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Title:
Apparatus for sensing tabulating cards and the like
United States Patent 2416625
Abstract:
This invention relates to apparatus for sensing tabulating cards, more particularly to control devices for card-punching and card-sorting apparatus, and tabulating or accounting machines. An object of the present invention is to provide an electrical control device which is sufficiently responsive...


Inventors:
Hooper, John W.
Publication Date:
02/25/1947
Assignee:
AMERICAN MACH & FOUNDRY
Primary Class:
Other Classes:
101/93.44, 234/75, 235/61PM, 235/434
International Classes:
G06K7/08
View Patent Images:
Foreign References:
CH210291A
Description:

This invention relates to apparatus for sensing tabulating cards, more particularly to control devices for card-punching and card-sorting apparatus, and tabulating or accounting machines.

An object of the present invention is to provide an electrical control device which is sufficiently responsive to pencil marks on a card or' other record to operate card-punching and card-sorting mechanisms, or the printing mechanism of accounting or tabulating machines. There have been prior electrical control devices for this purpose which relied upon brushes or other instrumentalities which contacted pencil marks or other electrically conductive indicia to operate the record-controlled mechanisms. However the contact required with the pencil marks tends to obliterate them, and a considerable percentage of inaccuracy, due to improper response to the pencil marks or indicia, has been characteristic of the prior control devices.

With these and other objects in mind there is provided an electrical control device which responds without physical contact with the pencil marks to operate the controlling mechanism of the card-sorting or card-punching apparatus. To this end there is provided a high frequency oscillatory electrical circuit connected to pick-up elements whose capacitative coupling is sufficiently varied by the proximity of pencil marks on a card to energize solenoids or other elements which set the card-punching or card-sorting mechanism, or the printing mechanism of the accounting machine, into operation.

The control device may be applied to other forms of record-controlled apparatus, and the constructions exemplified herein may be modified to suit the particular apparatus to which they may be applied.

In the accompanying drawings, which form a part of this specification and in which like characters of reference indicate the same or like parts: Fig. 1 is a perspective view of the invention as embodied in a card punching apparatus; Fig. 2 is a detail view of a portion of the clutch mechanism thereof and the control for the "micro" switch; Fig. 3 is a detail sectional view of one of the pick-up elements or condensers which senses the pencil marks on the record cards; Fig. 4 is a detail view of one of the punches; Fig. 5 is a wiring diagram of the oscillator and amplifier circuits which is suitable for the card punching apparatus, the card sorting apparatus, or the printing mechanism of the accounting machine; Fig. 6 is a perspective view of a card-sorting apparatus exemplifying the invention; and Fig. 7 is a sectional elevation showing somewhat diagrammatically the control mechanism for the printer mechanism of a tabulating or accounting machine embodying the invention.

Referring to Figs. 1-4, which illustrate one form of construction suitable for a card punching machine, the record card I has vertical columns of numerals running from 1 to 0; and certain numerals may have been marked with a pencil as depicted in Fig. 1. The record card I is advanced lengthwise; and the card 3 to be punched, which is of a size similar to card I and similarly printed with vertical rows of numerals, is simultaneously advanced by mechanism which will now be described.

The pusher 5 carries a rack 7 whose teeth mesh with a gear 8 fastened on a shaft 9 one end of which is supported in a bearing II (Fig. 2), which may be attached to the table 12, and a bearing (not shown) at the other end thereof. The pusher 5 engages one end of the card, and the pusher 13 engages the corresponding end of the card 3 which is aligned with card I. Pusher 13 carries a rack 15 which meshes with a gear 17 fastened on shaft 9. On the end of shaft 9 projecting from gear 8 is fastened one member 20 of a jaw clutch whose other member 22 is slidably mounted on shaft 9 and urged away from driving position by the compression spring 24.

The member 22 is provided with a knurled knob 25 which may be grasped to push the member 22 into engagement with member 20 and then turned to rotate shaft 9 and advance pushers 5 and 13. A spring pawl 26 fastened to table 12 engages a pinion 27 fastened on shaft 9, and when the shaft 9 is turned sufficiently to advance the next tooth on pinion 27 into engagement with pawl 26, the pushers 5 and 13 advance the cards I and 3 a distance equivalent to the space between the centers of successive columns of numerals on the cards. Thus the cards I and 3 will be simultaneously advanced to present successive rows of numerals on cards I and 3 for sensing and punching.

