US2234263A - Data checking means - Google Patents

Description

March 11, 1941. c. D. LAKE ETAL D ATA CHECKING MEANS Origin a1 Filed Aug. 51, 1938 11 Sheets-Sheet 1 f INZpEyOR-S ATTORNEY March 11, 1941. c. D. LAKE E'fAL I DATA CHECKING MEANS Original Filed Aug. 31, 1938 ll Sheets-Sheet 2 m k mm.

f JNFgJORS W :SZMZAQ/ ATTORNEY March 11, 1941. c. D. LAKE EIAL- DATA CHECKING MEANS Original Filed Aug. 31, 1938 ll Sheets-Sheet 3 ATTORNEY mwm March 11, 1941.

c. D. LAKE EI'AL DATA CHECKING MEANS Original Filed Aug. 31, 1938 ll Sheets-Sheet 4 NNN ma 9m ETC 5 ATTORNEY March 11, 1941. c. D. LAKE EI'AL DATA CHECKING MEANS Original Filed Aug. 31, 1938 ll Sheets-Sheet 5 a JNEqNJO 'AT'TORNEY March 11, 1941. c. D. LAKE ETAL DATA CHECKING MEANS ll Sheets-$heet 6 Original Filed Aug. 31, 1938 QQE ATTORNEY March 11, 1 a; L ETAL 2,234,263

DATA. CHECKING MEANS Qx'iginal Filed Aug. a1, 1938 11 Sheets-Sheet 7 S R Y 0% E ww Mm 0 M W Um l f MI I March 11, 1941. c. D. LAKE ErAL DATA cnzcxme umms l1 Sheets-Sheet 8 Original Filed Aug. 31, 1938 March 11, 194-1. c LAKE ETAL 2,234,263

DATA CHECKING MEANS Original Filed Aug. 31, 1938 ll Sheets-Sheet 9 CARD CYCLE mama/770m OF .sHA/ r /Z.9)

679/?0 LEVER ATTORNEY March 11, c LAKE ETAL 2,234,263.

DATA cnzcxme muss Original Filed Aug; 31. 1938 11 Shets-Sheet 1o ATTORNEY March 11, 1941.

Original Filed Aug 314,, 1938 C. D. LAKE ETAL DATA CHECKING MEANS 11 Sheets-Sheet 11 II za/VE um:

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ywwyw A'ILTORNEY Patented Mar. 11, 1941 UNITE-D STATES PATENT OFFICE DATA CHECKING MEANS Original application August 31, 1938, Serial No.

Divided and this application June 14,

1939, Serial No. 279,014

13 Claims.

This case relates to automatic transcribing machines, and is a division of application Serial No. 227,784, filed August 31, 1938.

The present invention deals specifically with a recording machine controlled by tabulating cards bearing data and control indicia in the form of coded perforations or designations. It is to be understood, however, that this invention may be used in conjunction with data derived from a record tape or sheet, or from a remote source, either through electric, pneumatic, or equivalent circuit means, or through mechanical means.

The machine comprises a recording and transcribing unit which includes recording elements operated in accordance with the items received from a record source for recording the items on a. receiving sheet carried in the recording unit. The operation of the recording elements is cffected automatically under control of the corresponding designations received from the record source. The recording element selected for operation should correspond to the controlling code or item designation transmitted from the record source.

The primary object of the present invention is to counteract incorrect selection and operation of the transcribing and recording means by the record data.

. The object may be stated as the provision of means for checking the accuracy of operation of a data transcribing apparatus intranscribing or interpreting the data designations derived from a. record source such as record cards or the like.

The object of the invention is, more specifically, to manifest the failure to select and operate the recording element accurately corresponding to the controlling item designation.

It is contemplated, further, that the manifestation of an incorrect operation of the recording means be efiected by interrupting operation of the controlling section of the machine, so as to prevent further control by record designations after an incorrect recording has taken place.

4 The object, further, is to provide means within the recording unit itself for coacting with the item designation transmitting means to check whether the recording element selected for operation is 50 the one corresponding to the controlling designation.

Otherobjects of the invention will be pointedout in the following description and claims and illustrated in the accompanying drawings, which disclose, by way of example, the principle of the invention and the best mode, which has been contemplated, of applying that principle.

Inthe drawings:

Fig. 1 is a plan view of the machine with the control section uncovered.

Figs. 2 and 3 are sections, respectively, along lines 2-2 and 3-3 of Fig. 1. v

Fig. 4 is a sectional front view of the designation sensing means.

Fig. 5 is an enlarged plan view of the drive mechanism for the machine.

Fig. 6 is a section along line 6-6 of Fig. 1.

Fig. 7 is a front sectional view of the zoning system or translating means of the transcribing section of the machine.

Fig. 8 is a top sectional view of the zoning system.

Fig. 9 is a front view of the bars of the zoning system.

Fig. 10 is a section along line Ill-l0 of Fig. 8;

Fig. 11 is a detail sectional view of the restoring means for the comb bars of the zoning system.

Fig. 12 is a section along line I 2l2 of Fig. 5. Fig. 13 is a section along line l3--I3 of Fig. 8. Fig. 14' is a side sectional view of the main clutch.

Fig. 15 is a detail view of the clutch arm contacts.

Fig. 16 is a time chart of the card cycle.

Fig. 17 is a time chart of the zoning and recording cycle. v

Fig.- 18 shows the record card punched to indicate the various item and control codes.

Fig. 19a shows theupper part of the circuit diagram.

Fig. 19b is a continuation of Fig. 19a.

THE TBANSCBIBING UNIT While the invention may make use of any suitable recording unit, it is preferred, for illustrative-purposes, to disclose the invention herein in connection with a recording apparatus, the general principles of which are disclosed in Patents Nos. 1,777,055, and 1,873,512. Fig. 1 shows the arrangement of levers III for causing the operation top four comb of transcribing elements and related control decontrols case shift; lever llI--CR controls the carriage return operation; and lever l-SP controls the operation of intra-line spacing means.

Referring to Fig. 6, depression of a lever Ill releases a latch H from a cam 12 permitting the latter to be forced by a lever l3 against a constantly rotating friction shaft l4. The latter rotates the cam, causing the carrier l5 of the cam to rock in a direction for depressing connected link 16. This link, through a linkage l1, propels a type bar l8, mounted on type basket l9, against the sheet of paper on the platen 20, thereby typing the character corresponding to the depressed lever l0. During the end of the stroke of type bar l8, it strikes a universal bar 22 to actuate the escapement control 23 for effecting a character or intra-line spacing operation of the carriage 24. Operation of the space lever l0--SP acts through associated elements ll, l2, l3, l5, and I6 to operate a linkage 25 for also actuating escapement control 23 to cause an intra-line spacing operation of carriage 24.

