US2316795A

US2316795A - Keyboard perforator

Info

Publication number: US2316795A
Application number: US401113A
Authority: US
Inventors: Ross A Lake
Original assignee: Teletype Corp
Current assignee: AT&T Teletype Corp
Priority date: 1941-07-05
Filing date: 1941-07-05
Publication date: 1943-04-20
Anticipated expiration: 1960-04-20
Also published as: GB558210A

Description

April 20, 1943. R. A. LAKE KEYBOARD PERFORATOR INVENTOR ROSS A. LAKE ATTORNEY April 20, 1943. R. A. LAKE I KEYBOARD PERFORATOR Filed July 5, 1941' 2' sheets-Shea 2 INVENTOR ROSS A. LAKE AT-TORNEY Patented Apr. 20, 1943 UNITED STATES PATENT OFFICE Corporation, Chicago, 111.,

Delaware a corporation of Application July 5, 1941, Serial No. 401,113

34 Claims.

The present invention relates to peri'orators for telegraphic purposes and more particularly to improvements in a keyboard actuated mechanism for the perforation of a control strip.

The principal object of the invention is to provide a mechanism for insuring the reliable operation of apparatus for perforating strips.

Another object is to provide a positive means for precluding the premature reoperation of the electromagnet of a magnetically operated perforating apparatus.

A further object of the invention is to provide a mechanism for assuring the proper step by step feeding movement of the control strip, irrespective of irregular and tremlulous operations of the keys.

To achieve the above and other objects of the invention, a keyboard mechanism is provided which is arranged with a plurality of keys operatively associated with pairs of vertically movable permutation bars through which interponent bars of a perforating mechanism are moved selectively to control the operation of punch pins allotted thereto and to perforate a tape correspondingly.

Specifically, the salient feature of the present invention resides in the provision of means for more accurately and efiiciently controlling the period of energization of the perforating electromagnet, to render it entirely independent of the variations of manual operation, due primarily to a momentary closure of the electrical circuit resulting from a staccato or incomplete depression of the key, and secondly, to the tendency to depress a second key before the operation in response to the actuation of the preceding key is consummated. In the present device, a positive action latch is provided to insure completion of the perforating motion independently of the manual release of the key. An antichatter means is also provided which is effective in conjunction with the positive action latch to insure reliable and consistent operation of the perforator. Furthermore, a second latch or curb element is provided which cooperates with the positive action latch and anti-chatter means to insure the completion of the tape feeding operation.

When a key has been depressed, a contact operating lever permits the punch magnet contacts to close under their own spring tension, but a moment before such closure is efiected the contact operating lever will become latched up by the positive action latch to preclude the punch magnet contacts being prematurely opened by the release of the key lever. As soon as contact has been made, the perforator armature is attracted, permitting an anti-chatter mechanism to become effective during the very early part of the armature movement, the advantage being that the energization of the punch magnet is taken almost immediately out .of the control of the contact operating lever and placed under the control of the armature which is actuated by the punch magnet. The anti-chatter mechanism acts to push the punch magnet contacts together against their normal spring tension independently of the key operated contact operating lever. In this manner, the punch magnet contacts will remain closed as long as the punch magnet is energized, which is so long as the punch operating lever is held latched, or is held manually operated, To break the circuit through the punch magnet, the armature acts upon the positive action latch to unlatch the punch contact operating lever which, if the key lever has been released, will return to its unoperated or initial position to again separate the contact springs. Consequently, the vibration or chattering of the punch magnet contacts is prevented. Moreover, when the armature is partially attracted it also acts to position a curb member in the path of a projection of the contact operating lever to prevent reoperation of the contact operating lever until a complete tape feeding operation has been completed. Under such conditions of operation only one group of perforations appears in the tape for each depression of a key and the tape feeding motions will be rendered invariable.

A better understanding of the invention may be had from the following description, taken in conjunction with the accompanying drawings, wherein;

Fig. 1 is a longitudinal sectional view of the keyboard perforating mechanism according to the present invention;

.Figs. 2, 3, 4, and 5 are similar fragmentary views of the perforating mechanism showing the arrangement of the elements under various conditions of operation;

Fig. 6 is a partial plan view of the perforating mechanism with certain parts removed; to show other parts more clearly; and

Fig. 7 is an elevational view of the back spacing mechanism according to the present invention.

