US2800182A - Perforating machine - Google Patents

Description

y 1957 F. E. HAMILTON ETAL 2,800,182

PERFORATING MACHINE Filed Nov. 18, 1954 5 Sheets-Sheet i INVENTORS' FRANCIS E. HAMILTON EDG AR ALAN BROWN CHARLES C ZULEEG ATTORNEY NAU m: mm 3: m:

July 23, .1957 F. E. HAMILTON ETAL 2,800,182

' PERFORMING MACHINE A Filed Nov. 18,- 1954 I 5 Sheets-Sheet 2 INVENTORS FRANCIS E. HAMILTON BY EDGAR ALAN BROWN CHARLES c. zu

ATTORNEY y 23,1957 v F. E. HAMILTON ETAL 2,800,182

7 I PERFORMING MACHINE Filed Nov. 18, 1954' 5 Sheets-Sheet 3 FIG. 3.

INVENTORS FRANCIS E. HAMILTON By EDGAR ALAN BROWN CHARLES c.2u E5 ATTORN'EY g July 23, 1 57 F. E. HAMILTON EI'AL 2, 0 ,182

PERFORATING MACHINE 5 Sheets-Sheet 4 Filed Nov. 18, 1954 INVENTORS FRANCIS E. HAMILTON EDGAR ALAN BROWN Y m E N R C O s w & A R. A H c July 23, 1957 F. E. HAMILTON ETAL 2,300,182

PERFORATING MACHINE Filed Nov. 18. 1954 5 Sheets-Sheet 5 LTON WN ATTORNEY INVENTOR$ IS E. HAM! ALAN BRO E $9 6 2230 0 So I llllllll m wmmo 4 -1 Y. $22.28 w

v mw mmzmnmm 0252mm om 0 3 89 6 2238 zw w 5mm 0mm 000m oOhN oovm 05 com 002 008 00m om con 00 United States Patent 2,80%,182 Patented July 23, 1957 fire PERFORATIN G MACHINE Francis E. Hamilton, Bingharnton, Charles C. Znleeg, Vestal, and Edgar A. Brown, Owego, N. Y., assignors to International Business Machines Corporation, New York, N. Y., a corporation of New York Application November 18, 1%4, Serial No. 469,806

12 Claims. (Cl. 164--115) This invention relates to an improvement in machines for perforating record cards and more particularly to a novel mechanism for setting up the punches for the perforating operation.

The punching operation is accomplished by first punching a single record card by the usual key operated hand punch, and then placing the card in a machine of the type disclosed herein which will duplicate the pattern or master card in any desired quantity, punching the cards one at a time until the predetermined number has been punched. All holes are punched in each card at a single operation by a selected plurality of punches. This is known as a gang punching operation. M

The principal object of the present inventionis to provide a novel mechanism for setting up the complete data to be punched on a record card for subsequently punching all selected perforations at one time in the record.

An object of this invention is to provide an improved machine for performing punching operations in which the punching is performed at a high rate of speed.

Another object is to provide a mechanism whereby a single control means sets up the punches sequentially in any one or more of the index point positions in a column of a record.

A further object of the invention is to provide apunching mechanism whereby the setting up of the punches by a single control means is accomplished at a high rate of speed, though the setting up devices actually operate at only one-half this speed.

Other objects of the invention will be pointed out 'in the following description and claims and illustrated in the accompanying drawings, which disclose, by way of examples, the principle of the invention and the .best mode, which has been contemplated, of applying that principle.

In the drawings:

Fig. 1 is a side sectional elevation view of the machine showing the card feeding, sensing and punching devices.

Fig. 2 is an enlarged detail view of the punch set-up mechanism showing one of the slides in an actuated posinon.

Fig. 3 is a sectional View taken along lines 3-.3 of Fig. l with parts broken away to show the forward supports for the punching devices.

Fig. 4 is a perspective view showing the details of the punch set-up mechanism.

Fig. 5 is a timing diagram which can be followed-to understand the operations of various mechanical and electrical devices shown herein.

Fig. 6 is an electrical wiring diagram of the preferred form of the invention.

Referring to Fig. 1, it is seen that a stack of blank record cards designated 10 are contained in a hopper R. These cards are the well known IBM cards having eighty columns of twelve punching positions and arefed from the hopper by means of an oscillating arm 12 and a reciprocating slide 13 carrying a picker 14, to a pair of feed rollers 15, 16. From rollers 15, 16 the cards are fed by two sets of rollers 19, 20 and 21, 22 to the punching station comprising twelve rows of punches 51 and a die plate 52.