The carriage return means operated by lever Ill-CR may besuch as disclosed in Patent 1,955,614. As usual, the carriage return is preceded by a line spacing operation, and after the carriage has returned to the beginning of the line, repeat depressions of the lever Ill-CR will effect repeat line spacing operations.

The tabulating means may be such as disclosed in Patent 1,935,436, and includes the usual settable tabular stops set in accordance with a desired lateral spacing of item lists and other information across the record sheet. Depression of the lever IllTAB controls the tabular spacing as governed by the positions of the tab stops.

Peculiar to the present invention are the following:

Normally closed switches 26 (Fig. 6), one as- 40 scciated with each cam l2, are provided to be used in checking the accuracy of transcription of the card data, in a manner which will be, explained later. When a lever I0 is depressed to cause release of the cam l2 associated therewith,

45 the rotor I4 imparts half a turn to the cam to cause operation of the type bar. During this movement of cam 12, it rides past the long blade of the associated switch 6 and momentarily opens the switch.

RECORD CARD AND Coma:

The cord card T, as indicated in Fig. 18, has eighty designation columns, each with twelve index points or perforation-receiving positions known as the 9, 8-1, 0, 11, and 12 positions, and perforations in which are known as the 9, 81, 0, 11, and 12 perforations.

The columns of a card T are perforated according to the information to be listed or transscribed under control of the card, and the various codes designating the information are shown in Fig. 18. The codes may be considered as divided into several zones. The single point zone includes single perforations in any of the 9, 8-1, 0, 11, and 12 positions of a card column. The 9, 8-1, 0 perforations in this zone represent, respectively,

these numerals, the 11 perforation represents a tabular operation, and the 12 perforation represents a carriage return operation. The 12 zone comprises a common 12 perforation plus one of the perforations 1 to 9 representing letters A to I. The 11 zone comprises the common 11 perforation plusoneof the 1 to 9 perforations, representing letters J to R. The 0 zone comprises the common 0 perforation accompanied by a 2 to 9 perforation representing letters S to Z. The 11-12 zone comprises common 11-12' perforations plus a 1 to 7 perforation representing different symbols. The 1112 code alone represents a high speed (H. S.) eject operation to be controlled by the card. In each combination hole code, the common zone perforation or perforations may be referred to as the zone distinguishing perforation, point, or characteristic. In the single point zone, the imperforate or solid portion of the column may be considered as the zone characteristic. The character or function distinguishing points of each zone are the 1 to 9 perforations which may be referred to as the intrazone points or characteristics.

DRIVE MECHANISM Referring to Figs. 1 and 5, the drive mechanism includes a motor 35. Motor 35 through a coupling 36 rotates a pinion 3! which drives a gear 38 on a shaft 39 carrying a worm 46. Worm 40 meshes with a worm wheel 42 on a sleeve shaft 43 rotatably mounted on a shaft 44.

Main clutch.--One end of the sleeve shaft 43 is provided with a driving clutch ratchet 45 (also see Fig. 14) having four teeth, ninety degrees apart. Fixed to shaft 44 adjacent driving ratchet 45 is a plate 46 formed with four equally spaced notches 46a ninety degrees apart. Loosely carried by shaft 44 adjacent plate 46, is a cam disk 41 with four cam teeth 41, each adjacent one notch 46. Plate 46 pivotally carries a clutch pawl 48 having an intermediate tooth 48a to engage a tooth of driving ratchet 45. The free end of pawl 48 carries a stud 48b passing through a hole 466 in plate 46. Adjacent stud 48b, pawl 46 has a pin 460 connected by a spring 49 to a pin 460 on plate 46. The spring tends to-move pawl 48 inwardly to engage its tooth 480. with a tooth of driving ratchet 45, but this action is prevented while the high cam portion of a tooth 41a of disk 4'! is engaging stud 48b of the pawl. The disk 41 is held in such a declutching position by engagement of the flat side of one of its teeth 41a with the nose of a latch arm 50 fixed to one end of a shaft 5| which at the opposite end carries the armature lever 52 of main clutch magnet 53. The lower, free end of armature lever 52 is located between a pair of adjustable stop screws 54 which limit the retracted and attracted positions of the armature lever, its shaft 5|, and latch arm 50. A spring 55 connected to armature lever 52 and a spring 56 connected to latch arm 50 combine to hold the armature lever in retracted position, with the latch arm in position to engage a tooth of disk 41. Spring 56 connects arm 50 to an impositive latch arm 51 provided with a roller 51a. riding on the periphery of disk 46, and adapted to enter a notch 46a of plate 46 to detain, impositively, this plate in one of the four positions, ninety degrees apart, at which the declutching takes effect. Arm 51 isfast to a shaft 58 which carries a dependent arm 59 (Fig; 15) located between the adjacent spring blades 60 and 6| of a pair of switches 62 and 63 tending to open. When arm 51a is seated in a notch 46a, switch 62 is closed and switch 63 open. These switches may be referred to as the clutch arm contacts. During rotation of disk 46, arm 51 will be cammed out of notch 46a, causing arm 59 to close switch 63 and permit switch 62 to open. The arm 51 will move into a notch 46a every ninety degrees of rotation of plate 46, intermittently closing switch 62 and opening switch 63.

When main clutch magnet 53 is energized, it

rocks armature lever 52, shaft and latch arm 50 counterclockwise (Fig. 14). The latch arm withdraws from an arm 41a, releasing cam disk 41 and enabling spring 49 to move stud 48b inwardly. The stud acts against the curved cam side of a tooth 41a of disk 41 to rock the disk clockwise, bringing the tooth 41d previously engaged by arm 50 below the nose of the latter. As pawl 48 was rocked inwardly by spring 49, its clutching tooth 48a engaged with a tooth of driving ratchet 45, thereby coupling the driven shaft 44 to the sleeve shaft 43 of the ratchet. With pawl 48 in its inner clutching position, stud 48b thereof is seated in the crotch between two teeth of cam disk 41, forcing the latter disk to rotate with the pawl. Upon deenergization of main clutch magnet 53, latch 50 intercepts one of the four teeth of disk 41, rocking the latter to cam the pawl 48 out of clutchingengagement with ratchet 45. Referring to Figs. 5 and 12, driven shaft 44 rigidly carries a pinion 65, meshed with three sun gears 66 rotatably carried by the three arms of a carrier 61 which is fixed at its center to the reduced end of the hub sleeve 68a of a normally stationary disk 68. With disk 68 stationary, carrier 61 is at rest, and sun gears 66 are capable only of simple rotation by pinion 65. Rigid with each gear 66 is a pinion 69 meshed with a gear fast to one end of a sleeve 1| surrounding shaft 44. To the opposite end of the sleeve 1| is fast a pair of gear 12 and 13. With shaft 44 coupled, as previously explained, to driving ratchet 45 for rotation, and with driven clutch disk 68 held against movement, pinion 65 of shaft 44 actuates gearing -66, 69, 10, 12, and 13 as a simple train of'gearing. Gears 12 and 13 then rotate at normal speed.