The keyboard mechanism according to the present invention is of the type disclosed in U. S. Patent No. 1,965,572, granted 'July 10, 1934, to

C. W. Burcky et al., and reference may be had to said patent for a complete disclosure and understanding of details not shown herein.

Referring now to the drawings in which like reference characters are used to designate similar parts throughout the several views, there is shown in Fig. l a keyboard I l comprising a base casting I2. Positioned to the rear of the base casting I2 and suitably journaled therein is a pivot rod I3 which extends transversely of the casting. A plurality of key levers :4 are pivotally mounted on the rod [3 and are normally biased upwardly by individual springs (not shown). As is the usualpractice, key levers l4 are provided at their forward ends with keys l5 arranged in banks.

Beneath the key levers l4 and extending transversely thereof, are a plurality of pairs of permutation bars 16 which form a part of a selector mechanism of the type fully disclosed in U. S. Patent No. 1,884,753 to which reference may be had for a more complete understanding of the details thereof. The structure disclosed in the drawings is provided for operation in response to a five-unit code, and consequently, a corresponding number of pairs of permutation bars I5 is employed. However, a larger or a smaller number of pairs of bars :6 for a corresponding code may be used. Each pair of permutation bars l5 comprises a bar I! and a bar I8, and these bars are provided at each end with vertical slots or notches I9 and 2|, respectively, which fit over guide combs 22 and 23, carrying

pivot rods

24 and 25. The bars I! and 18 are thus held against longitudinal movement, but are free to be shifted Vertically in resp to the operation of key levers I4 about pivot rod I3.

Pivotally mounted on

rods

24 and 25 are pairs of rocker members 26 and 21 interposed between each pair of permutation bars IS. The rocker members 25 and 21 are substantially T-shaped, with their free ends formed with oppositely directed lugs. One of the lugs of each rocker member projects forwardly into a notch on the lower edge of the corresponding permutation bar H, and the other lug projects rearwardly be-' neath the companion permutation bar l8. With this arrangement, the depression of either permutation bar of the pair of bars [6 rocks the rocker members 25 and 21 and lifts the companion permutation bar. To the depending portion of the T-shaped rocker members 26 and 21 is pivotally articulated a longitudinally movable permutation bar 28. Thus, when the permutation bars i1 and 13 are moved vertically, in a manner to be described presently, in accordance with the depression of a key lever l4, thepermutation bar 28 individual to each pair of the permutation bars I1 and I8 is moved longitudinally, or in the direction of its length. I

Each of the key levers I4 isarranged, when operated, to engage and depress one of the permutation bars of each pair of permutation bars IS and to shift these permutation bars in accordance with a character code combination. To achieve this object, the upper edges of the permutation bars [1 and iii are notched to provide high and low portions in accordance with the respective code combinations. Also, the bars of each pair of permutation bars are complementary; that is, the notches of one bar are opposite the projections of its companion bar. The interconnection between the bars of each pair of bars l5 by means of the rocker members 25 and 21 prevents the simultaneous depression of two key levers. If an attempt is made to move or operate more than one key lever, the key levers can only be depressed for a short distance, when they will be blocked by the high portions of the permutation bars. By this construction, the simultaneous depression of two key levers and the perforation of an incorrect code combination is prevented.

When the keyboard mechanism, according to the present invention, is employed in combination with a transmitter, a series of levers 20 is provided pivotally articulated to the permutation bars 28. This arrangement is clearly described in Patent No. 1,965,572 to C. W. Burcky et al. which has already been referred to.

The perforator disclosed in Fig. 1 comprises a set of code punches 29 movable through openings in upper and lower guide plates 3| and 32 and cooperative with a die plate 33 to perforate a tape 34. The plates 3| and 33 are spaced apart to form a tape guide. Intermediate the guide plates 3| and 32 is a retract plate 35 which cooperates with shoulders on the code punches 29. and a feed-hole punch pin (not shown), and due to the action of springs 35 operates to re. move the. punches clear of the tape following the operation of a punch hammer 3'1. The code punches 29 are selectively operated by the actuating member or punch hammer 31 through the instrumentality of a set of punch interponent bars 33 corresponding in number to'the punches 29. Operatively associated with each of thebars 38 is a pivoted arm 39 mounted on pivot rod 68,

and connected to. a permutation bar 28 by means of a link 4|.