Whenever a pencil mark on one of the rows of numerals on card I is advanced-under one of the sensing condensers 28, 30 and 32, a punch will be actuated to punch a hole in a corresponding part of card 3, by mechanism hereinafter described. Each of the condensers 30 and 32 is mounted in a metal support bar 34 extending above the path of card i, and may be similar to condenser 28 which is also supported in bar 34 and whose detailed construction is shown in Fig. 3.

Referring to Fig. 3, the sensing condenser 28 consists of an annular shield 38 mounted within an annular pick-up electrode 38 and insulated therefrom by insulator ring 40 formed of suitable insulating material such as hard rubber. The electrode 38 is insulated from bar 34 by another ring 42. An output electrode 44 is positioned within the shield 36 and insulated therefrom by a ring of insulating material 45, and connected by a shielded conductor or cable 46 to an oscillator circuit enclosed in the box 48 (Fig. 1). The electrode 38 is connected by a shielded conductor or cable 50 to a resonator consisting of a coil 403 and its tuning condenser (Fig. 5) enclosed in the box 52 (Fig. 1), and the coil 403 being coupled to an amplifier circuit connected to a relay 90, the amplifier circuit and relay being also enclosed in box 52. The connections to and functions of electrodes 33 and 44 may be interchanged without any change in principle of operation.

The output electrode 54 of condenser 30 is mounted within the annular shield 55 and insulated therefrom in the same manner as in condenser 28, and the output electrode 56 of condenser 32 is mounted within the annular shield 57 and similarly insulated therefrom. Electrodes 54 and 56 are respectively connected by the shielded conductors 58 and 60, to the conductor 46. The pick-up electrodes 62 and 64 of condensers 30 and 32 respectively, which correspond to the electrode 38 of condenser 28, are connected by the shielded conductors 68 and 68 respectively, to separate resonators coupled to amplifiers connected to relays, the resonators, amplifiers and relays being enclosed in the boxes 52a and 52b. The shield 36 and the shields 55 and 57 are connected to bar 34 by leads S8, 77 and 1i, respectively, and bar 34 is grounded at 79.

Whenever the knob 25 is thrust inwardly to engage the clutch member 22 with clutch member 20, a yoke 83 engaging an annular groove 84 in clutch member 22 and fastened on one end of a shaft 85 carried by a pedestal 86 attached to table 12, is swung inwardly to cause the arm 87 on the other end of shaft 85 to release the trip pin 88 of the "micro" switch 89. The switch 89 is of well known construction, and when the pin 89 is released by the described movement of arm ST, the switch is capable of conducting electricity from the lead 90, which is connected to one of its terminals 91, to the lead 93 which is connected to the other terminal 92 of switch 89. The lead 90 is connected to a suitable source of D. C. current indicated in Fig. 1 as a battery 94. A lead 95 from the battery 94 is connected to one of the outlet terminals of the secondary circuit of a relay 9S (Fig. 5) whereby upon energization of the winding of the relay 98, when a pencil mark on the card I passes under any of the condensers 28, 30 or 32, the armature 97 of said relay will be attracted to the core of said relay and establish a circuit from lead 95 to the other outlet terminal of the secondary circuit, to which the lead 98 is connected. The lead 98 is also connected to one end of the coil of a solenoid 99, which is mounted in a support bar 101 (Fig. 4), and the lead 93 is connected to the other end of the solenoid coil whereby when the circuit is completed from lead 95 to lead 98 upon energization of the relay 96, the core 100 of solenoid 99 will be displaced downwardly. A punch 102 fastened to the lower end of the core 100 is normally held in its upper position by the compression spring 104, and guided in a hole of a bar 105 which extends across the card 3. Thus when solenoid 99 is energized the punch 102 is depressed into the die M86 underlying the card 3 and a hole is punched in the latter through a numeral corresponding to the numeral bearing a pencil mark on card i, positioned under condenser 28.

The wires 95a and 95b from lead 95 are similarly connected to relays (not shown) of amplifier circuits enclosed in the boxes 52a and 52b respectively, said relays being similar to relay 96 described above and being connected by leads 107 and 809, respectively, to the windings of solenoids 111 and 113, respectively, which may also be supported in bar 101. Wires 93a and 93b from lead 93 are connected to the windings of solenoids Il and 113, which are equipped with springs similar to spring 194 and engaging the heads of the cores I 12 and 114, so that they may be energized to cause their respective punches 115 and 1 7 to punch holes through numerals in card 3 corresponding to numerals on card I bearing pencil marks, when sensed by the condensers 30 and 32. Upon releasing the knob 25 the circuits Bstablished through the various solenoids will be broken, and the spring 104, and the springs on cores 112 and 114 will return the punches to their upper positions, so that the card 3 may be further advanced simultaneously with card 1.