The perforated cards are carried from the punching station by a pair of feed rollers 23, 24 which convey the punched card past a sensing station comprising brushes 25 and a contact roll 26. These brushes are known as the punch set-up brushes whose purpose will be later described. After leaving the sensing station, the card is carried by three setsof feed rollers designated 27, 28, and 29, 30, and 31, 32 and a guide roller 35 to a discharge hopper 36. The spacing between the sets of feed rollers is such that a card is positioned beneath the punches :and punched before the following card enters the punching station. This is in accordance with standard practice to eliminate any possibility of a card jam. In order for each record card to be punched with the same information, a pattern card must lead the blank cards through the machine. When the first pattern card has reached the punch brushes 25, the blank card following it is entering the punching station. Perforations in the pattern card are read at the sensing station by brushes 25 and the impulses are transmitted to the punch magnets designated PM. This results in the setting up of the punches for the punching of the first blank card.

On the next cycle, the punched card is advanced from the punching station to the punch set-up brushes 25 where it, in turn, is read and serves as the pattern .card for the following blank card. Thus, every card passing through the machine serves in its turn as the pattern card for the card directly behind it.

A punch magnet PM is provided for each card column and as the pattern card passes brushes 25, circuits are completed through the perforations to energize themagnets PM. The magnets control the setting up of the punches in the corresponding index point positions of the blank card at the punching station.

The driving connections for the card feeding mechanism, feed roller shafts and various cam shafts are not shown herein, but it is understood that these shafts are suitably connected to be constantly driven from amotor M shown diagrammatically in Fig. 6 to perform the machine functions in accordance with the machine timing shown in the timing diagram of Fig. 5.

Referring now to Figs. 2 and 3, a shaft 37 is mounted for rotation in machine side frames 38 and 39' and driven through a pulley 49 by suitable belt connections with the motor M. Shaft 37 has a pair of right angle worm gears 41 and 42 which are in mesh with worm wheels 43 and 44, fastened to shafts 45 and 46 respectively. These shafts are rotatably mounted in plates 47 and 48 (Fig. 1) which extend between the side frames 38 and 39. Each shaft 45 and 46 is provided with a series of 12 punch operating cams designated 50 generally, which correspond to the 12 index point positions on the record cards. The manner in which these cams cause a punch 51 to be actuated in the punching operation will be explained later.

In the following description of the punch set up mechanism, only one card column will be considered, it being understood that the machine is equipped with identical parts for each of the eighty columns.

A bail 53 (Figs. 3, 4) is provided for each index position and is yieldably mounted on the side frames 38 and 39 by means of a pair of coil springs 54. Each bail has a set of rollers 55 which are held against the surface of cooperating cams 5i) carried by shafts 45 and 46 under pressure of the springs 54. A finger 56 is carried by each bail for each column position and is pivotally mounted on a rod 57, the finger being adapted to set up an interposer 53 for the ensuing punching operation.

Referring again to Figs. 2 and 3, a support frame is providedto carry thepunch interposers-58 which are moved into alignment with a related punch 51 for setting up the punch to efiect punching during the punching operation. Cross bars 59 and 60 are firmly secured between the machine side frames and a pair of side plates 70 is fastened between the cross bars, one near each side frame. Each side plate 76 is slotted at intervals to provide grooves for receiving a plurality of plates 61 which forms channels for guiding the interposers 58. Each channel is provided with a series of interposers, one for each card column. A row of punch interposers 58 is thus formed for each card column, there being an interposer for each index point position on the card. A series of vertical inserts 49 is provided in each channel, one insert being positioned between each interposer 58. Each interposer is bowed (Fig. 3) and frictionally engages the sides of its adjacent inserts. In order to move an interposer vertically in the channel, a force must be exerted upon itt-o overcome the force of friction between it and the cooperating inserts. In addition each interposer has an enlarged portion 58a which acts as a fulcrum about which the interposer can be turned and a flange 58b at its lower end which rests on the top of a related punch 51.

The punches 51 (Fig. 2) are each associated with-an interposer 58 and are slidably arranged in the guide channels beneath their related interposer-s. A punch actuating bail 62 extends through each channel above the punches. This bail moves the selected punches downwardly on a punching operation, when the lower end flange 58b of the related interposers have been moved under the bail in a manner explained hereinafter. Each punch is provided with a notch 51a which'receives a bail 63. This bail serves as a positive restoring means for the punches. A stop bar 64 also extends through each channel and is secured to the channel plate 61 to cooperate with a projection 580 on each interposer 58 for limiting its upward vertical movement on the restoring operation of the cycle.