The hammer 31 rocks about its shaft 42. and forms the armature of an electromagnet 43. The punch hammer 31 comprises a comb portion 44 through which the assembly is pivotally mounted on shaft 42.. Secured to comb portion 44 is a member 45.which extends rightwardly and leftwardly therefrom (as viewed in Fig. 1). The member 45 and the lateral portion 48 of the comb or guide portion 44 are to be considered as the punch operating unit or the unit through which the punches 29 are operated permutatively in accordance with the setting of punch interponents 38, which are'set permutably into or out of alignment with the punches by the actuation of the permutation bars 28 in response to the depression of the key levers I4. Also secured to the member 45 by screws 41 (Fig. 6) is an armature 48 positioned above a pair of coils of the electromagnet 43'.

When'the perforating magnet 43 is not energized, the hammer 31 is retained in its counterclockwise position against an adjustable stop 52 by a spring 53 (as shown in Fig. 1). However, upon energization of magnet 43 to perform a perforating operation, the hammer 3| is rocked to its clockwise position against a stop 54 in opposition to the spring'53, and in this position (Fig. 4) the punches will be operated'to effect the perforation of the tape.

A pawl member 55 is pivotally carried at the left-hand end of the'p-unch operating member 45 and cooperates with ratchet teeth 55. of a feeding roller 51, which is also provided with feed pins 58 adapted to mesh with feed holes which are invariably perforatedin the tape 34. Thus,

when' the magnet 43 is energized and the hammer 31 is rocked toits clockwiseposition, pawl 55 is raised to; engage a; tooth 56 on the feeding roller 51. Then, upon de-energization of magnet 43-, spring 53 actuates the; hammer 31 to its counterclockwise position and draws the pawl 55 downwardly, which movement causes the feeding roller 51 to be rotated counterclockwise one angular step to efiect the spacing of the tape 34 one unit distance.

There is mounted on the frame 59 a bracket 6| and pivotally mounted at 62 on said bracket is a latch lever 63 and a curb member 64. Lever 63 is normally biased in a clockwise direction by a spring 65, and member 64 is normally biased in a counterclockwise direction by a spring 66. A contact operating lever 61 is pivotally mounted on the pivot rod 68 and is connected by an adjustable link 69 to the universal bar (not shown) but which is comparable to one of the permutation bars 28 and which is operated invariably upon the depression of a key lever I4. Lever 61 is provided with a laterally projecting portion II which cooperates with the latch 63 and the curb bar 64. Lever 67 is also provided with an insulated portion 12 which cooperates with contact spring 13. Latch lever 63 isprovided with an arm I4 which cooperates with a striker pin I5 carried by the armature 48 of the punch magnet 43. Curb member 64 is provided with an arm 16 which cooperates with the lower flange II! of a U-shaped member 11 secured to the armature 48. Specifically, as shown in Figs. 2 and 6, the upper flange of the U-shaped member 11 is secured to plate 59 of armature 48 by nut 69 (Fig. 2) while the lower flange 18, as previously indicated, coacts with said arm I6.

Pivotally mounted at I8 on the bracket 6| is an anti-chatter member I9. Member I9 is provided with a horizontal arm 8I which cooperates with a stud 82 carried on the armature 48. Member I9 is also provided with a depending arm83 which acts on a contact spring 85 of the pair of contact springs '13 and 85. Member I9 is normally biased counterclockwise by a spring 84 extended between an arm I of member I9 and armature 48 (Fig. 2) the arm 8| being urged into contactwith the stud 82 carried by the armature 48.

As indicated in Fig. l, the punch mechanism is of the form shown in U. S. Patent No. 2,255,794, granted September 16, 1941, to R. A. Lake, whereby the punches 29 are utilized to so pierce the tape material 34 as to leave an uncut portion which serves as a hinge, thus resulting in a hinged lid which will yield to the sensing pins in a telegraph transmitter when the tape is employed for automatic control of signal transmission. To facilitate the back spacing of such tape having lidded apertures, the present invention provides a tape tearing knife 9I of special design, having a bevel directed as shown in Fig. 1 to cam down the lids, and thus preclude said lids from being caught by the sharp edge of the tearing blade or knife and bent back. In the punch mechanism according to the above referred to R. A. Lake patent, a series of spring-loaded ejectors I are provided for ejecting the hinged lids from the die plate to facilitate the advancement of the tape through the punch mechanism. In order that the tape may be readily moved in a reverse direction for a back spacing operation, each of the ejectors 5| is provided with a wing portion 49 having an inclined lower edge, so that as the tape 34 is moved rightwardly (as viewed in Fig. 1) for back spacing, any of the hinged lids which may be projecting upwardly at an angle will be cammed downwardly by the wing portion 49 so as to clear the die plate.