Gears 12 and 13 on shaft 1| drive elements of the control section including card feed means which will be described later. During operation of these gears, the card is fed at a speed such that one column thereof traverses a given reference line during one-quarter turn of main clutch shaft 44. The period of such travel of a card column is equal to but not coincident with one cycle point of the card cycle indicated in Fig. 16. The card cycle may be considered as the interval between arrival at a reference line of. similar points of successive cards. During eighty points of the card cycle, the eighty card columns of a card traverse analyzing means described subsequently. A gap of ten cycle points then occurs before the next card cycle begins on the next card.

Zoning cycle commutators.-Shaft 39 (Fig. 5) is driven continuously by the motor and carries commutators HS which may be referred toas the zoning cycle commutators. The speed of shaft 39 is four times that of main clutch shaft 44, so

' that one revolution of this shaft, as well as of its commutators HS, corresponds to a quarter turn of shaft 44 which. in turn, corresponds to one card cycle point. The revolution of shaft 39 may be referred to as the zoning cycle (Fig. 17).

Shaft 39 also carries a zoning cycle index wheel III) to index the zoning cycle positions of shaft 39 and the elements actuated thereby.

Drive for zoning nnit.-To the left end I Fig. 1) of shaft 39 is fixed a bevel gear 2 which meshes with a bevel gear II3 on a downwardly inclined shaft I I5. This shaft at its lower end has a bevel gear I I1 meshed with a bevel gear II8 on a horizontal shaft II 9 (see Figs. 1, 2, and 7). Shaft I I9 is provided with a pin I20 seated in the bayonet slot |2I of a sleeve coupling I22 mounted on the shaft. In line with shaft 9 is a shaft I 23 which has a transverse, coupling pin I23a (Fig. 7) slidable into the open, end slots I22a oi coupling I22. A spring I24 urges coupling I22 towards the left (Figs. 2 and 7) for maintaining the rear end of the horizontal portion of the bayonet slot I2I in engagement with pin I20.

'In this position, as indicated in Fig. 7-, the slots I22a of the coupling sleeve I22 are receiving the pin I23a, thereby coupling shafts H9 and I23 for common rotation. To uncouple shaft I23 from shaft II9, coupling sleeve I22 is forced rearwardly until pin I2I is at the vertical portion of the bayonet slot, withdrawing slots I22a from pin I23a, and then the coupling sleeve is rotated to engage the pin I20 in the vertical portion of the bayonet slot, thereby maintaining the coupling sleeve in rear, release position.

With sleeve I22 in normal, coupling position, the shaft 39 drives shaft I23 one-to-one to make one revolution each zoning cycle. Shaft I23 is the actuating shaft of the zoning or code-translating system to be described later.

The control section (card handling section) Referring to Figs. 1, 2, and 5, gears 12 and 13 of the clutch-driven shaft 1|, operate the card reading or handling unit or control section. Gear 13 meshes'with and drives a gear I28 fixed to a cross shaft I29 on which are mounted commutators CF which may be referred to as the card feed commutators. Shaft I29 and the parts mounted thereon and including commutators CF make one revolution for each card cycle. As shown in Fig. 5, a disk I30 is attached to gear I28. This disk I30 is suitably graduated to indicate the card cycle. l

Card picker means.-Referring to' Fig. 2, shaft I29 carries complementary camsI3I for engaging rollers I32 and I32 provided on opposite arms of a lever I33. Lever I 33 is connected by a link I34 to a picker slide I35 provided at the rear with a picker knife I 35' for engaging therear edge of the bottom card T of the stack of cards in supply magazine I36. The cards are stacked in magazine I36 in the predetermined order in which their data are to be listed, and the cards lie lengthwise in the magazine, with the columns extending crosswise. During each card cycle or revolution of shaft I29, its cams I3I, acting through lever I33, link I34, and slide I 35, reciprocate the picker knife I35 to feed the bottom card out of the magazine I36 and into the grip of upper and lower feed rollers I31 and I38. Since shaft I29 makes one revolution each card cycle, one card is fed to feed rollers I31 and I38 each card cycle.

Card feed rolls and analyzer.-Gear 12 of the clutch driven shaft 1| meshes with a gear I on the shaft of lower card feed roller I38 (see Figs. 1, 2 and 4). The, shaft of the lower roller has a gear I16 meshed with a gear IT! on the shaft of .upper feed roller I31, so that the upper and lower feed rollers rotate in unison.- A previously described, picker blade I35 feeds a card T out of supply magazine I 36 and into the grip of feed rollers I31 and I 38 each card cycle. The

feed rollers continue the feed of the card moving it at the rate of one column each cycle point.

Between the mouth of the supply magazine and acting as the common of the card sensing means.-

Coacting with roller I31 are twelve sensing brushes SB9 to 0, II, l2, respectively to sense index positions 9 to 0, 11 and 12 of a card column, while another-brush SB-c acts as a common return brush, being located to the side of the card and in constant engagement with roller I31 (see Fig. 4). Lower feed roller I38 is grooved to hold thefree ends of the brushes in predetermined transverse spacing and enable the brushes to extend substantially in tangential engagement with the lowest part of the feed and contact roller I31 in order to sense the card.

The above described card analyzing means, SB-I31, analyzes the perforations of the card columns in succession, one column after another, to control the decoding, interpreting or zoning system to be described later.

Card stacker.-As a card is fed by the rollers I31 and I38 past. the analyzing means, it moves underneath a flexible plate I80, supported at the rear end, underneath a weighted plate I8I pivoted at its rear end, and into delivery magazine I82.

Both plates I80 and I8I are cut out to permit a rubber arm I83 to rotate through and past the plates, so as to wipe the card and complete its ejection into the delivery magazine. Arm I83 is carried by a shaft I84 on which is a gear I85, driven through gears I86, I81, and I88 from gear I on the lower feed roll shaft. The gear ratio is such that arm I83 makes one revolution each card cycle to complete the ejection of the card analyzed during this cycle.

The stack of ejected cards in delivery magazine I82 rests on a bottom plate I90 hinged at its front end on a pivot I9I. To the bottom of plate I90 is fast. a bracket I92, passing through a slot I93 in the side wall of the magazine and rigidly provided outside the latter wall with a rack sector I94. Sector I94 meshes with a gear I95 (see Figs. 2 and 3) coacting with a horizontal rack I96 provided on a sleeve I91 which slides inside a fixed tube I98. The rack I96 passes through a narrow slot in tube I98, preventing rotation of the sleeve I91. Between tube I98 and sleeve I91 is a coil spring I99 tending to move the sleeve to the left (Fig. 3). With no cards on plate I90,

spring I99 is holding sleeve I91 at its left hand limit. As the cards stack up on plate I90, their weight depresses rack sector I94 which, through gear I95 and rack I96, causes sleeve I91 to move- 'edge of bracket I92 with an insulating tab 200 fixed to the lower blade I of a switch 203, thereby opening such switch to interrupt operation of the card feed unit, in a manner which will be explained later.