Bails 62 and 63 are connected to a pair of supporting plates 65 which are mounted for vertical movement in a pair of channel members 73 secured to the machine side frames 38 and 39. These interconnected bails form in effect, one integral structure which eliminates the possibility of a jam between them when the machine is in operation.

Each plate 65 is provided with a clearance slot 65a through which a rotatably mounted shaft 66 extends. Secured on shaft 66 is a pair of cams 67 which are engaged by rollers 68 carried by the plates 65. The rollers 68 are also engaged by a pair of complementary cams 71 which are fastened on a shaft 72 extending between the machine side frames. Shafts 66 and 72 are constantly driven through a suitable connection from the motor M. These cams positively reciprocate the plates 65 vertically to cause actuation and restoration of the selected punches 51 through bails 63 and 62 respectively. In Fig. it is seen that the bail 62 causes punching to occur at approximately 75 of the cycle from the setting of the punches which was made during the last half of the preceding cycle.

The magnet PM for each column (Fig. 1) controls the setting up of an interposer 58 in a selected index position through a duo of slides designated 75 and 76. The fingers 56 in the even numbered index point positions 12, O, 2, 4, 6 and 8 of a column extend downwardly into a space between related lugs 77 (Fig. 4) which project outwardly from the side of slide 76. The odd numbered fingers 11, 1, 3, 5, 7 and 9 extend downwardly between similar lugs on slide 75. These slides are supported for reciprocation in bearing blocks 79 and 86 and are provided with keeper members 81 and 82 (Fig. 2) pivotally' mounted thereto at 83 and 84 respectively. These keepers are adapted to engage a pair of lugs 75a and 76a extending from the underside of slides 75 and 76 respectively. These lugs limit the counterclockwise movement of the keepers and enable the keepers to push the related slide to the right when they are urged counterclockwise. A notch in the under surface of each keeper member, 81

and 82 receives a bail 85 and 86 respectively. These bails are keyed into shafts 87 and 88 respectively which are mounted for rotation in the machine side frames. A cam follower 89 having a roller 90 is secured to each shaft and a spring 91 extends between bails 85 and 86 to press the rollers 90 against the surface of an eccentric 92 on a constantly rotating shaft 93 which is mounted in the machine side frames. The slides 75 and 76 are maintained under tension by pressure of springs 94. The eccentric 93 is so formed as to cause the bails 85 and 86 to operate 180 out of phase. The slides are in turn moved by their respective bails to oscillate at 180 out of phase as shown in the chart of Fig. 5.

As the eccentric 93 rotates, the odd and even slides are moved alternately against the pole face of the related magnet PM, and if the magnet is not energized, the slides will be moved away from the magnet by the oscillating bails. In the instance where the magnet PM is energized during the time that one end of a slide is moved up to its pole face, the slide is heldagainst movement by the keeper action as explained hereinafter. The fingers 56 (Fig. 2) are moved downwardly by the cams 50, as previously explained, which are timed to mo e the finger in each index position downwardly toward the related interposer 58 during the reading of the corresponding index position by the sensing brushes 25, as shown in Fig. 5. The finger travels downwardly within the restriction of the lugs 77 for engagement with the interposer. When a perforation is not sensed by the brushes 25 in an index position, the finger is deflected by its oscillating slide to push the finger 56 out of line with the interposer 58. As the finger is restored under pressure of springs 54 (Fig. 3), the slide returns it to a position in line with the interposer.

When a perforation is sensed by the brushes 25, the magnet PM is momentarily energized and holds the slide which approaches its pole face from following the related oscillating bail until the related keeper is moved to latching position as explained hereinafter. The finger which is moved downwardly is not deflected by the slide and engages a camming surface 58d on the upper portion of theinterposer 58 to actuate the interposer. The interposer is pivoted about its enlarged portion 58a to bring the flange 58b at its lower end under the punch bail 62. With the interposer in this position, the related punch 51 is actuated when the bail 62 moves downwardly.

The keepers 81 and 82 are pivotally mounted on the slides 75 and 76, as previously explained, and if a slide does not follow its oscillating bail because of the attraction of energized magnet PM, then the keeper is rocked clockwise about its pivot point (Fig. 2) by the bail into latching engagement with a cooperating block. These blocks are designated 95 and 96 and extend between the machine side frames 38 and 39. It should be noted that if the magnet is not energized, the keeper remains in its counterclockwise position and passes under the block.