The back spacing mechanism is shownin Fig. 7 and consists of a main lever 92 pivoted at 93 to the frame 58. Lever 92 comprises a thumb portion 94 and

arms

95 and 96. Secured to the extremity of arm 95 is a laterally projecting pin 91, which cooperates with the bent upper end of, feed pawl 55 in such a manner that when lever 92 is rotated clockwise, pin 9'! acts to cam the pawl 55 leftwardly to disengage the pawl tooth from the tape feed ratchet teeth 56. The arm 96 carries pivoted at its extremity, a back spacer pawl 98 having arms 99 and IUI. Pawl 98 is normally biased in a clockwise direction by a spring I02 to bring arm 99 thereof against a stud I03 mounted on arm 96 of lever 92. Thus, when lever 92 is rotated clockwise to effect back spacing of tape 34, the pin 91 acts to cam pawl 55 out of mesh with the feed ratchet just prior to the cooperation of arm I8I of back space pawl 98 with a tooth on the star wheel I04 to cause the star wheel I94 to rotate one angular step in a clockwise direction. The star wheel I04 is held in position by a spring actuated detent I05. Lever 92 is normally biased counterclockwise by a spring General operation In the operation of the mechanism according to the present invention, the depression of a key lever I4 will set the bars I? and I8 of the pairs of permutation bars I6 characteristically according to the code identified by the operated key lever. The rocker members 25 and 27 will be correspondingly rocked to set the permutation bars 28 in their rightward or leftward position which, through links 44, will move the levers 39 to their clockwise or counterclockwise position to set the interponents 38 correspondingly to block or clear the punches 29. The key lever I4 also acts upon a universal bar, as described in the Patent No. 1,965,572 to C. W. Burcky et a1. granted July 10, 1934, in which the operation of the universal bar is specifically described, to move a bar similar to bar 28, which acts through a link 69 to rotate the contact operating lever 61 counterclockwise to permit the projection H of the operating lever 61 to become latched by the latch lever 63. During this movement of the lever 61 the contact spring '!3 is permitted to follow the insulated portion I2 to bring the contacts on springs 13 and closer together, as seen in Fig. 2. The arrangement is so constructed that when the latch 63 falls into latching position relative to the contact operating lever 61 (as shown in Fig. 2), the contacts I3 and 85 will not close at this time, but will be drawn very close together. Upon the continued counterclockwise rotation of lever 61, the contacts on springs 13 and 85 will close. It is understood, of course, that the depression of the key lever is deemed to be a continuous movement, and what appears to he steps herein are merely transient conditions which arise during the operation of the key lever. When the contacts on springs l3 and 85 are thus permitted to close, an obvious operating circuit 86 (Fig. 6) is closed to cause the energization of the punch magnet 43. The armature 48 is attracted, causing the punch hammer 3'? to rotate clockwise about its pivot 42. During the very early portion of the movement of the armature 48 toward the poles of the punch magnet 43, the anti-chatter member I9 will, through its arm 8|, follow the stud 82 of the armature 49 to begin its counterclockwise rotation under the influence of its spring 84, and in so doing, carry the contact springs 13 and 85 (through its depending arm 83) rightwardly as seen in Fig. l) to take the control of these contacts out of the control of the contact operating lever 61. As the armature 48 is drawn closer to the poles of the magnet 43', as shown in Fig. 3, the U-shaped member 11 moves away from arm 16 of the curb member 64' and permits the curb member 64 to be rotated counterclockwise by its spring 66 to the position shown, wherein the curb member bears against the underside'of the lateral portion H of the contact operating lever 61. When the operator releases the key, the contact operating lever 61 is free to move slightly in a clockwise direction as viewed in Fig. 2. When the punch hammer 31 is rotated clockwise and stud contacts with the arm 14 of latching lever 63, lever 63 is rotated in a counterclockwise direction away from the laterally extending portion H of the contact controlling lever 61. The curb member 64 which prior to this movement of the latching lever 63 was urged in a counterclockwise direction by the influence of spring 66 against the laterally extending portion ll of contact controlling lever G1, is now permitted to move upwardly so that the notched portion of the curb lever 64 moves into a position to block a repeat operation of the contact controlling lever El. Moreover, the counterclockwise rotation of lever 19 under the influence of spring 84 having been limited by a stop 38, a gap between arm 8| and stud 82 and between insulation I2 and contact spring 13 will appear, as seen in Fig. 3.