The oscillator circuit which will now be described, referring to the wiring diagram shown in Fig. 5, includes plug 140, shown outside of the box 48 in Fig. 1, so that the circuit may be connected to A. C. current by inserting plug 140 into the outlet of an A. C. line. The plug 140 is connected to the primary coil or winding of a transformer 142 whose secondary coil 143 is connected to the plates or anodes of a full wave rectifier tube 144 of any suitable type such as 5T4, and the cathode of the latter is connected to the secondary winding 145 of transformer 142. The primary coil of the transformer is connected to a fixed condenser 147 which is grounded at 148 to remove radio frequency currents and line noises.

The output of the rectifier 144 is delivered through a center tap 150 from coil 145 through a filter consisting of a choke-coil 160 and a grounded condenser ISE to a voltage divider 162, and also through an adjustable tap resistor 163 to the anode of a voltage regulator diode tube 164 of any suitable type, such as VR105/30. The voltage divider 162 includes a grounded resistor 165 and a resistor 66 receiving the output of the filter and is connected through a resistor 167 shunted across a milliammeter 168 to a coil 169 which is tuned by the variable condenser 170 connected across the ends of coil 169. The coil 169 is inductively coupled with a coil 171, which is tuned by a variable condenser 172, and connected through a fixed condenser 173 to the shielded conductor or low loss cable 46 leading to the output electrode 44. Coil 169 is connected to the plate 174 of a triple-grid oscillator tube 175 of any suitable type, such as 6SJ7. The anode of tube 164 and the variable contact point of resistor 183 are connected to the screen grid 176 of the tube 175. The cathode 178 of tube 175 has a heater 179 which is connected to the secondary heater winding 180 of transformer 142. Cathode 118 is connected to the suppressor grid 181. The current flowing from the plate 174 to the cathode 178 is conducted by a tap 184 to a coil 185, which is grounded at 186 and tuned by the variable condenser 187, the coil 185 being connected through the grid leak 188 and a grid condenser 188a to the control grid 189 of tube 175. Condenser 176a g connecting the screen grid 176 to ground 186 and condenser 174a connected from coil 1i9 to ground, respectively by-pass the R. F. currents to the screen grid and plate of tube 175.

The oscillator circuit shown is of the Hartley type and generates a high frequency current of about 175 kilocycles which is impressed upon the coil 1S9, thereby inducing a current of similar frequency in the coil 171 which is conducted to the electrode 44. The oscillator circuit may be tuned by adjusting the condensers 187, 172 and 170. The annular pick-up electrode 38 is shielded from the central output electrode 44 by the concentric grounded shield 30. When a mark made by a soft graphite pencil on dry paper is brought into close proximity with the electrodes it increases the coupling between the output and pickup electrodes. The mark can be considered as a common plate of three condensers. The condenser formed by the mark and the output electrode 44 is connected in series with the condenser between the mark and the grounded shield 36 through the resistance of the linking part of the mark, and forms a voltage divider. The pick-up electrode 38 is coupled to the mid-point of this 3g divider by the capacity between electrode 38 and the mark, and the resistance of the mark. If the distance between the mark and shield 36 is made greater than that between the mark and the electrodes, a greater proportion of the oscillator output is coupled to the pick-up electrode, but the "residual" coupling between the electrodes, without a mark in front is also increased. The best condition for the greatest change in coupling (which is the desired objective) depends somewhat on the proximity and conductivity of the mark, but it was found that the best average results were obtained with the faces of electrodes and shield approximately flush.

The pick-up electrode 38 is connected to a resonant circuit, consisting of a coil 403 and parallel tuning condenser, through shielded cable 50 and condenser 401 of relatively large capacity.

The resonant circuit is tuned to the frequency of the oscillator in order to give it maximum impedance, so that a small change in coupling between the electrodes will cause the greatest possible change in impressed voltage across coil 403.

The coil 403 is part of the amplifier unit which is enclosed in case 52. This unit contains a power rectifier, a two-stage R. F. amplifier, diode detector, and two-stage D. C. amplifier connected to a relay. The power rectifier is of conventional design, consisting of a transformer T-1 having a primary winding 455 and secondary winding 00 463 grounded at 464 and connected to the anodes 461 of a full-wave rectifier tube 459. The primary 455 is connected to condensers 469 and ground 467 and to a plug 455 shown outside of case 52 in Fig. 1. The cathode 457 of tube 459 is connected to a secondary winding 453 of transformer T' and the output delivered by the center tap 451 is filtered by swinging choke 443 and condenser 445 connected to ground 447. Transformer T' also has a secondary 550 which is connected to the heaters of the cathodes of the various tubes.

