US1965572A

US1965572A - Keyboard perforator transmitter

Info

Publication number: US1965572A
Application number: US649686A
Authority: US
Inventors: Charles W Burcky; Albert H Reiber
Original assignee: Teletype Corp
Current assignee: AT&T Teletype Corp
Priority date: 1932-12-31
Filing date: 1932-12-31
Publication date: 1934-07-10
Anticipated expiration: 1951-07-10

Description

July 10, 1934. c:.'w. BURCKY ET AL KEYBOARD PERFORATOR TRANSMITTER Filed Dec. 31, 1932 5 Sheets-Sheet 1 INVENTOR CHQQLES n. BUQCKY ALBEPT/Y. P675152 I/#6 ATTO R N EIW July 10, 1934. c. w. BURCKY ET AL KEYBOARD PERFORATOR TRANSMITTER 51. 1932 5 Sheets-Sheet 2 Filed Dec.

l l I lll-l-llllllllllllllllll July 10, 1934.

C. W. BURCKY ET AL KEYBOARD PERFORATOR TRANSMITTER gFiled Dec. 31. 1932 5 Sheets-Sheet 3 July 10, 1934. c. BURCKY ET AL 1,965,572

KEYBOARD PERFORATOR TRANSMITTER Filed Dec. 31, 1952 5 Sheets-Sheet 4 ATTORNE July 10, 1934. cv w. BURCKY ET AL KEYBOARD PC5517 HATCH TRANSMITTER 5 Sheets-Sheet 5 Filed Dec. 31, l

' INVENTORS CHAQLES W GUPCKY ALBEQT 'I'. IPE/BE'Q 37W ArToRN Patented July 10, 1934 F UNITED- STATES PATENT OFFICE v 1,965,572 KEYBOARD PERFORATOR. TRANSMITTER Charles W. Burcky and Albert H. Reiber, Chicago, Ill., assignors to Teletype Corporation, Chicago,

111., a corporation of Delaware Application December 31, 1932, Serial No. 649,686 18 Claims. (Cl. 178-17) This invention relates to printing telegraph remain in their set position until subsequently apparatus and more particularly to a keyboard changed as a. result of a depression of another actuating and controlling mechanism for use key lever. Under these conditions, the interprimarily in telegraph systems. ference bars of the perforator remain in their An object of the invention is the provision of set position; and to guard against the possibility a compact, extremely simple, and unitary keyof operating the interference bars for the correcontrolled mechanism operative in response to sponding perforation of the tape prematurely, the depression of keys to transmit to a distant the mechanism embodies an element responsive station current impulses representative of charto the depression of the character keys when 10 acters to be recorded and/or recorded or stored other parts of the mechanism are in a predeterin the form of perforations or indentations in mined position for preventing the premature a recording medium for future transmission. operation of the perforator and insuring that the Another object of the invention is the provision up f p rf at ns app arin n th t of a switching mechanism capable of being polowing a change from direct keyboard transmissitioned variantly to permit the operation of the sion to tape perforation will be representative '1 apparatus according to its several possible func- 0f he settin i /t permutation ba s in accordtions. ance with the depression of the subsequently de- A further object of the present invention is a pressed key lever, as distinguished from the setkeyboard transmitter and perforator equipped ting of the permutation bars in accordance with to disable the perforator during keyboard trans-v a previously depressed keylever. 0 mission if desired, and insure that the first char- The present invention also provides for the opacter perforated after changing to perforating erative association of the keyboard mechanism and perforating transmitting will be the correct with a receiving printer whereby the receiving character and not a perforation of the character printer may be made to respond to the operapreviously set up on the keyboard mechanism. tion of the keyboard transmitter simultaneously S0 The invention contemplates a keyboard mechwith the perforation of a tape. Such an arrangeanism arranged with a plurality of keys operative ment produc s a p nt d py r p di t on pairs of vertically movable permutation bars the perforations in the tape, and allows an operathrough which interference bars of a perforating tor to d erm e a y ndq W r he mechanism are moved selectively to control the perforations in the tape correspond with the operation of punch pins allotted thereto and cormessage d s ed b t a tted wh c will be respondingly perforate a tape. In addition to effected by advancing the perforated tape controlling the position of the interference bars through a tape transmitter. of the perforator, the permutation bars also con- A better understanding of the invention may 35 trol the effectiveness of electrical contacts for be obtained from the following description, taken determining the character of impulses transmit in conjunction with the accompanying drawings ted to a connected line circuit representativemf wherein,

characters to be recorded or reproduced on a re; Fig. 1 is a perspective view showing the assoceiving printer at the distant end of the line ciation of the keyboard perforator mechanism 40 circuit. with a receiving printer;