This is accomplished by providing the springs 94 with sufiicient tension so that the slides 75 and 76 are pulled to the left faster than the bails 85 and 86 can rock the keepers 81 and 82 counterclockwise. The slides can therefore be said to lead the bails. The magnet PM, however, is of suflicient strength to hold a slide against the pressure of its spring 94. This insures that the slide will make its full oscillating cycle. As soon as the keeper is partially latched, the magnet PM can be deenergized and the slide will move only sufficiently to take up the required latching lead. The slide is thus retained in its position near the magnet PM until the bail has almost completed its return stroke. The keeper is then moved counterclockwise until it is free of the latch block. a

The upper end of each interposer 58 extends through a slot in a slidable restoring plate 97 (Fig. 1). This plate is pivotally supported at one end by a cam follower 98 andat the other end bya spring 99 which constantly urges the plate to the right. The cam follower 98 carries a roller 100 which engages a cam 101 secured on'a constantly rotating shaft 102. A spring 103 extends between the follower 98 and side frame 38 to maintain roller 100 against the cam 101. It is understood that similar operating mechanism is provided for the slide near frame plate 39 to produce a balanced structure. From Fig. 5 it is seen that the restoring cam 101 causes the plate 97 to move to the left at 120 which in turn engages any interposers which have been set up to move their flange 58b out from under the punch bail 62. The interposers are completely restored by 157 to prepare the machine for the following punch setting-up operation.

The cards are carried to the punching station by the series of feed rollers previously described and are guided in proper punching position endwise by plates 105 (Fig. 3), but owing to various conditions, it is necessary to provide additional devices to exactly align the card sidewise under the punches. Referring to Fig. 2, the constantly rotating shaft 106 has a cam 107 fastened thereto which is engaged by a roller 108 carried by a cam follower 109. Extending upwardly from a pivotal connection on follower 109 is a pair of links 110, each connected pivotally at its upper end to the free end of a horizontal lever 111 pivotally mounted on a rod 112. A

spring 113 extends between each lever and a support plate 114 to maintain the roller 108 in engagement with the cam 107. On their outer ends these levers carry bars 115 extending the greater part of the length of die plate 52. Bars 115 are each provided with two upwardly projecting fingers 116.

While a card is being pushed into place on the die plate 52 by feed rollers 21, 22 the roller 108 is on the high portion of cam 107, and fingers 116 are in the position shown in Fig. 2. From Fig. 5 it is seen that the roller 103 leaves the high portion of the cam at 15 aided by the springs 113 whereupon the fingers 116 snap into position forcing the card at the punching station to register exactly with die plate 52.

At 113 the roller 108 again moves onto the high portion of cam 107 to withdraw the fingers 116 from the path of the punched card resting on the die plate. The card is then engaged by the stop 119a on a cam 119 which is constantly rotated on shaft 118. This cam frictionally moves the card between feed rollers 23, 24 from whence it is carried to the sensing station for reading by the brushes 25.

To summarize briefly the operation of the machine the punches 51 are set up under control of the card passing under the sensing brushes 25 during the last half of a machine cycle. During this time, a blank card is being moved into the punching station. At the beginning of the following cycle the card aligning mechanism engages the card to hold it in proper registration for the punching operation. After the card is punched, it is released for advancement to the sensing station where it serves as a pattern card during the last half of the same cycle to set up the punches for the punching of the following blank card on the next cycle.

The wiring diagram Referring now to Fig. 6 it is seen that the closure of switch S connects the machine to the source of electrical energy through the two main lines 130 and 131.

For the gang punching operation, a master card is inserted at the bottom of a group of blank cards in the punch hopper R. The cards in the hopper actuate a card lever GL1 to close contacts CLla and energize a relay magnet R through a circuit as follows: From line 130, through relay R10, card lever contacts CLla, to line 131. The start key ST is then depressed and a circuit may be traced from line 130 through the pickup coil of motor relay R12, start key contacts STC, relay contacts R10a (now closed), stop key contacts SPC (normzlly closed), to line 131. The energized motor relay closes contacts R12a to complete a circuit through its vhold coil. The-b contacts of relay'R12 are also closed to complete a circuit through the motor M which causes the motor to operate. Themotor will keep running and the cards will be fed from the hopper R as long as they are present or until the stop key SP-is depressed.