Voltage regulating tube 435 is connected to an adjustable tap on resistor 441 and shunted by a small condenser 429a to by-pass R. F. currents.

Resistor 441 is connected to ground 437. The two-stage R. F. amplifier is also of conventional design. The coil 403 is the primary winding of a tuned R. F. transformer T2, the secondary winding 405 of which is connected to the control grid 407 of the first R. F. amplifier tube 409, which may be a triple grid tube like type 6SK7, and also through condenser 471 to the cathode 470 which is connected to suppressor grid 421. The first stage is coupled to the second by another tuned R. F. transformer T3 having a tuned primary winding 413 connected to the plate 411 of tube 409 and a tuned secondary winding 415 connected to the control grid 417 of a tube 419 similar to tube 409. The second stage is similar to the first, and the cathode 476 of tube 419 is connected to the suppressor grid 423. Both stages are self-biased and the amount of bias of both is controlled by one cathode rheostat 473 which is connected to ground 474 and resistors 472 and 480. This amount of bias in turn determines the amount of amplification. The screen grids 482 and 484 of the two tubes 409 and 419 are supplied from the V. R. tube 435 through wire 433 and separate filters 425-427 and 429-431. The plates 411 and 486 are supplied from the full output of the power rectifier through wire 498 and separate R. C. filters 492-493 and 496-497.

A third tuned R. F. transformer T4, which consists of a tuned primary winding 49~ and tuned secondary 499, follows the second R. F. stage and the output of this transformer is rectified by double diode 500 having pairs of anodes 504 and cathodes 501, and used as a half-wave rectifier.

The rectified output voltage appears across condenser 510 and leakage resistor 505 which are connected to ground 512. This voltage is filtered by a tuned coil 500 and condenser 508 to eliminate every trace of R. F. and the output is impressed on grid 516 of the first D. C. amplifier tube 518. The cathode return of the diode 500 and the leakage resistor 505 are connected to the movable contact of potentiometer 502 connected across the V. R. tube 435, to control the steady bias of tube 518. The potentiometer is connected to a ground 503 which is connected through a by-pass condenser to the cathodes of tube 500.

The plate of tube 518 is supplied from the voltage regulator tube 435 through wires 433 and 429, resistor 524 and neon glow lamp 522. A milliammeter 520 is connected between the cathode of tube 518 and ground. Potentiometer 502 is adjusted so that, without any mark in front of the pick-up electrodes, the plate current of tube 516 is just sufficient to maintain a steady glow of lamp 522.

When a pencil mark passes in front of the pick-up electrodes, the R. F. voltage across coil 403 increases. Consequently the D. C. voltage across condenser 508 increases, and its polarity is such that grid 516 becomes more negative.

This reduces the plate current of tube 518 and as this current was only barely sufficient to maintain a steady arc in lamp 522, this lamp is now practically extinguished, the current through resistor 524 is sharply reduced and the grid of tube 526, connected to this resistor, becomes more positive.

The tube 526 is connected across the upper part of voltage divider 441. Its plate is connected to wire 498 through the magnet coil of relay 86 by wires 530 and 532, shunted by a condenser 534.

Its cathode is connected to wire 429 through biasing resistor 528 also shunted by a condenser. The normal drop across resistor 524 is sufficient to block the plate current in tube 526 completely, but when the arc in lamp 522 is extinguished by the passage Of a pencil mark in front of the pick-up electrodes the grid bias of tube 526 is suddenly reduced to the drop across resistor 528 and the plate current becomes sufficient to energize relay 96 and close the contact from wire 95 to 98. Condenser 534 prevents too rapid a release of relay 96.

The resonator, the amplifier circuit and the relay circuit just described correspond to those enclosed in box 52, but it will be understood that those within boxes 52a and 52b are similar.

In the card-sorting apparatus shown in Fig. 6, a record card 200 bears rows of numerals, any one of which may be marked with a pencil, is advanced sidewise by a pusher 202 along a table 204, which may be formed of non-conductive material such as wood, under a sensing condenser 206 slidably mounted in a slot 208 of a metal bar 210 extending across the table. The pusher 202 may be operated by mechanism similar to that shown in Fig. 1 for operating the pusher 5 thereof. The condenser 206 has a base 212 slidably mounted on bar 210 and provided with flanges which project downwardly at the sides of bar 210, and one of said flanges is provided with a pointer 214 for indicating the particular row of numerals over which the condenser is positioned. The construction of the condenser 206 is similar to that of the condenser shown in Fig. 3, and its outer electrode 215 is similarly insulated from base 212 and from the shield 216. A shielded conductor 220 connects the electrode 222 mounted within the shield 216 and suitably insulated therefrom to the oscillator circuit which is similar to that shown in Fig. 5 and enclosed in the box 224. Thus when a pencil mark on any of the numerals of the particular row over which condenser 200 is positioned passes under the latter, an electrical impulse is transmitted to an amplifier circuit which thereupon energizes a card deflector to drop the advancing card into a card box, as hereinafter described. The electrode 215 is connected by the shielded conductor 226 to the contact maker 227 of the switch 228. A lead 230 connects the shield 216 to the base 210, which is formed of a conductive material such as metal and connected by a wire 232 to a ground 234, thereby grounding the shield 216.