In some instances, it is desired to transmit im- Fig. 2 is a partial plan view of the keyboard pulses representative of the depression of charperforator-transmitter mechanismof the presacter keys directly tothe line circuit, while in ent invention; other instances it may be more practical to per- Fig. 3 is a detail view of the contact mecha- 5 forate a tape in accordance with the signals to be nism disclosed in Fig. 2;

subsequently transmitted by passing the tape" Fig. 4 is alongitudinal sectional View taken through a tapetransmitter. To provide for the on the line 4-4 of Fig. 2; several possible conditions of operation, a mech- Figs. 5, 6, '7, 8, and 9 are detail views of the anism is arranged to permit the transmission of mechanism for changing the operative relation- 50 impulses directly to the line circuit, the perforaship of the several parts of the apparatus, and 105 tion of a tape, or the operation of these instru- Fig. 10 is a circuit diagram showing the elecmentalities simultaneously. trical connection of the several parts. As previously noted, the permutation bars are Referring now to the drawings in which like arranged-in pairs, are moved vertically in accordreference characters are used to indicate similar 5 ance with the depression of the keylevers, and parts throughout the several figures, there is ll0 shown in Fig, 1 a receiving printer which is indi cated generally by the numeral 11. As shown in this figure, a keyboard 12, to which are attached a character counter 13 and a perforator 14, is operatively associated with the receiving printer 11. It is noted that the keyboard 12 with the counter 13 and the perforator 14 may be removed from the receiving printer as a unit without interfering with the operation of the receiving printer and that power for driving the transmitter is obtained from the driving motor of the printer.

As disclosed in Fig. 2 the keyboard 12 comprises a base casting 15 which may be easily slid in channels in the base frame of the receiving printer 11 to effect the operative association of the keyboard therewith. The keyboard also comprises a pivot rod 16 which extends transversely of and is journalled in the base casting 15. To the pivot rod 16 a plurality of key leversl'l are rotatively mounted which are normally raised by individual springs (not shown), and which are provided, as is usual practice, at'their forward ends with keys 18 arranged in banks.

Beneath the key levers 16 and extending transversely thereof are a plurality of pairs of permutation bars 19. The structure disclosed in the drawings is provided for a 5 unit code, and consequently a corresponding number of pairs of per- -mutation bars 19 are employed. Each pair of permutation bars 19 comprises a bar 20 and a bar 21, and these bars are all provided at each end with vertical slots or notches 22 and 23 which fit over

guide combs

24 and 25 mounted on shafts 28 and 29. The bars 20 and 21 are thus held against longitudinal movement but are free to be shifted vertically. I

Pivotally mounted on the shafts 28 and 29 are pairs of rock arms 26-and 27 interposed between each pair of code bars 20 and 21. The

rock arms

26 and 27 are substantially T-shaped with their free ends, formed with offset lugs on opposite sides of the pivot shafts 28 and 29 and spaced some distance therefrom. One of the lugs of each rock arm. projects forwardly into a notch on the lower edge of the corresponding permutation bar, and its other lug projects rearwardly beneath the lower edge of the corresponding permutation bar. With this arrangement, the depression of either bar of the pair of bars rocks the rocker arms and lifts the associated permutation bar. Connected to each pair of

rock arms

26 and 27 and positioned below the pairs of permutation bars 20 and 21 is a longitudinally movable permutation bar 33. Consequently, when the pairs of permutation bars 20 and 21 are moved in accordance with the depression of the keylevers 17, the permutation bars 33 will be moved longitudinally in a direction corresponding to the setting of the permutation'bars 20 and 21.

Each of the keylevers 17 which extends transversely of the permutation bars 20 and 21 is arranged, when operated, to engage and depress one of the permutation bars of each pair of permutation bars and to set the permutation bars 20 and 21 in a character combination. Preferably to achieve this objective, the upper edges of the permutation bars 20 and 21 are notched to provide high and low portions in accordance with the respective code. Also, the bars of each pair of code bars are complementary; that is to say, each bar is opposite to its mate, and the associated bar has opposite thereto a low portion. The connection between the permutation bars of each pair is such that the simultaneous depression of more than one key lever is prevented. If an attempt is made to operate simultaneously more than one key lever, the key levers can only be depressed part way when they will be blocked by the high portions of the permutation bars.

The perforator disclosed in Fig. 4 comprises a set of punches 37 movable through openings in upper and lower guide plates 38 and 39 and cooperating with a die plate 40 to perforate a tape 41. The

plates

38 and 40 are spaced apart to form a tape guide. The punches 37 are selectively operated by an actuating member or hammer 42 and a set of permutation bars 43 corresponding in number to the punches 37 and the permutation bars 33. Operatively associated with each of the elements 43 is a pivoted member 44 which is connected to the permutation bar 33 by means of a link 45. Thus, upon the permuted setting of the permutation bars 33, the interference elements 43 will be set correspondingly through the movement of the link 45 and the pivoted arm 44.