Upon reaching its full clockwise position against the poles of the punch magnet 43, the armature 48, through its striker member '15, acts upon arm 14 of latch 63 to rotate said latch counterclockwise about the pivot 62 against the tension of spring 55. as shown in Fi 4, thus permitting, if the key lever M has been released, the contact operating lever 61 to be actuated clockwise by its spring 31 against a suitable adjustable stop 88 (Fig. 1). Shortly after the lever 6!- begins to return to its rightward position, the curb member 64 is actuated by its spring 56 to bring the shoulder thereon into the path of the lateral portion M (Fig. 5). If an attempt is madethereafter to reoperate the contact operating lever 61 before the punch hammer 3'! is returned fully to its counterclockwise position against stop 52 (at which point the feeding operation is completed), the leftward movement of the contact operating lever 61 will be obstructed by the shoulder onthe curb bar 64. As shown in Fig. 5, the curb member 64 remains effective to block movement of the lever 6'! until approximately the completion of the upward movement of armature 4B (or the counterclockwise movement of member 3D, whereat the curb member 64 will be engaged and rotated by the U-shaped member I? to rotate the curb member 64 clockwise against-the tension of its spring 85 to disengage the shoulder of the curb member 64 from the lateral projection H of the punch contact operating lever 51. By this latter feature of this invention, a complete and invariable feeding operation on the tape 34. is assured with each operation of the punch hammer 31, and the reoperation of a key lever, before the completion of a feeding operation, is preeluded.

Although a specific embodiment of the invention has been disclosed herein, it is understood that all forms which come within the scope of equivalency of the appended claims are intended to be embraced thereby.

What is' claimed is:

1. In a perforator, an-electroma'gnet-ically con trolled punch actuator, a circuit therefor, a contact in said circuit, control means for said contact, and means effective by the actuation of said actuator to supplement the prior control of said control means to preclude premature reoperation of said actuator,

2. In a keyboard perforator, a series of keys, an electromagnetically controlled punch actuator, a circuit therefor, a contact in said circuit, means controlled by said keys for governing the operation ofsaid contact, and means effective by the actuation of said actuator to supplement the prior control ofsaid governing means to preclude premature reoperation of said actuator.

3. In a perforator, an electromagnetically controlled punch actuator, a circuit therefor, a contact in said circuit, anti-chatter means for governing the operation of said contact, latch means for promoting the completion of operation of said punch actuator, and curb means effective upon operation of said actuator to supplement the prior control of said governing means to insure invariably the complete operation of said actuator.

4. In a perforator, an electromagnetically controlled punch actuator, a circuit therefor, a contact in said circuit, anti-chatter control means for said contact, a latch means to promote the operation of said punch actuator in response to the closure of said contact, and blocking means effective upon the operation of said actuator to supplement the prior control of said control means to insure invariably the complete operation of said actuator.

5. Ina perforator, an electromagnetically controlled punch actuator, acircuit therefor, a contact in said circuit, a contact operating lever, an anti-chatter means controlled by the armature of the punch actuator magnet and effective upon operation of said lever, a latch means cooperable with said lever to promote the operation of the punch actuator magnet, andcurb means effective upon operation of said actuator to supplement the prior control of said governing means to insure invariably the complete operation of said actuator.