The terminals 236 of switch 228 are connected by shielded conductors 240a, 240b and 240c to separate amplifier circuits enclosed in the boxes 242, 242a and 242b, each of these amplifier circuits being similar to the amplifier circuit shown in Fig. 5.

Leads 246, 247 and 243 are connected to one of the outlet terminals of the secondary circuits of relays (not shown) whose primary circuits are connected in the amplifier circuits within boxes 242, 242a and 242b, which are similar to the amplifier circuit shown in Fig. 5. The leads 246, 247 and 248 are also connected to one end of the windings of solenoids 250, 251 and 252. A suitable source of D. C. current such as the battery 254, is connected in parallel with the other outlet terminals of the relays of the separate amplifier circuits and to the other ends of the windings of the solenoids 250, 251, and 252, the line 256 from the battery to the solenoids being preferably connected in series to a "micro" switch (not shown) similar to that of Figs. 1 and 2 and similarly controlled by mechanism operated from the shaft which controls the movement of pusher 202.

Thus upon moving the contact maker 227 to one of the terminals of switch 228 the corresponding solenoid 250, 251 or 252 will be energized if a pencil mark on card 200 is advanced underneath condenser 206, and the corresponding deflectof 276 will be swung upwardly to permit the card 200 to drop into the desired box 278, as it is advanced by mechanism hereinafter described. Upon shifting the condenser 206 along the bar 210 to overlie any desired column of numerals, any cards having pencil marks on any of the numerals in that column will be diverted to one of the boxes 278 as they are advanced by mechanism which will now be described. Normally the solenoid cores are maintained in an ineffective position by their springs 258, 250 and 260, but when any solenoid is energized its core depresses the underlying finger 272 mounted on one of the shafts 274 and swings the card deflectors 276 mounted thereon into an upwardlyinclinedposition,so that the card may drop into the underlying card-box 278, each of which may be provided with a yieldingly mounted bottom 280. As the card 200 is advanced along the table 204 by pusher 202, it engages the driven rollers 282 which coact to advance the card across the first set of deflectors 276 to the sets of rollers 283 and 284 which advance the card across the remaining card deflectors. The rollers 283 are loosely mounted on shafts 274 and rollers 284 are carried by the driven shafts 285. Further description of the details of the card-sorting apparatus is deemed unnecessary, as reference may be had to the patent to W. W. Lasker, No. 1,315,370, issued September 9, 1919, for the details thereof. However, each of the shafts 274 may be provided with a finger 287 engaging a spring-pressed pivoted latch 289. When a deflector is tilted upwardly the corresponding latch 289 engages behind the finger 287 and maintains the deflector in its upwardly tilted card-diverting position until the slide-bar 291 is manually displaced rearwardly, after the corresponding solenoid is deenergized, to swing the latch downwardly to permit the finger to return to initial position above the latch.

Referring to Fig. 7, wherein the invention is illustrated conjunction with an accounting or tabulating machine of the type shown in Patent 2,291,970, issued August 4, 1942, to H. NeumannLezius, the printing unit is one of a plurality of parallel units, each of which includes a type carrier 301 slidably carrying successive types 302 for printing numerical, alphabetical and other de60 sired indications. Each type carrier is rockably mounted on a shaft 303 and provided with a rear arm 304 urged by a spring 305 against a bail 306 carried by arms 307 which are also rockably mounted on shaft 303. Rigid with one of the arms 307 is a gear 308 meshed with a sector 309 following a cam groove 309' in a cam wheel 310.