ZONING UNIT The zoning unit includes twelve horizontal, parallel comb bars 2I0, disposed one above another, and located at a distance below the typewriter keyboard, as indicated in Figs. 6, 10, and 13. Each comb bar corresponds to a different index position of a card column and may be distinguished by referring'to it as the comb bar of the corresponding index position. Thus, bars 2| 0-9, 8--I, 0, II, I2 correspond to index positions 9, 8-1, 0, 11, 12 and their positions are indicated in Fig. 13.

Each of the comb bars 2I0 is formed with front lugs 2I9a arranged for combination with lugs of the other combs to govern interpretation of a perforated designation code. Each comb bar has a single rear lug 2I0b, and the lugs 2I0b of the several combs are staggered horizontally to enable each lug to be engaged by the free end of one of the twelve staggered armature levers 2I I, as indicated in Figs. 6 and 8. Each armature lever 2 is operated by one of the twelve zone magnets 2I2, arranged in two horizontal layers and staggered to enable the armature levers to dispose their free ends in engagement with the staggered lugs 2I0b of the several combs 2I0. A pair of opposite, end guide combs 2I3 and a central guide comb 2I4 (Fig. 7) guide the combs 2 I 0 for horizontally slidable movement, A spring 2I5 connects to each comb 2I0 urges it towards the left to normal position determined by engagement of a screw 2I6 (Figs. 6 and 8), carried by the armature 2| I, with the frame plate 2". Upon energization of a zone magnet 2I2, it rocks its armature lever 2II counterclockwise (Fig. 8) causing the armature lever, by engagement with the associated lug 2I0b, to shift the corresponding comb bar 2I0 to the right.

Extending in front of the combs 2I0 are a plurality of spaced vertical levers 2I8 urged towards the combs by springs 2I9. The lower tip of each lever follows a cam 220 extending across the levers and fixed to shaft I23. As previously explained under the heading Drive mechanism, shaft I23 is continuously rotated, through a coupling I 22, from motor-driven continuously rotating shaft II9. Shaft I23 makes one revolution each zoning cycle (Fig. 17), as previously stated, and once each zoning cycle, cam 220 releases levers 2 I8 for forward movement by springs 2I9. During each zoning cycle occurring between 1 and 80 of the card cycle, a column code analyzing period is provided during which analyzing means SB-I31 is effective to analyze one card column for a designation or code. In accordance with the analysis, selected combs 2!!! are shifted to the right, to displace their front comb lugs 2 I011 from in front of the lever 2I8 corresponding to the character or function represented by the analyzed perforated code in the active card column. There will be no other lugs 2I0a in front of the latter lever 2I8 but one or more lugs remain in front of the rest of the levers 2I8. Accordingly, when cam 220 releases lever 2 I 8 for inward movement, only one of these levers is enabled to move inwardly to a sufiicient extent to bring the shoulder 2 I8a of the lever above a common lift bail 22I. Bail 22I extends across all the levers 2I8 and is provided with rollers 222 at each side following cams 223 fixed to zoning cycle shaft I23. Thus, for each cycle point or analysis of one card column, bail 22I is given one reciprocation. During the rise of the bail, by engagement with the shoulder 2 I8a of that vertical lever 2I8 which has been released by the combs 2I0, the bail lifts the lever. The upper end of each lever 2I8 is pivotally connected to a lever 224 urged counterclockwise (Figs. 6 and 13) by a spring 225 and pivoted to a link 226. Each link 226 is provided at its upper end with a stud 226a freely passing through a vertically elongated slot 221 in an associated one of the horizontal,

operating levers III of the transcribing unit. To

maintain, releasably, the side of link 226 firmly against the side of the associated lever l0 and prevent accidental withdrawal of stud 226a, a flat spring 228 is fixed to the side of each link 221, the spring and link engaging the associated lever In between them.

When the lever 2I8, which has been selected by combs 2"), is lifted by bail 22l, it rocks lever 224 clockwise (Fig. 6) against resistance of spring 225, thereby lowering link 226 to depress the corresponding operating lever Ill. Depression of the lever ill effects the recording or other function of the transcribing unit as denoted by the code in the analyzed card column.

As indicated in Fig. 9, the combs 2l0 have front lugs 2l0sp. The lugs 2l0sp of the twelve combs are in vertical alinement and located directly to the left (Figs. 7 and 8) of the vertical lever 2 l8sp. No matter which designation is sensed on a card T, at least one of the combs 2I0 will be moved to th( right, thereby placing its lug 2l0sp in front of lever 2| 8sp to prevent its coaction with the lift bail 22l. Lever 2l8sp is operatively connected with the intra-line space operating lever I0SP. Thus, when any code is sensed and interpreted, causing actuation of one or more of the combs 2H], lever 2l8sp will be blocked against operation, permitting the intra-line spacing of the carriage 24 (see Fig. 6) to occur only as the usual incident to the operation of the lever l0 corresponding to the character whose designation has been found in the analyzed card column.

When the card column traversing the analyzing means is blank, then an operation of intraline space lever Ill-SP is indicated. Thus, failure to sense any perforation in a card column leaves all the bombs 2| ll in their normal positions, with all the lugs 2lllsp out of the path of lever 2l8sp which thereby is enabled to move forward to cooperate with lift bail 22| for operating space lever I0SP to effect an intra-line spacing of the carriage 24.

During the period of each cycle between the departure of one card from the analyzing means and the arrival of the next card, and whenever main clutch shaft 44 is at rest, none of the combs 2H1 is actuated. Accordingly, operation of intraline space lever I0Sl? would be effected, undesirably, under control of operating lever 2l8sp each cycle of shaft I23, unless provisions were made to the contrary. To lock out the operating lever 2l8sp under the above conditions, a space lock magnet 230 (Figs. 8 and 13) is provided, energization of which rocks its armature 23l downwardly, to rock a lever 232 clockwise (Fig.

