the secondary portion of the normal operation or plus key device, in consequence of which subtractive operation of the machine will result upon depression of the plus bar and additive operation will result upon depression of the minus bar.

Otherwise, as an incident of the modified or half-way movement mentioned of lever 32, the control lever 5| after being moved to its neutral position during the first half revolution of crank arm 58' to engage the notch of latch member 49, with the lug 41' of lever 41 will, during the second half revolution of crank arm 58', be returned to its normal position, carrying therewith the lever 41 and the switch members I and I4, the

former to normal position and the latter to reverse position (Fig. 7), wherein the lug I of member I will be operatively positioned with respect to the lug 8' of lever 8 forming part of the secondary portion of the normal operation or plus key device, and the ledge I4 of member I4 will be operatively positioned with respect to the lug I5 of lever I5 forming part of the secondary portion of the reverse operation or minus key device, in consequence of which additive operation of the machine will result upon depression of the plus bar and subtractive operation will result upon depression of the minus bar.

The control lever 5| remains in either normal or in reverse position as the case may be until another cycle of the crank arm 58 is initiated.

The crank arm 58' being revolved each time the carriage 5 is shifted to a new column in accord with the program, lever 32 will be brought to neutral or mid position at the half cycle of the crank arm and from mid position will move forward to normal position if the related disk I8 is then so located that its peripheral notch I9 is not diametrically opposite the lug 23' of the related feeler lever, but will move rearward to reverse position if said notch I9 is located diametrically opposite said lug.

Each time the latch lever I41 is tripped, to release the spring urged clutch control lever I50, this tripping taking place upon depression of the plus bar or the minus bar as the case may be, a roller 58 of said clutch control lever is adapted to close the contacts of an electric switch to start the motor (not shown) and the machine cycle.

The stud 59 of clutch control lever I55 upon which roller 58 is mounted is adapted to engage a hump 53" of lever 53 when the line spacing lever 55 is normally located. Thus when a machine cycle is initiated the stud 59 moves lever 53 and latch member 49 sufficiently to disengage the notch of latch member 59 from lug I? of lever 51, thereby allowing springs 33 and to return lever 41 and switch members I and I4 to'neutral position as soon as pressure is released from the plus bar or the minus bar. In line spacing the paper, lever being actuated as aforesaid, lever 53 will be raised bodily and the hump 53 thereof will be raised out of the path of movement of stud 55 of spring urged clutch control lever I50 so that when lever I50 is thrown following tripping of latch lever I51, the stud 59 will not move lever 53 and latch member 4-9 and there will be no disengagement of the notch of latch member 49 from lug d? of lever 41. This arrangement provides that if the platen of the record carriage is given a line spacing movement, so that a second operation may be performed in the same column, the normal or the reverse setting of the switch members I and I4 will not be disturbed. The lever 51 is fulcrumed at 51 to the framing of the machine, and in line spacing operations, upon actuation of line spacing lever 55, lever 51 is rocked clockwise (Fig. 8), thereby rocking bell crank 205 counterclockwise about its pivot 255, and rocking lever 208-2), fulcrumed at 209, clockwise, one end portion 2l2 of arm 210 of said lever acting to cam the latch 2M out of the path of movement of the line spacing bar or bail (not shown), thereby allowing line spacing movement of the platen of the record carriage as described in the Crosman Patent No. 1,946,572. A projection 28%! of said arm 2|!) will meanwhile rock the latch E82 out of the path of movement of projection I85 of arm I79 to render inoperative the carriage escapement means, also described in said Crosman patent. In neutral position the lug "I of switch member I is located between the lugs 3 and I5 of levers 8 and I5 and the ledges It and I4" of switch member I4 are located at the sides of said lugs 8 and I5, so that depression of the plus bar will cause lug l to enter between the spaced lugs 8' and I5 and depression of the minus bar will cause ledges M and I4 to miss the lugs 8 and I5 and consequently there will be no operation of either of the levers 3 or I5, or of the machine.

The primary portions of the plus and minus key devices are never locked or held against depression or actuation but as soon as a cycle of the crank arm 58' is initiated upon release of the carriage 5' and shifting thereof to the left following completion of a machine cycle the switch members 'I and I4 will be moved to their neutral positions (Fig. 3) so that any depression of either plus bar or minus bar will not initiate a succeeding machine cycle or even trip the latch lever [47 to release clutch control lever I50. If the operator should depress either plus bar or minus bar prematurely during the course of a program sequence of operations, that is before the cycle of crank arm 58 has taken place, the switch members I and M being thereby raised, the lug l and the ledges l4 and I4" of said members will miss the lugs 8' and i5 of the levers 8 and It: as aforesaid. In this case, the springs 4'6 and fit will tension the said switch members 7 and H1 against the lugs 8' and I5 and in order to start the machine cycle the operator will be obliged to release the plus bar or the minus bar and depress it again. The switch members I and M will however be moved from their neutral positions to their normal or to their reverse operation positions by the aforesaid supplemental carriage controlled means, so that the machine never stands idle with the switch members in neutral position.