The cam wheel makes one revolution each machine or card cycle and during the greater part of this cycle, the cam groove 309' rocks sector 309 counterclockwise while during the remainder of the cycle, the sector 309 is restored in a clockwise direction. During the counterclockwise or forward stroke of sector 309, it rocks bail 306-7 clockwise which, through spring 305, advances the type sector impositively in the same direction throughout its type-selecting range. The advance of the type carrier is selectively arrested at a differential point of the type-selecting range under control of an indication on the record card, in a manner which will be explained later. When arrested at the selected point of its range, the carrier is positioned with the type corresponding to the indication at a printing position in which the back of the type is opposite the nose of a hammer 313. The hammer has a lug 312 engaged by a bar 311 which is rocked out of the way of the lug during the portion of the cycle in which cam groove 309' permits sector 309 to idle before starting its return stroke. As the bar 3 1 releases lug 312, a spring 314 drives the hammer against the selected type to cause the type to print, through an ink ribbon 31, on a sheet carried and fed by the platen roll 315 in a known manner.

As also known in the art, hammers 313 of those type carriers which have not been set for a type selection during the cycle are prevented from needlessly operating by engagement of lugs 317 of the type carriers with projections 318 of the hammers. Restoration of the hammers is effected in a suitable known manner.

Associated with each type segment 301 is an arm 319 having twelve teeth 320 marked 9 to 0, 11, and 12. The record card TC has twelve index positions 9 to 0, 11 and 12 which pass the sensing means in synchronism with the travel of the correspondingly designated teeth 320 past the nose 325 of a pawl 321. For convenience, the pawl 221 and the teeth 320 may be considered as the primary stop contrivance for the type carrier of which the coacting parts move with respect to each other in synchronism with the passage of successive index positions of the card through the sensing means. The sensing means comprises condensers C similar to the condenser shown in Fig. 3 and similarly connected to oscillator and amplifier circuits (not shown). One condenser is provided for each column. The index positions 9, 8, 7 . . . 1, 0, 11, and 12, pass in order, through the sensing means and when a condenser detects a pencil mark on a numeral in an index position, a circuit is momentarily closed through a solenoid 329. Separate solenoids 329 are connected to the secondary contacts of relays connected in the amplifier circuit of each condenser C, so that each solenoid 329 will be energized upon detection of a pencil mark in its corresponding column. One card is acted on each cycle and its index positions 9, 8, 7 . . . 1, 0, 11, and 12 pass in order through the sensing means in synchronism with the travel of the corresponding teeth 320 past the nose 325 of pawl 321. The actuating means for the type carrier idles after the last or "12" index position passes the sensing brush SB and during this idlng period, the printing operation occurs, following which the type carrier is restored. A single pencil mark in an index position of a card column may be employed, as is customary, to designate a, digit while combinations of pencil marks in a column may be used to represent alphabetic characters, punctuation marks, and other desired symbols.

The present invention permits the use of a pair of pencil marks in any two index positions of a card column to represent a character or sign.

Thus, a "9" pencil mark maybe combined with any other pencil mark in the column to represent, in codal form, a desired indication. Merely by way of example, it is preferred in the present instance to represent the various indications by pairing a pencil mark in one of the index positions 9 to 4 of a column with a pencil mark in one of the positions 3. 2. 1, 0, 11 and 12 of the column. It is to be understood, however, that where a greater number of indications are to be designated, the index positions may be paired in all possible combinations. As the card passes the sensing means, one or more pencil marks in a column are sensed to cause energization of solenoid 329. The single or repeat energization of the solenoid during a cycle causes the advance of the type carrier to be arrested, with the type corresponding to the sensed indication at printing position. The first energization of the solenoid results in the parts 320 and 321 of the primary stop contrivance engaging each other to effect a primary interruption in the advance of the type carrier, at which point the type which may be designated by the first perforation will be in printing position. The second or repeat energization of the solenoid acts through a secondary stop contrivance, comprising parts 335 and 336, to stop a supplementary advance of the type carrier, at the end of which the type for printing the indication represented by a pair of pencil marks in a column is at the printing position.