6. In a keyboard perforator, a series of keys, an electromagnetically controlled punch actuator, acircuit therefor, a contacti'n said circuit, means controlled by said keys for governing the opera-- tion of said contact to operate said actuator, a tape stepping means operated by said punch actuator, and curb means rendered effective by said actuator to prevent premature reoperation of said actuator to insure invariably the complete operation of said tapestepping means,

7. In a perforator, an electromagnetically operated punch actuator, contact means to control the operation thereof, control means for said contact means to initiate the operation of said actuator, and permissively operated means'controlled by said actuator to supplement the prior effect of said control means to insure the com-' plete operation of said actuator.

8. In a perforator, an electromagnetically operated punch actuator, contact means to control the operation thereof, control means for said contact means to initiate the operation'of said actuator, permissively operated means controlled by said actuator to supplement the prior eifect of said control means to insure'the operation of said actuator, and curb means for preventing premature reope'ration of said control means.

9'. In a perforator, an electromagnetically op- 3 erated punch actuator, contact means to control the operation thereof, control means for said contact means to initiate the operation of said actuator, permissively operated means controlled by said actuator to supplement the prior efiect of said control means to insure the operation of said actuator, tape stepping means operated by said punch actuator, and curb means for preventing the premature reoperation of said tape stepping means.

10. In a keyboard perforator, a series of keys, a punch actuator, means for operating said actuator, means controlled by said keys to control said first recited means to initiate the operation of said actuator, and permissively operated means controlled by said actuator to supplement the prior effect of said second recited means to insure the complete operation of said actuator.

11. In a keyboard perforator, a series of keys, a punch actuator, means to control the operation of said actuator, contacts controlled by said keys to control said means to initiate the operation of said actuator, permissively operated means controlled by said actuator to maintain said contacts closed independently of the key operated, and means to prevent premature reoperation of said actuator.

12. In a keyboard perforator, a series of keys, a punch actuator, means to control the operation of said actuator, contacts controlled by said keys to control said means to initiate the operation of said actuator, permissively operated means controlled by said actuator to maintain said contacts closed independently of the key operated, and curb means for preventing premature reoperation of said actuator.

13. In combination, means for producing lidded apertures in a signal control strip comprising punch and die means, strip advancing means, ejecting means cooperable with said punch and die means to facilitate the operation of said advancing means, means for effecting the reverse movement of said strip advancing means, guide means associated with said ejecting means for guiding the lids of said apertures to facilitate the reverse movement of said strip advancing means, and strip severing means contoured to cooperate with said guide means during the reverse movement of said strip advancing means.

14. In combination, means for producing lidded apertures in a tape comprising punch and die means, tape feeding means, spring loaded ejectors cooperative with said punch and die means to level the lids of said apertures substan tially into the plane of said strip to facilitate the normal progressive operation of said feeding means. means for effecting the reverse movement of said tape feeding means, guide means associated with said ejecting means for guiding the lids of said apertures to facilitate the reverse movement of said tape feeding means, and tape severing means contoured to cooperate with said guide means during the reverse movement of said tape feeding means.

15. In a keyboard perforator, a series of keys, an electromagnetically controlled punch actuator, a circuit therefor, a contact in said circuit, anti-chatter means controlled by said keys for governing the operation of said contact, latch means for promoting th completion of operation of said punch actuator, and curb means effective upon operation of said actuator to supplement the prior control of said governing means to insure invariably the complete operation of said actuator.

16. A perforating mechanism including punch elements and an electromagnetic punch operator, contacts for controlling said electromagnetic punch operator for operation, means for selecting said punch elements for operation and for operating said contacts to effect the energization of said electromagnetic punch operator, supplemental contact controlling means to maintain said contacts operated for the duration of operation of said punch operator, and means controlled by said punch operator for rendering said first recited means ineffective on said contacts for said duration to prevent premature reoperation of said punch operator.

17. In a perforator, an electromagnetically operated punch actuator, contact means to control the operation thereof, control means for said contact means to initiate the operation of said actuator, permissively operated means controlled by said actuator to supplement the prior elTect of said control means to insure the operation of said actuator, tape stepping means operated by said punch actuator, and blocking means for preventing the reoperation of said control means until said tape stepping means has completed its cycle of operation.

18. In a perforator, a punch actuator, means to control the operation of said actuator, contacts to control said means to initiate the operation of said actuator, permissively operated means controlled directly by said actuator to maintain said contacts closed to insure the complete operation of said actuator, and means to prevent premature reoperation of said actuator.