Disk #3 may obviously be provided with a plurality of peripheral notches it, each of which will function for a separate column.

I claim:

1. In a listing calculator, having an accumulater, sign control means, and means for adjusting the sign Control means and for initiating registration of either of opposite signs in said accumulator-including a normal operation key device having a plus bar and a reverse operation key device having a minus bar; each key device having a switch member and a cooperating memher, and means for simultaneously and variably adjusting both switch members to operatively position the same with respect to the cooperating members of the opposite sign key devices, Whereby depression of the plus bar will result in initiation of registration of either of opposite signs in said accumulator and depression of the minus bar will result in initiation or registration of either of opposite signs reverse to the sign of registration under control of the plus bar for a given adjustment of the switch members.

2. In a listing calculator, having a shiftab-le record carriage, an accumulator, sign control means, and means for adjusting the sign control means and for initiating registration of either of opposite signs in said accumulator including a normal operation key device having a plus bar and a reverse operation key device having a minus bar; each key device having a switch member and a cooperating member, and carriage-controlled means for adjusting simultaneously both switch members to operatively position the same with respect to the cooperating members of the opposite sign key devices.

3. In a listing calculator, having an accumulator, sign control means, and means for adjusting the sign control means and for initiating registration of either of opposite signs in said accumulator including a normal operation key device having a plus bar and a reverse operation key device having a minus bar; each key device having primary and secondary portions, and means for rendering operative the secondary portion of either key device by the primary portion of the normal operation key device and for simultaneously rendering operative the secondary portion of the other key device by the primary portion of the reverse operation key device, whereby depression of the plus bar will result in initiation of registration of either of opposite signs in said accumulator and depression of the minus bar will result in initiation of either of opposite signs reverse to the sign of registration under control of the plus. bar.

4. In a listing calculator, having a shiftable record carriage, an accumulator, sign control means, and means for adjusting the sign control means and for initiating registration of either of opposite signs in said accumulator including a normal operation key device and a reverse operation key device; each key device having primary and secondary portions, and carriage-controlled means for rendering operative the secondary portion of either key device by the primary portion of the normal operation key device and for simultaneously rendering operative the secondary portion of the other key device by the primary portion of the reverse operation key device.

5. In a listing calculator, having a shiftable record carriage, an accumulator, sign control means, and means for adjusting the sign control means and initiating registration of either of opposite signs in said accumulator including a normal operation key and a reverse operation key; switch mechanism interposed between the sign control means and said keys and adapted for adjustment to reverse the eiTective action of said keys, means controlled by said carriage for adjusting the switch mechanism from neutral to and holding the same in operative position relative to the opposite sign keys and means controlled by said keys for restoring the switch mechanism to neutral position following initiation of registration thereby.

6. In a listing calculator having a shiftable record carriage, an accumulator, sign control means, means for adjusting said sign control means and initiating registration of either of opposite signs in said accumulator including a normal operation key and a reverse operation key, and tabulating means for shifting the carriage, normally cooperating with the registering means and including carriage escapement means; switch mechanism interposed between the sign control means and said keys and adapted for adjustment to reverse the effective action of said keys, means controlled by said carriage for adjusting the switch mechanism from neutral to and holding the same in operative position relative to the opposite sign keys, means controlled by said keys for restoring the switch mechanism to neutral position following initiation of registration thereby, and means for disabling the carriage escapement means and the means for restoring the switch mechanism to neutral position,

'7. In a listing calculator, having a shiftable record carriage, an accumulator, sign control means, and means for adjusting the sign control means and initiating registration of either of opposite signs in said accumulator including a normal operation key and a reverse operation key; switch mechanism interposed between the sign control means and said keys and adapted for adjustment to reverse the effective action of said keys, carriage controlled means for adjusting the switch mechanism from neutral to and holding the same in operative position relative to the opposite sign keys including a latch and means for engaging said latch, and means controlled by said keys and functioning following initiation of registration thereby for releasing said latch.

8. In a listing calculator, having a shiftable record carriage, an accumulator, sign control means, means for adjusting said sign control means and initiating registration of either of opposite signs in said accumulator including a normal operation key and a reverse operation key, and tabulating means for shifting the carriage, normally cooperating with the registering means and including carriage escapement means; switch mechanism interposed between the sign control means and said keys and adapted for adjustment to reverse the effective action of said keys, carriage controlled means for adjusting the switch mechanism from neutral to and holding the same in operative position relative to the opposite sign keys including a latch and means for engaging said latch, means controlled by said keys and functioning following initiation of registration thereby for releasing said latch, and means for disabling the carriage escapement means and the latch releasing means.