The manner in which the stop contrivances are operated will now be explained in detail. Pawl 321 is in the form of a bell crank lever pivoted on a stud 322 carried by a slide 323. There is one slide 323 for each of the parallel printing units and a guide block 324 with suitable ways is provided for slidably mounting the slides. The lower arm of each pawl 321 is formed as an inclined nose 326, the abrupt side of which is initially engaged by the upper leg of the Tshaped nose of a latch lever 327. The latch lever is maintained by a spring 328 in engagement with a projection of a lever 331 which is connected by a linkage 330 to the plunger 329' of solenoid 329. Upon detection by a condenser of the first pencil mark in a card column, solenoid 329 is energized for the first time during the card cycle to cause lever 331 to rock clockwise. This, in turn. causes counterclockwise movement of the latch lever 327, withdrawing the upper leg of its T-shaped nose from the nose 326 of pawl 321 and placing the lower leg of the T-shaped nose in front of a projection 333. The release of pawl 321 permits a spring 332 to rock the nose 325 upwardly to engage that one of the teeth 320 which corresponds to the sensed index position and which is then immediately to the right of the nose 325. The engagement of this tooth with the pawl nose 325 couples the pawl and its carrying slide 323 to the type carrier for common advance therewith. However, as the lower leg of the T-shaped nose of lever 327 now is in front of the projection 333 of the slide, it stops the slide and, thereby, the coupled type carrier, after the slide has moved just far enough to bring the lower nose 326 of pawl 321 ahead of the T-shaped nose of lever 327. When sensing is completed, solenoid 329 is deenergized. causing latch lever 327 to return clockwise and bring the upper leg of its T-shaped nose in front of a second projection 334 of the slide 323, thereby stopping advance of the slide and the coupled type carrier in a primary position corresponding to the first sensed pencil mark of the card column. Such pencil mark may be the only one in the column and may designate a desired indication, in which event, the type carrier will have been arrested with the type for printing this indication located at the printing position.

Assuming that a second pencil mark occurs in the card column, the sensing of this perforation causes a repeat energization of solenoid 329, which results in the lowering and withdrawal of the upper leg of the T-shaped nose of lever 327 from projection 334 of slide 323. This frees the slide and type carrier for common movement during which the type carrier performs a supplementary advance. The extent of this supplementary advance is determined by the coaction of the parts 335 and 336 of the secondary contrivance. The second pencil mark in a card column cannot occur in the "9" index position which is the first one encountering the sensing means. Thus, theoretically, there may be one step 335 for each of the index positions 8, 7 . . . 0, 11, and 12.

However, for the present example, it has been assumed that the second pencil mark is to occur only at one of the index positions, 3, 2, 1, 0, 11, and 12; hence, one step 335 is shown for each of these index positions. The steps are progressively distant from the nose of stop 336, and the stop is moved progressively upward into the path of the successive steps 3, 2, 1, 0, 11, and 12 in synchronism with the passage of the corresponding index positions 3, 2, 1, 0, 11 and 12 through the sensing means. Thus, if the second pencil mark is sensed in one of the latter index positions, the repeat operation of latch lever 327 releases the slide 323 for. advance at the time the nose of stop 336 is in front of the corresponding step 335. The stop is engaged by this selected step to interrupt advance of the slide, and, thereby, to arrest the supplementary advance of the coupled type carrier at a point of its type selecting range at which the type, corresponding to the indication denoted by the pair of sensed pencil marks in the card column, is located at the printing position. Thus, different combinations of primary and secondary advances of the type carrier are provided to effect selection of types for printing.

The stop 336 is slidably mounted in a socket in the free end of the pivoted arm 338 and surrounded by a spring 339 which urges the stop to maintain normal upper position on the arm until arrested by the bottom of a step 335, after which the arm 338 may continue to move while the stop remains stationary. Arm 338 has a follower roller 340 riding in a cam groove 341 of the cam wheel 310. In the present example, the cam groove is shaped to allow arm 338 to remain idle while the index positions 9 to 4 are passing the analyzing means. The cam groove then progressively rnises arm 338 in front of the successive steps 335 in synchronism with the passage of index positions 3, 2, 1, 0, 11 and 12 through the sensing means. The sensing of the second pencil mark in one of these index positions releases the slide for advance with the type carrier until arrested by engagement of stop 336 with the step 335 then in front of the stop and corresponding to the second pencil mark position. The stop then remains at rest while cam groove 341 continues to raise arm 338 until the "12" index position of the card passes the sensing means.

The arm 338 then idles while the printing operation occurs, after which the arm is restored, together with the stop 336, by the cam groove 341.

After the printing operation, sector 309 is restored by cam groove 309', causing restoration of the printing unit. As the unit returns, teeth 320 ratchet past nose 325 of pawl 321 and, finally, a lug 337 of the arm 319 engages the front, inclined edge of the nose 325 and cams the pawl 321 counterclockwise into normal release position until the front face of the lug and the confronting edge of the pawl nose are in flush engagement. Thereafter, the return travel of the type sector is communicated, through lug 337 and pawl nose 325, to slide 323. As the slide completes its return travel, noses 334 and 333 thereof and nose 326 of pawl 321 successively cam past the nose of latch lever 327 which, at the end of the return stroke of the printing unit is in normal engaged position with respect to the nose 328 of the pawl 32f, thereby holding slide 323 in initial position.