19. In a perforator, a punch actuator, means to control the operation of said actuator, contacts to control said means to initiate the operation of said actuator, permissively operated means controlled by said actuator to maintain said contacts closed to insure the complete operation of said actuator, and means for preventing the reoperation of said first mentioned means until said actuator has completed its cycle of operation.

20. In a tape perforator, an electromagnetically operated punch actuator, contacts for operating said actuator, means to control the operation of said contacts, means to latch saidcontrol means to promote the operation of said punch actuator, and means controlled by said actuator to maintain said contacts in their operated position until the punching operation is completed.

21. In a tape perforator, an electromagnetically operated punch actuator, a switch for controlling the operation of said actuator, means to control the operation of said switch, means to latch said control means prior to the operation of said switch, and means controlled by said actuator to maintain said switch in its operated condition until the punching operation is completed.

22. In a tape perforator, an electromagnetically operated punch actuator, a switch for operating said actuator, means to control the operation of said switch, a latch for latching said control means prior to the operation of said switch, and means controlled by said actuator to insure completion of the punching operation.

23. In a tape feeding means, an electromagnetically operated feed actuator, contact means to control the operation thereof, control means for said contact means to initiate the operation of said actuator, and blocking means controlled by said actuator to prevent the reoperation of said contact means until the complete operation of said feed actuator.

24. In a tape perforator, an electromagnetically operated punch actuator, contacts for operating said actuator, control means for operating said contacts, a latch for latching said control means prior to the closure of said contacts, means to maintain said contacts operated until the punching operation is completed, tape feeding means operable by said punch actuator, and blocking means operable by said punch actuator to prevent a reoperation of said contacts until the feeding operation is completed.

25. In a recorder, recording means, an actuator therefor, means for controlling the operation of said actuator, and permissively operated means operable by said actuator and eifective upon operation of said actuator for supplementing the prior control of said means to insure the completion of operation of said actuator.

26. In a recorder, recording means, an actuator therefor, means for controlling the operation of said actuator, means operable by said actuator for supplementing the prior control of said means to insure the completion of operation of said actuator, and means to preclude the premature reoperation of said actuator.

27. In combination, a tape feeding device susceptible of an incomplete cycle of operation, actuating means for said tape feeding device, control means for operating said actuating means, means to operate said control means to initiate the operation of said tape feeding means, and means to prevent the reoperation of said control means until a complete cycle of operation is performed.

28. In combination, a tape feeding and perforating device susceptible of an incomplet cycle of operation, actuating means for said device, said device being operable in a portion of its cycle to perform a perforating operation and in a full cycle of its operation to perform a feeding operation, control means for operating said actuating means, means to operate said control means, and means to prevent the reoperation of said control means until a complete cycle of operation is performed.

29. In combination, a tape perforator susceptible of an incomplete cycle of operation, actuating means for said perforator, control means for'operating said actuating means, means to operate said control means to initiate the operation of said perforator, and means controlled directly by said actuator to prevent the reoperation of said control means until a complete cycle of operation is performed.

30, In combination, a perforator susceptible of an incomplete cycle of operation, actuating means for said perforator, control means for initiating the operation of said actuating means,-

and means operated by said actuating means to prevent the reoperation of said control means until a complete cycle of operation is performed.

31. In combination, a material feeding device susceptible of an incomplete cycle of operation, actuating means for said feeding device, control means for initiating the operation of said feeding device, and means operated by said actuating means to prevent the reoperation of said control means until a complete cycle of operation is performed.

32. In combination, a perfcrator susceptible of an incomplete perforating operation, actuating means for said perforator, control means for initiating the operation of said actuating means, means for latching said control means upon the operation thereof, and means operated by said actuating means for insuring the completion of the perforating operation.

33. In combination, a perforator, an electromagnetic actuator for said perforator, control means for operating said actuator, means for latching said control means upon the operation thereof, and means operated by said actuator for insuring the completion of the perforating operation.

34. In a perforator, a punch actuator, an elec-.

trcmagnet for controlling said actuator, a switch for controlling said electromagnet, a control lever for initially operating said switch, means for operating said control lever, a latch for latching said control lever prior to the operation of said switch, and a member releasable directly and instantaneously by said actuator upon the operation thereof for maintaining said switch in its operated condition during a punching operation.

ROSS A. LAKE.