9. In a listing calculator, having a shiftable record carriage, an accumulator, sign control means, and means for adjusting the sign control means and initiating registration of either of opposite signs in said accumulator including a normal operation key and a reverse operation key; switch mechanism interposed between the means controlled by said keys and functioning following initiation of registration thereby for releasing said latch.

10. In a listing calculator, having a shiftable record carriage, an accumulator, sign control means, means for adjusting said sign control means and initiating registration of either of opposite signs in said accumulator including a nor mal operation key and a reverse operation key, and tabulating means for shifting the carriage, normally cooperating with the registering means and including carriag escapement means; switch mechanism interposed between the sign control means and said keys and adapted for adjustment to reverse the effective action of said keys, carriage controlled means for adjusting th switch mechanism from neutral to and holding the same in operative position relative to the opposite sign keys including spring means for normally holding the switch mechanism in and returning the same to neutral position, a latch and means for engaging said latch, means controlled by said keys and functioning following initiation of registration thereby for releasing said latch, and means for disabling the carriage escapement means and the latch releasing means.

11. In a listing calculator, having a shiftable record carriage, an accumulator, sign control means, and means for adjusting the sign control means and initiating registration of either of opposite signs in said accumulator including a normal operation key device and a reverse operation key device; each key device having a switch member and a cooperating member, means controlled by said carriag for adjusting the switch members from neutral to and holding the same in operative position relative to the cooperating members of the opposite sign key devices and means controlled by said key devices for restoring the switch members to neutral position following initiation of registration thereby.

12. In a listing calculator, having a shiftable record carriage, an accumulator, sign control means, means for adjusting the sign control means and initiating registration of either of opposite signs in said accumulator including a normal operation key device and a reverse operation key device, and tabulating means for shifting the carriage, normally cooperating with the registering means and including carriage escapement means; each key device having a switch member and a cooperating member, means controlled by said carriage for adjusting the switch members from neutral to and holding the same in operative position relative to the cooperating members of the opposite sign key device, means controlled by said key devices for restoring the switch members to neutral position following initiation of registration thereby, and means for disabling the carriage escapement mean and the last named means for restoring the switch members to neutral position.

13. In a listing calculator, having a shiftable record carriage, an accumulator, sign control means, and means for adjusting the sign control means and initiating registration of either of opposite signs in said accumulator including a normal operation key device and a reverse operation key device; each key device having a switch member and a cooperating member, carriage controlled means for adjusting the switch members from neutral to and holding the same in operative position relative to the cooperating members of the opposite sign key devices including a latch and means for engaging said latch, and means controlled by said key devices and functioning following initiation of registration thereby for releasing said latch.

14. In a listing calculator, having a shiftable record carriage, an accumulator, sign control means, means for adjusting the sign control means and initiating registration of either of opposite signs in said accumulator including a normal operation key device and a reverse operation key device, and tabulating means for shifting the carriage, normally cooperating with the registering means and including carriage escapement means; each key device having a switch member and a cooperating member, means controlled by said carriage for adjusting the switch members from neutral to and holding the same in operative position relative to th cooperating members of the opposite sign key devices including a latch and means for engaging said latch, means controlled by said key devices and functioning following initiation of registration thereby for releasing said latch, and means for disabling the carriage escapement means and the latch releasing means.

15. In a listing calculator, having a shiftable record carriage, an accumulator, sign control means, and means for adjusting th sign control means and initiating registration of either of opposite signs in said accumulator including a normal operation key device and a reverse operation key device; each key device having a switch member and a cooperating member, carriag controlled means for adjusting the switch members from neutral to and holding the same in operative position relative to the cooperating members of the opposite sign key device including spring means for normally holding the switch members in and returning the same to neutral position, a latch and means for engaging said latch, and means controlled by said key devices and functioning following initiation thereby for releasing said latch.

16. In a listing calculator, having a shiftable record carriage, an accumulator, sign control means, means for adjusting the sign control means and initiating registration of either of opposite signs in said accumulator including a normal operation key device and a reverse operation key device, and tabulating means for shifting the carriage, normally cooperating with the registering means and including carriage escapement means; each key device having a switch member and a cooperating member, means controlled by of registration said carriage for adjusting the switch members from neutral to and holding the same in operativ position relative to the cooperating members of the opposite sign key devices including spring means for normally holding the switch members in and returning the same to neutral position, a latch and means for engaging said latch, means controlled by said key devices and functioning following initiation of registration thereby for releasing said latch, and means for disabling the carriage escapement means and the latch releasing means.

LORING PICKERING CROSMAN.