During the second card feeding cycle, which takes place immediately,the master card passes between the die plate 52 and punches 51 (Fig. 1) over to the sensing station at the same time that the first blank card immediately following the master card is moving from the hopper R to the punching station. Next, the punch card lever CL2 is actuated and contacts CLZa are closed completing a-circuit from line through the impulse distributor contacts CB'which are closed during the sensing of each index point position, through contacts CL2a, common brush 132, common contact roll 26, sensing brush 25, the coil of punch magnet PM to line 131.

The movement of the cards is such that the blank card is brought to a halt under the punches 51 by the card aligning mechanism after the last index point position is read by the brushes 25. All the holes 9 to 12 inclusive .in any columns of the master card will be punched at one time in the related columns of the blank card. i

The newly punched card is fed in turn from the punching station to the sensing station as a second blank card is fed into the punching station. Thus, the newly punched card acts as a master card to control the punching of the second blank card, and the second card controls thepunching of the third, etc., until all of the blank cards are gang punched.

While there have been shown and described and pointed out the fundamental novel features of the invention as applied to a preferred embodiment, it will be understood that various omissions and substitutions and changes in the form and details of the device illustrated and in its operation may be made by those skilled in the art, without departing from the spirit of the invention. It is the intention, therefore, to be limited only as indicated by the scope of the following claims.

What is claimed is:

1. In a perforating machine, means for sensing successively the index point positions of a record bearing data designations, a row of punches representing the index point positions of the record, a row of settable related interposers, an actuator for engaging each interposer, a first selecting element representing the even index positions and cooperating with certain of said actuators, a second selecting element representing the odd index positions and cooperating with other of the actuators, means for oscillating said elements and actuators with respect to the row of interposers, whereby said'actuators are ineffective to engage said interposers, means responsive to the sensing of perforations in the record for interrupting the movement of the elements at differential times to position the related actuators for engagement with their related interposers, means for moving the positioned actuators at differential times to engage the related interposers, whereby a setting of the interposers is effected, and means for actuating the punches through said set interposers.

2. The machine as claimed in claim 1, in which the movement of the selecting elements is interrupted alternately by the interrupting means.

3. The machine as claimed in claim 1, wherein the selecting elements are oscillated out of phase by the oscillating means.

4. In a machine of the class described, a plurality of interposers arranged in a column, a plurality of actuators arranged in a like column, one actuator being opposite each interposer, means for driving the actuators in succession toward their related interposers, said actuators being normally ineffective to drive the interposers, but positionable to effect driving engagement, and

selectively settable means for causing such positioning of any actuator prior to its driving action, whereby the related interposer will be driven, said settable means including dual selecting devices, one device causing positioning of the first and alternate actuators and the other device causing positioning of the second and alternate actuators. v

5. In a machine of the class described, means for sensing successively the index point positions of a record bearing data designations, a row of settable related interposers, an actuator for engaging each interposer, a separate bail for pivotally mounting each of said actuators, a first slide representing the even numbered index positions and cooperating with certain of said actuators, a second slide representing the odd numbered index positions and cooperating with other of the actuators, means for oscillating said slides and actuators, with respect to the row of interposers, whereby said actuators are ineffective to engage said interposers, means responsive to the sensing of perforations in the record for interrupting the movement of the slides at difierential times to position the related actuators for engagement with their related interposers, a set of cam elements for operating each bail at differential times to move the positioned actuators into engagement with selected interposers, whereby a setting of these interposers is effected.

6. In a machine of the class described, means for sensing successively the index point positions of a record bearing data designations, a row of settable related interposers, an actuator for engaging each interposer, a first selecting element representing the even numbered index positions and cooperating with certain of said actuators, a second selecting element representing the odd numbered index positions and cooperating with other of the actuators, means for oscillating said selecting. elements and actuators with respect to the row of interposers, whereby said actuators are ineffective to engage said interposers, a magnet for controlling the movement of the selecting elements, means for energizing said magnet in response to the sensing of perforations in the record to interrupt the movement of the elements at differential times, said elements causing the related actuators to be positioned for engagement with their related interposers, means for moving the positioned actuators at differential times to engage the related interposers, whereby a setting of the interposers is effected.