It is noted that one of the main advantages and objects of the invention is to perform tabulating operations direct from original pencilled or otherwise marked data on the cards, thus eliminating hand or automatically controlled punching, or both. It is noted that since the present device, unlike contacting brushes, senses the marks without physical contact and wear on the same, the same mark may be run past the sensing devices over and over again without loss of substance and distinctness.

In the foregoing disclosure, the mechanisms illustrated and described should be understood as being for purposes of illustration of the invention, and the invention therefore should not be restricted to the details shown and described.

For example, in Fig. 1 of the drawings three sensing devices are shown for purposes of simplicity. It is, of course, understood that there can be provided, and in the normal course of events would be provided, one sensing device for each row of figures, that is ten sensing devices for the card illustrated, though under some circumstances this number might not be necessary.

Likewise in the form illustrated in Fig. 6, instead of picking out cards having a number marked in one row, it can be understood that a sensing condenser might be required for each row of figures, and similarly one switching device and pocket might be provided for each figure from "0" to "9." The terms and illustrations which I have employed are used as terms of description and not of limitation and I have no intention in the use of such terms and expressions of excluding equivalents of the features shown and described, but recognize that various modifications are possible within the scope of the invention claimed.

What is claimed is: 1. In a record controlled apparatus, the combination with a condenser having a pair of electrodes whose capacitative coupling is varied by the proximity of a graphite pencil mark on a record, of a circuit connected to one of said electrodes, means for impressing a high frequency electric current on said circuit whereby the capacitative coupling of said electrodes is increased by the proximity of a graphite pencil mark on a record, an amplifier unit connected to the other of said electrodes and responsive to a variation in the capacitative coupling of said electrodes created by the proximity of a graphite pencil mark on a record, and an electrically operated control device connected to the said amplifier unit and adapted to be operated when said amplifier unit responds to a variation in the capacitative coupling of said electrodes created by proximity of a graphite pencil mark on a record, said condenser electrodes having a cylindrical shape and being of different diameters and the smaller electrode being arranged within the larger electrode.

2. In a record controlled apparatus, the combination with a condenser having a pair of electrodes whose capacitative coupling is varied by the proximity of a graphite pencil mark on a record, of a circuit connected to one of said electrodes, means for impressing a high frequency electric current on said circuit, an amplifier unit connected to the other of said electrodes and responsive to a variation in the capacitative coupling of said electrodes created by the proximity of a graphite pencil mark on a record, and an electrically operated control device connected to the said amplifier unit and adapted to be operated when said amplifier unit responds to a variation in the capacitative coupling of said electrodes created by proximity of a graphite pencil mark on a record, said condenser electrodes having a cylindrical shape and being of different diameters and the smaller electrode being arranged within the larger electrode, the ends of said electrodes which are adjacent the pencil mark being flush with each other.

3. In a record controlled apparatus, the combination with a condenser having a pair of electrodes whose capacitative coupling is varied by the proximity of a graphite pencil mark on a record, of a circuit connected to one of said electrodes, means for impressing a high frequency electric current on said circuit, an amplifier unit connected to the other of said electrodes and responsive to a variation in the capacitative coupling of said electrodes created by the proximity of a graphite pencil mark on a record, and an electrically operated control device connected to the said amplifier unit and adapted to be operated when said amplifier unit responds to a variation in the capacitative coupling of said electrodes created by proximity of a graphite pencil mark on a record, said condenser electrodes having a cylindrical shape and being of different diameters and the smaller electrode being arranged within the larger electrode, the ends of said electrodes which are adjacent the pencil mark being flush with each other, and a grounded shield interposed between said electrodes, the end of said shield which is adjacent the pencil mark being flush with the adjoining ends of the electrodes.

JOHN W. HOOPER.

REFERENCES CITED 10 The following references are of record in the file of this patent: UNITED STATES PATENTS Number 15 1,985,035 2,357,860 1,741,992 2,123,812 2,285,152 20 2,254,932 1,855,569 1,905,332 1,962,732 2,294,681 25 2,294,751 1,982,216 Number 30 210,291 Name Date Kermode et al. .---- Dec. 18, 1934 Whitaker -------_ Sept. 12, 1944 Kleckler -------_ Dec. 31, 1929 Stevens et al. ------ July 12, 1938 Firestone ----------. June 2, 1942 Bryce ------------- Sept. 2, 1941 Chireix __________ Apr. 26, 1932 Barbulesco -------_ Apr. 25, 1933 Bryce et al. ------_ _ June 12, 1934 Moon --________-- Sept. 1, 1942 Harrison et al. -____ Sept. 1, 1942 Lowkrantz __-------_ Nov. 27, 1934 FOREIGN PATENTS Country Date Swiss -------------- Sept. 16, 1940