13) against resistance of a spring similar to spring 225. Pivotally suspended from lever 232 is a lock arm 233 urged towards the right (Fig 13) by a spring similar to spring 2l9. The lower end of arm 233 is formed with a bent lug 233a, from an intermediate portion of which a tab 233?) projects parallel to the side of arm 233. The inward. movement of arm 233 is limited by engagement of tab 233D thereof (see also Fig. 8) with the front of the bottom guide comb 234 of the operating levers 2|8. Thus, upon clockwise rocking of lever 232, efiected :by armature 23! upon energization of magnet 230, lock arm 233 will be moved vertically upward. The outer, reduced end of lug 23311 of am 233 overlaps operating lever 2l8sp and normally lies against the back of the lever, entirely below and out of a notch 2l8'sp formed on the space operating lever (see Fig. 13). When lock-arm 233 is lifted as a result of energization of magnet 23D, lug 233 moves upwardly into notch 2l8'sp, thereby locking lever 2l8sp against inward movement, Thus, even though none of combs 210 is actuated, if magnet 230 is energized, it will cause locking of the space bar operating lever 2l8sp.

To time the impulses to space lock magnet 230 for each column or cycle point, a switch 235 is provided which is closed by lift lbail 22l when the bail is in lower position and which opens when bail 22l rises. Since bail 22! is given one reciprocation each cycle point, switch 235'will open and close once for each cycle point. It is to be understood, however, that switch 235 does not, of itself, close the circuit of magnet 230. The latter circuit will be traced hereinafter.

Both the digit 1 and the letter L are printed by the L type bar IS. The code for number I is a 1 perforation'while the code for L is X--3 (see Fig. 18). Thus, when either of these two different codes is sensed, the same type bar I 8 must operated. To accomplish this, the intermediate, horizontal lever 224-L connected to the L operating lever 2|8L and the lever 224-l connected to the I (numerical) operating lever 2|8--| are rigidly bridged by bars 236 (Figs. 7 and 8). Only the lever 224 of the L linkage is connected by a link 226 to the L lever I0, while lever 224 of the numerical I linkage is not connected to anylink 226. Accordingly, when an L code is analyzed, the "L lever 2! will act through the connected lever 224v and link 226 to operate the L lever l0. When .the 1 code is analyzed, the 1 lever 2| 8, acting through its asociated lever 224 and bridge pieces 236 will rock the L lever 224 to effect operation of the L lever ill, just as when an L code is analyzed.

All the letters are preferably typed in upper case, as capitals, and all the numerals are typed in lower case. As may be understood from the showing of the codes in Fig. 30, all the alphabet codes A to Z are combinational codes which include an intrazone characteristic 1 to 9 and one of the zone characteristics 0, X, or R, While the numerical codes 1 to 9 are single hole codes. The digit 0 (zero) is represented by a single perforation in the 0 position. As willbe explained in detail in connection with the circuits, whenever zone and in-trazone perforations occur together in a card column, denoting a letter of the alphabet, the analysis of these two per orations causes energization of a double coil shif magnet 240 (see Figs. 8 and 10). When only a single perforation, intrazone or zone, is analyzed in a card column, then the shift magnet remains deenergized. Thus, the numerical codes will be interpreted by lower case type bar operations -while the alphabet codes will be interpreted by Energization of upper case type bar operations. magnet 240 rocks its armature 24l downwardly, and the armature acts through a link 242 to depress the right hand shift lever lli-SH, thereby' effecting an upper case shift. This shift is timed to occur just before the operation of the lev r 0 rr p din to the code in the analyzed column, as will be explained hereinafter. Thus, an alphabetic code not only controls the selection of the type bar for printing the letter represented thereby but also preliminary upper case shifting operation.

Towards the latter part of the revolution of shaft I23 of the zoning system, a cam 250 thereof (Figs. 7, 8, and 10) effects clockwise rocking (Fig. 10) of a lever 25L The upper end of lever 25| bears against the arm 252a of a knockoff bail 252 (also see Fig. 11) which has an arm 2521) extending vertically across the right hand edges of all the combination combs 2). Upon clockwise rocking of lever 25I by cam 250, the upper end of the lever rocks bail 252 clockwise (Fig. 11) causing arm 252b thereof positively to engage and return all the combs 2l0 to the left. Thus, the

combs 2H] and the armatures 2 are positively restored at a definite, latter portion of the cycle of shaft 223, after which the springs 2I5 connected to the combs yieldingly maintain the combs in their restored positions.

The mechanical features of the zoning system have been explained above. Further explanation of its operation will be given as an incident to the description of the circuits.

CIRCUITS, TIMING, AND OPERATION Referring to Fig. 191), with main line switch SW closed, motor 35 is in operation, the motor circuit including safety contacts I4 I. I

In the following description, it is assumed the parts are initially in 0 cycle position of the card cycle (see Fig. 16).

Having brought the first line of a sheet to printing position on platen 20 of the recording unit, and having placed the stack of cards T bearing the data for the bills in supply magazine I36, the operator may start operations by depressing the start key to close start key contacts ST, forming the following circuit (bottom of Fig. 19a):

Start key circuit-From the left side, through contacts ST, normally closed relay contacts R--I1b, relay coil R-1, to the right side.

Due to energization of coil R'-1 bythe start key circuit, relay contacts R1b close to form the main clutch circuit (lower part of Fig. 19a) Main clutch magnet circuit.From the left side, through normally closed contacts 28, relay contacts R3b, now-closed relay contacts R.1b, normally closed relay contacts RP-22b and R--I4c, relay contacts R-21b (now closed due to initial energization of a coil R21, in a manner which will be explained later), normally closed relay contacts R-IDb, main clutch magnet 53, and to the right side.

With clutch magnet 53 energized, shaft 1I, through gears 12 and 13 (see Fig. 5), actuates the card feeding means. At the 0 cycle point, picker I35 (Fig. 2) is in advanced position, ready to begin its return stroke (see Fig. 16). As the machine is now set in operation for the first card cycle, the picker is moved through its return stroke, and at the end of this stroke, at about the 64th cycle point, the picker is at the rear of the bottom card T in magazine I36 (see Fig. 2). The picker then dwells until about '10 of the card cycle at which point it begins its forward stroke to feed the bottom card to the feed rollers I31 and I38.

The perforation field or width of the first card column or column I of the card reaches the line of sensing brushes SB shortly before the 1 cycle point of the card cycle, between the th and 90th divisions of the 0 cycle point, as indicated by the upper, "card brush timing line, in the zoning cycle chart, Fig. 17. The card brush" line indicates the periods of sensing of perforations in successive card columns by brushes SB. Between 0 and 55 of one zoning cycle, the greater and latter portion of a hole in one column is sensed and, during this period, commutator HSI is made so as to render the sensing effective to perform an analysis, as will be further explained hereinafter. After this effective analyzing period of one card column during one zoning cycle, the brushes SB sense, between and the end of the zoning cycle, the first part of the perforation of the next column, but with HS-I broken, this latter sensing is not effective to perform an analysis.