7. In a perforating machine, means for sensing successively duodecimal index point positions of a record, a row of punches representing the index point positions of the record, a row of settable related interposers, a shifta'ole plate having a series of slots therein, each interposer extending through one of said slots, an actuator for engaging each interposer, a first selecting element representing the even numbered index positions and cooperating With certain of said actuators, a second selecting element representing the odd numbered index positions and cooperating with other of the actuators, means for oscillating said elements and actuators with respect to the' row of interposers, whereby said actuators are ineffective to engage said interposers, means responsive to the sensing of perforations in the record for interrupting movement of the elements at differential times to position the related actuators for engagement with their related interposers, means for moving the positioned actuators at differential times to engage the related interposers, whereby a setting 'of the interposers is effected, means for actuating the punches through said set interposers, and means for moving said plate after actuation of the punches, whereby said set interposers are restored.

8. In a machine of the class described, means for sensing successively the index point positions of a record bearing data designations, a row of settable related interposers, an actuator for engaging each interposer, a first selecting element representing the even numbered index positions and cooperating with certain of said actuators,

a second selecting element representing the odd numbered index positions and cooperating with other of the actuators, means for oscillating said selecting elements and actuators with respect to the row of interposers, whereby said actuators are ineffective to engage said interposers, a magnet for controlling the movement of the selecting elements, each of said elements being alternately moved near the pole face of said magnet by said oscillating means, means for energizing said magnet in response to the sensing of perforations in the record to interrupt the movement of the elements at differential times by holding the element against said pole face, whereby the related actuators are positioned for engagement with their related interposers, means for moving the positioned actuators at differential times to engage the related interposers, whereby a setting of the interposers is effected.

9. In a machine for gang punching a group of record cards under control of a master card, said cards having columns of index point positions, .a plurality of rows of punches representing the index point positions on the cards, a plurality of rows of settable related interposers, an actuator for engaging each interposer, a first selecting element for each row of interposers representing the even index positions and cooperating with certain of said actuators, a second selecting element for each row of interposers representing the odd index positions and cooperating with other of the actuators, means for oscillating said elements and actuators with respect to the row of interposers, whereby said actuators are ineffective to engage said interposers, card sensing means, means for feeding the cards successively, first under the punches and then past the sensing means, means responsive to the sensing of perforations in the master card for interrupting the movement of the elements at differential times to position the related actuators for engagement with their related interposers, means for moving the positioned actuators at differential times to engage the related interposers, whereby a setting of the interposers is effected, and means for actuating the punches through said set interposers, whereby each card is perforated with the data sensed on the preceding card.

10. In a cyclically operable machine for gang punching a group of record cards under control of a master card, said cards having columns of duodecimal index point positions, a plurality of rows of punches representing the index point positions on the cards, a plurality of rows of settable related interposers, an actuator for engaging each interposer, a first selecting element for each row of interposers representing even numbered index positions and cooperating with certain of said actuators, a second selecting element for each row of interposers representing the odd numbered index positions and cooperating with other of said actuators, means for oscillating said elements and actuators with respect to the row of interposers, whereby said actuators are ineffective to engage said interposers, means for sensing the index positions on the cards, means for feeding the cards successively, first under the punches and then past the sensingmeans, a magnet for controlling the movement of the elements, means for energizing said magnet in response to the sensing of perforations in the record to interrupt the movement of the elements at differential times, said elements causing the related actuators to be positioned for engagement with their related interposers during a cycle of operation, means for moving the positioned actuators at differential times to engage the related interposers, whereby a setting of the interposers is effected, and means for actuating the punches through said set interposers on the following cycle of operation, whereby each card is perforated with data sensed on the preceding card.

11. In a machine of the class described, a plurality of interposers arranged in a column, a plurality of actuators arranged in a like column, one actuator being opposite each interposer, means for driving the actuators in succession toward their related interposers, said actuators being normally ineffective to drive the interposers but positionable to effect driving engagement, a pair of oscilrupted at differential times by the magnet holding the lating slides for causing such positioning of an actuator slide against its pole face. prior to its driving action, one slide causing positioning of the first and alternate actuators and the other slide Ref Cit d in the file of thi ate t causing positioning of the second and alternate actuators. 5

12. The machine as claimed in claim 11, in which a UNITED STATES PATENTS magnet is provided to control the movement of the slides, 1,110,261 Hollerith Sept. 8, 1914 means for alternately moving said slides near the pole 1,138,314 Powers May 4, 1915 face of said magnet, and means for selectively energizing 1,848,159 Carroll Mar. 8, 1932 said magnet so that the movement of the slides is inter- 10 2,623,592 Knutsen Dec. 30, 1952

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