During the first card cycle, the picker started moving the first card out of magazine I36 and to feed rolls I31 and I38. On its way to the feed rolls, the card cams down card lever I18 to close card lever contacts I19 (Fig. 2) after the beginning of the 82nd cycle point. Closure of contacts I19 establishes the following circuit (top of Fig. 19a) Card lever circuit.'From the left side, through contacts I19, relay coils R-I and R2, to the right side.

The operator need hold the start key depressed only until the first card closes card lever contacts I19 to form the card lever circuit energizing coils R-I and R2. Coil R2 closes contacts R-Zb (bottom of Fig. 19a), shunting start key contacts ST through the following shunt circuit:

Start key shunt circuit.From the left side, through relay contacts R2b, stop key contacts SK, stacker contacts 203, stick contacts R1a (previously closed), relay coil R-1, and to the right side.

Coil R1 remains energized until either no cards remain in supply magazine I36, or upon manual depression of the stop key to open contacts SK, or when, the stacker magazine I82 being full, contacts 203 open.

There is a gap between successive cards feed ing from magazine I36, and the lagging edge of the leading card will leave card lever I18 and permit card lever contacts I19 to open at '18 of the card cycle, while the forward edge of the following card will not cause contacts I19 to make again till after 82 of the same card cycle. To maintain coils RI and R.2 energized during this open interval of card lever contacts I19, commutator CF4 makes (see Fig. 16), shunting contacts I19 through the following path (the top of Fig. 19a) Card lever shunt.From the left side, through commutator CF4, stick contacts R-Ia, coils RI, R-2, to the right side.

If the stack of cards is depleted, contacts I 19 will not be reclosed, and when commutator CF4 breaks at 84 of the card cycle, coils R-I, and R--2 will be deenergized. Contacts R2b will open and the start key shunt circuit will break to deenergize coil R 1, with consequent opening of contacts R,1b to break the main clutch magnet circuit. Main clutch magnet 53 remains energized, however, till the end of the card cycle through a shunt circuit formed through commutator CF-5 (see Fig. 16), which makes at 82 and opens at 893' The making of commutator RI4c, R-21b and R-Iflb of the main clutch magnet circuit, as indicated in Fig. 19a, permitting clutch magnet 53 to remain in effect until the beginning of the 89th cycle point. The main clutch is uncoupled, as a result, at the 80th division (see Fig. 17) of the 89th cycle point.

The analyzing or card reading period of a card cycle is indicated by the top line of Fig. 16 and extends from 1" through 80, during which period the card read commutator CF-I is made. The card lever circuit has energized coil R--I to close contacts R,Ib, forming the following circuit during the card reading period (Fig. 9a):

Coil R9 circuit-From the left side, through commutator CF--I, contacts R-Ib, wire 3Ill, coil R9, to the right side.

Coil R9 now closes the left side of transfer contacts R9b (near the top, right of Fig. 19a) and opens the right side of these transfer contacts. This condition of the contacts R--8b endures through the card reading period under control of commutator CF-I and is repeated every card cycle as long as cards continue to feed and, through the card lever circuit, maintain relay coil R--I energized to hold contacts R Ib closed in the coil R9 circuit.

During the passage of the card columns through the analyzing means SBI3I, analyzing circuits are established in accordance with the perforations in the columns. Thus, if a column has a 12 perforation, the following circuit forms (Fig. 19a):

12 zone anaZysis.--From the left side, through commutator -CF-I, contacts RIb, zoning commutator HSI (see Fig. 17 contacts R'I3b, clutch arm contacts 63 (see Fig. 15 for construction and Fig. 17 for timing), common brush SB-c, contact roll I31, brush SB-I2, the left, now closed, side of transfer contacts R--9b, through the 12 comb magnet 2I2, a pickup coil 325 in parallel. with magnet 2| 2, and relay coils R-8 and R.4, to the right side. I

The 11 analyzing circuit is as follows:

11 zone analysis.Beginning as in the above circuit and proceeding from contact roll I31 through brush SB--I I, the normally closed side of contacts RI4b, comb magnet 2I2I I, magnet 325 in parallel therewith, and through relay coils R20 and R-23 to the right side.

The 0 analyzing circuit is as follows:

0 digit or zone analysis.Beginning as in the previous analyzing circuits and proceeding from roll I31 through brush SB-fl, normally closed contacts R25b, comb magnet 2 I2--0, the magnet 325 in parallel therewith, and through coil R24, to the right side.

. circuit relay coils R-5 and Rr-l6 to the right side.

As indicated by the above analyzing circuits and by reference to the card cycle time chart (Fig. 16), commutator CF-I times the card reading period, so that after the th or last card column has passed the analyzing means, the wiping of the brushes SB'on the bare contact roll I3'I will have no effect. When the main clutch is at rest at 80 of a zoning cycle (Fig. 1'7), clutch arm contacts 53 are open to prevent the making of any analyzing circuits.

When a card column passing through the analyzing means has only a single perforation, then only one of the above analyzing circuits is established, resulting in energization of only one magnet 2I2. Thus, if the single perforation is one of 'the intrazone points, indicating a digit 1 to 9, then an intrazone analysis circuit forms to cause the recording of the designated digit. If only a 0 perforation is analyzed, indicating the digit 0, then the 0 analysis circuit is formed resulting in the recording of the digit 0. If the single point in the column is an 11 perforation, then the II analyzing circuit is established to cause operation of the tabular means. The sensing of only a 12 perforation results in a I2 analysis circuit to cause a carriage return operation. When a column passing through the analyzing means has a zone perforation plus an intrazone perforation, indicating an alphabetic character, then both an intrazone analyzing circuit and one of the zone circuits are simultaneously formed.

When a single analyzing circuit is established, only one comb magnet 2| 2 is energized to shift its associated comb 2I0. When both intrazone and zone analyzing circuits are formed simultaneously, then two of the magnets 2I2 are energized to shift their associated combs 2"). Whether one or more of the combs 2H] is shifted, only a single one of the levers 2 I8, corresponding to the character or function in the sensed column, is selected thereby for operation. The operation of the selected lever 2! does not occur until the high point of cam 220 rides off the levers 2I8 shortly before 20 of the zoning cycle (Fig. 17) All the levers 2I8 then move forward to sense comb lugs 2I0a (see Fig. 9). The comb lugs, however, are now set according to the analysis, to permit release and full forward movement only of the selected lever ZIB which corresponds to the analyzed character. This selected lever moves forwardly between lugs 2I0a of the combs,-

thereby locating its shoulder 2I8a above lift bail 22I (Figs. 10 and 13). At about 24 of the zoning cycle, circuit breaker HSI, which times the duration of the analysis of a column perforation, opens and breaks the analyzing circuits to deenergize the comb magnets 2I2. Springs 2I5 (Figs. 7 and 8) now tend to return the previously actuated combs 2") but this is prevented at this time by engagement of sides of lugs ZIOa thereof with the selected lever 2I8 which has moved forwardly between these lugs.

At 50 of the zoning cycle, lift bail 22I rises and by engagement with shoulder 2I8a of the forwardly positioned, selected lever 2 I8, lifts the latter to operate the associated lever III for causing a type bar I8 (see Fig. 6) to strike platen 20 at about 81 of the zoning cycle to record the character corresponding to the analyzed designation. At of the zoning cycle, cam 220 has withdrawn the selected lever 2| 8 from all the lugs 2I0a of combs 2I0, thus releasing the previously actuated combs for restoration by their springs 2I5. Shortly thereafter, at,about of the zoning cycle, cam 250 (Figs. 7 and 10) operates lever 25I to cause bail 252 to positively restore and aline combs 2I0 in normal positions.

The above explanation indicates the operations and timing thereof occurring during a cycle of the zoning or transcribing system and which corresponds during normal card feed to a card cycle point. means to transcribe and record the character corresponding to the designation in the analyzed card column.

As previously explained, the failure of any of the combs 2I0 to be actuated allows th lever 2I8sp to move forward for controlling an intraline space operation. Any comb 2III when actuated interposes a lug 2I0sp (Fig, 9) in the path of the lever 2 I8sp, preventing effective operation thereof. The absence of any perforation in a card column allows all the combs 2I0 to remain in normal position and permit the intra-line space lever 2I8sp (Figs. 7, 8, and 27), upon release by cam 220 at about 20 of the column cycle (Fig. 17), to move forward above lift bail 22I. As a result, when a blank'column passes These operations cause the transcribing the analyzing means, lever 2| 8sp is effective to operate lever I0-SP (Figs. 1 and 13) for effecting intra-line spacing.

Intra-line space locla-As explained above, when none of the combs 2I0 is actuated, lever 2I8sp (Fig. 13) is normally free to move forward and operate lever lap to cause intra-line spacing of the recording unit carriage 24 (Fig. 6).

A gap of ten cycle points occurs between successive cards, during which none of the combs 2III is actuated, the analyzing circuit line being broken by commutator CFI. During each of the zoning cycles or revolutions of shaft I23 occurring within said gap, when cam 220 releases lever 2 I8sp, forward movement of the lever, while not blocked now by combs 2I0, will be prevented by energization of magnet 230.

It is desired also to lock the lever 2I8sp against operation if the main clutch is uncoupled during any zoning cycle, particularly during a zoning cycle corresponding to a cycle point occurring during the card reading period; 1 to 80 of a card cycle,

The manner in which the magnet 230 is energized, under above conditions, to lock the space lever' 2I8sp will now be explained. The circuit for magnet 230 is as follows (middle of Fig. 19a) Space lock magnet circuit-From the left side, through lines 3, 3, through either contacts R9a or theclutch arm contacts 62, through lift bail contacts 235 (also see Fig. 13) and space lock magnet 230, to the right side.

Contacts R9a are opened by coil R-'-9' energized during the card reading period of a cycle by the previously traced coil R-9 circuit. Between card reading periods, coil RQ is deenergized, permitting contacts R9a to close. Thus, the space lock magnet circuit will be automatically established during the ten cycle point gap between successive cards or while the brushes SB are wiping the bare contact roll I31. During this gap, shaft I23 makes ten revolutions and none of the combs 2I0 is actuated, but lever 2I8sp remains locked by magnet 230 against operation by the lift bail 22I. In above manner, under control of contacts RSa, intra-line spacing of the recording unit is prevented between card reading periods.

If the main clutch is stopped, clutch arm contacts 62 make (see Fig. 15) and remain closed while the main clutch is at rest and while shaft I23 continues to rotate and perform zoning cycles.

As the main clutch is at rest, the card feed has been interrupted and during this period, the circuit for magnet 230 forms through closed con tacts 62. As indicated in the zoning cycle chart .(Fig. 17), the main clutch disengages at 80 of the zoning cycle or after the operations under control of the last-anaylzed card column have been completed. Lift bail contacts 235 do not close till 90 of this zoning cycle. At this point, with contacts 62 closed, the space lock magnet circuit forms, energizing magnet 23!] to prevent forward movement of lever 2I8sp above lift bail 22 I. This circuit remains in effect till of the next zoning cycle, but by then the lift bail 22I has risen and even if lever 2| 8sp were to move forward, it would be too late for the shoulder 2| 8a thereof to coact with the lift bail. Thus, during the zoning cycle following disengagement of the main clutch, intra-line spacing is prevented. As long as the main clutch remains disengaged, contacts 62 stay closed and the above locking action is repeated each zoning cycle.

Incidental alphabetic code circuits-As indicated previously, the intrazone analyzing circuits have coil R5 in common, the "0 analyzing circuit includes a coil R24, the 11 analyzing circuit includes a coil R23, and the 12 analyzing circuit includes a coil R l. When an alphabetic designation is sensed, an intrazone analyzing circuit and one of the zone analyzing circuits are simultaneously established, causing coil R5 and either coil R l, R23, or R24 to be energized. Coil R5 closes contacts RBa and coils R4, R23, or R--24 respectively, close contacts Rda, R23a, or R24a. As a result, the following circuit is established (Fig. 19a) Coil R6 circuit.--From the left side, through lines 3| I, 3I2 through the closed one of the parallel relay contacts R24a, R23a, or R Ia, serially through contacts RSa, and through shift magnet 240 and coil R6, in parallel, to the right side.

I If only an intrazone circuit has formed to close contacts RSa alone and neither the 0, 11 or 12 analysis circuit has formed to close one of the contacts R la, R23a, or R-24a, the coil R6 circuit will not form. Also, if either the 12, 11, or "0 analysis alone has been made and an intrazone analysis circuit has not formed, then contacts R5a will be open, preventing the closing of the coil R6 circuit. Thus, only for a combination code, designating a letter, is the coil R6 circuit formed and coil R6 and shift magnet 240 energized. The energization of magnet 240 eiTects upper case shift to cause the alphabetic character to be typed in upper case. The analyzing circuits also have selected a type bar for printing the letter denoted by the combinational code. The analyzing circuits are timed by commutator HSI to make between 0 and about 24 of the zoning cycle and, by then, the shift magnet 240 is energized. The type strikes the platen after of the zoning cycle; hence, the type basket I9 (Fig. 6) has been set under control of magnet 240 in upper case position before printing is effected.

The analyzing circuits break before 25 of the zoning cycle due to breaking of commutator I-ISI, causing contacts R24a, R23a, and R5a to open, but the shift magnet 240 must remain energized till after printing at 80. For thi purpose, coil R6 closes contacts RGa to form the following holding circuit (Fig. 19a):

Coil R6 holding circuit #1 .-From the right side of the line, through magnet 240 and coil R6, in parallel, through contacts RSa, line 3I3, zoning commutator HS--3, line 3III, contacts RIb, commutator CFI,-and to the left side.

When the analyzing circuits broke, normally closed relay contacts R24b, R23b, R4b, and R--5b returned to normal closed condition. Thus, a second holding circuit forms as follows:

Coil R6 holding circuit #2.From the right side, in parallel through magnet 240 and coil R6, through contacts RIia, contacts R5b, R4b, R23b, R24b, line 3), contacts RIb, commutator CF-I, and to the left side.

Holding circuit #I is timed by commutator HS-4l to form before 25 of the zoning cycle and to hold over till about 4 of the next zoning cycle. In the latter zoning cycle, a new card column is being analyzed, and the analysis is taking place while holding circuit #I is still in effect. If the card column following the one which caused the upper case shift also has an alphabetic designation, the making of contacts RSa and one of the contacts Rla, R-23a,.

or R/-24a will precede by a slight lag the opening of contacts R-"5b and R-4a, R-23a, or R-a, causing the main circuit of coil R-6 and shift magnet 240 to be closed before the preceding holding circuit #2 breaks. If the analyzing circuits make before commutator HS--3 opens, holding circuit #1 will also continue uninterruptedly in effect.

If the card column succeeding the one which caused the case shift bears a numerical code or a code which does not include one of the perforations 1 to 9v in combination with one of the perforations 12, 11, or 0 then a combination of zone and intrazone analyzing circuits will not form, and the main circuit of coil R6 and the shift magnet 240 is not closed. Hence, when commutator HS-3 breaks, holding circuit #I of the magnet is broken and holding circuit #2 will also '80 of the zoning cycle.

break due to opening of either of contacts R5b, contacts R-flb, R23b, or R-24b.

CHECKING OPERATIONS Iti intended to check and detect the accuracy of interpretation by the zoning system and the transcribing means of the analyzed codes in the card columns, and to stop card feed if a wrong interpretation and recording of a code have been made. For this purpose, the main clutch magnet circuit includes contacts R2'Ib controlled by a relay coil R-2I (lower right of Immediately upon closing of main,

Fig. 19b). switch SW, the coil R2I i energized asfollows:

Coil R-27 V circuit-From the right side, through coil R2'I, the serially connected, normally closed relay points 3251) of coils 3250 to 9, to the left side.

Coil R-2'I closes contacts RP-2'Ia to by-pass contacts 32517 through zoning cycle commutator HS-6 (see Figs. 5 and 17) which is closed during each zoning cycle or revolution of shaft I23 or 39 except for a short, interval between and 70. During this open interval of commutator HS-6, the main circuit of coil R,2'| must be efiective through closed 32% contacts of coils 325-4 to 9, but if any of these contacts is open, the main circuit of coil R2'I does not close, and contacts R2'Ib open to break the main clutch magnet circuit causing the card feed to stop at Thus, commutator HS-B breaks between 55 and 70 of each zoning cycle to enable detection of an open condition of any of contacts 325!) of coils 3259 to' 0. Contacts 325b of coils 325-9 to 0 stay closed only if the transcription of a code in a card column has been accurately made. If the card column code is not accurately interpreted and recorded, one of contacts 325b of coils 32'59 to 0 will be open, with the result that upon opening of commutator HS-6 during the same zoning cycle in which the code was analyzed, coil R2| is deenergized, contacts R-ZIb open and the main clutch magnet circuit breaks.

As brought out in the previous tracing of the analyzing circuits, there is a coil 325 in parallel with each comb magnet 2 I2 and energized simultaneously therewith. Each of coils 325-9 to 0, of the intrazone analysis circuits is the pickup coil of a double coil relay having a holding coil 325 (right of Fig. 19b). Thus, upon formation of an intrazone analyzing circuit, one of the coils 325--9 to 0 will be energized to open the related 12 contacts in the main circuit of coil R-2'I. Coil 325 also closes related contacts 325a to close the circuit through the associated holding coil 325' as follows (Fig. 191)) Holding coil-325' circuit,From the right side;

through the coil 325', contacts 325a, one of the contacts 26 (see also Fig. 6) of the recording unit, through the normally closed right side of transfer contacts R-Iib, hand switch 326, and to the left side.

The energized holding coil 325' holds contacts 325a closed and 325b of the double coil relay-open after the related pick-up coil 325 is deenergized by breaking of the analyzing circuit at about 24 of the zoning cycle. Thus, with contacts 325a maintained closed, the above holding coil circuit can be opened only by opening of the contacts 26 therein. Contacts R-Bb are controlled by the coil -R6, which is energized only upon analysis of an alphabetic character code, as previously explained. Thus, during analysis of digit designations 0 to 9 the right side of contacts lit-6b remains closed.

Each pair of contacts 26 is controlled by a cam I2 (see Fig. 6). As explained in the description of the zoning system, operation of a lever I0 unlatches a cam I2 for co-action with power shaft I4, and the shaft rocks the cam to cause the character corresponding to the operated lever I0 to be recorded. As cam I2 is rocked by shaft I4, it momentarily opens the related pair of contacts 26. If the zoning and recording means accurately transcribes the analyzed code, the cam I2 associated with the contacts 26 in the circuit of the energized holding coil 325' operates and opens the contacts as an incident to the correct recording operation. Accordingly, coil 325' will be deenergized, permitting its contacts 325b to. reclose. The analyzing circuits formed under control of a code in a card column cause the release of one zoning lever 2I8 (Figs. 7 and 8) for operation by lift bail 22I (see also Figs. 6, 10, and 13). The lift bail elevates the released lever 2! at 50 of the zoning cycle (see Fig. 17), causing operation of the connected lever III to release the associated cam I2 for turning by shaft I4. At about 53 of the zoning cycle, the cam I2 has opened related contacts 26, and if the correct 32% to reclose, reestablishing the main circuit of coil R-Z'I before the commutator HS-G breaks at 55 to open the stick circuit of the coil. Coil R-2I, therefore, remains energized to'keep its contacts R-2I'b of the main clutch magnet circuit closed, so that the card feed continues uninterruptedly.

If the analyzed code has not been accurately transcribed, the wrong cam I2 will operate, and the contacts 26 in the previously formed circuit of the holding coil 325' will not open. Coil 325', therefore, will remain energized and hold its contacts 325D in the main circuit of coil R21 open, and when commutator HS6 breaks at 55, coil R-2'I will be deenergized, causing contacts R-2'Ib to open and break the main clutch magnet circuit. The main clutch will then disengage at "80 of the zoning cycle, interrupting card feed as a manifestation or indication of an inaccurate transcription.

As a specific example of the operation of the checking means, assume the digit8 code is in the card column at the analyzing station. Analysis of the 8 hole results in energization of pickup coil 3258 and parallel comb magnet 2I2-8.

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