The hammer 42 oscillates about its pivot and forms the armature of an electromagnet 46. The interference bars 43 are moved back and forth along the face of the hammer 42, and depending upon their selective position the associated punch 37 will be operated. Upon each setting of thevpermutation bars 33, the electromagnet 46 is energized, and the hammer 42 will be oscillated to form a transverse row of perforations in the tape 41 corresponding to the setting of the interference bars 43. The actuated punches 37 are withdrawn from the tape by a spring actuated stripper plate, as is common practice in perforators.

Also, for each operation of the hammer 42 and the punches 37, a row of feed holes adapted to be engaged by the pin teeth of a feed wheel 50 are perforated in the tape. The feed wheel 50 is mounted on a shaft to which there is also secured a ratchet wheel 51 which is adapted to be engaged by a pawl 52 secured to one end of the hammer 42. A spring 53 secured to the pawl 52 serves to restore the pawl and the hammer 42 to their normal or unactuated positions upon the deenergization of the electromagnet 46. When the electromagnet 46 is energized in response to the closure of contacts connected in its energizing circuit, the pawl 52 will be moved vertically against the tension of spring 53 to cause its op erating portion to engage the next succeeding tooth of the ratchet wheel 51. Upon the deenergization of the electromagnet 46, the spring 53 is effective to cause the pawl 52 to move downwardly and thus effect the rotation of the ratchet wheel 51 and the corresponding rotation of the pin wheel 50 to advance the tape 41 to bring an unperforated area thereof in alignment with the punches 37.

Positioned to the rear of the pairs of permutation bars 19 and parallel therewith is a universal bar 55, Fig. 2, which is operated upon the depression of any of the keylevers 17. The bar 55 is connected with a contact operating arm 57 through a connecting link 56, and when operated, which will occur upon the depression of any of the keylevers 17, will cause the closure of contacts 58. These contacts 58, Fig. 3, as will be referred to later in the description with referj ,closed, an energizing circuit for the electromagnet 46 is completed, and the electromagnet is en- ,ergized to perform its function. However, under certain operating conditions, it is desired to reduce the load on the keylevers and lighten the touch for each operation of the universal bar 55, and in order to achieve this result a pivoted member 59 which cooperates with a projection 61 on the pivoted arm 57 is provided. When the pivoted arm 5'7 is moved to the left, as viewed in Fig. 3, in response to the operation of the universal bar 55, the member 59 is latched with the projection 61, and holds the arm 5'7 in its actuated position to maintain the bar 55 in its set position against spring 62. Under these conditions the energizing circuit of the electromagnet is held .open at other contacts. Upon the further movement of the hammer 42, the member 59, which is normally under the tension of a.

spring 60, is operated mechanically through adjustable stud 4'7 to free the projection 61 and allow the restoration of the universal bar 55 to its normal position under the action of a spring 62, Fig. 2. In some instances the member 59 may be used for holding the contacts closed for a period sufficient to insure the complete operation of the hammer 42.

In addition to the universal bar 55, which as previously indicated is operated upon the depression of any of the keys of the keyboard, bar 67, mounted to the rear of the bar 55 is provided. The bar 6'7 as distinguished from the bar 55 is operated only upon the depression of certain of the keys of the keyboard; for example, the special function keys, and as to these keys it is operated in different directions. In the case of the carriage return key, the bar 67 is moved to the right, as viewed in Fig. 2, upon the depression thereof, while it is moved to the left, as viewed in this same figure when the other special function keys allotted thereto are depressed. As was described for the universal bar 55, the bar 6'7 is connected to a link 68, Fig. 3, which in turn is secured to a pivoted, vertically extending arm 69. The arm 69 cooperates with a bank of electrical contacts 70 and serves to operate these contacts variably. The bank of contacts '70 comprises a central contact spring '71 and side contact springs '72 and '73. Normally the contact spring '71 is tensioned in a direction to effect the engagement of the contact carried thereby with the contact secured to the contact spring '72, so that under-normal conditions the contacts carried thereby are in contact, and the circuit controlled thereby is normally completed. Under these conditions, the contact of the spring '73 is normally disengaged, and the circuit controlled thereby is consequently normally open. Secured to the free ends of contact springs '71 and '72 are insulating members '74 and '75, and between these members the upper end of the arm 69 is positioned. When the bar 67 is moved to the left upon the depression of. certain of the special function keys, a corresponding movement of the arm 69 results, and the contact spring '72 is moved sufliciently to effect the disengagement of its contact with the contact secured to spring '71. If the bar 6'7 is moved to the right,-which will result when the carriage return key is depressed, the arm 69 will be moved to the right, as viewed in Fig. 3, resulting in the disengagement of the contacts carried by springs '71 and '72 and the engagement of the contacts secured to springs 71 and '73. The electrical conditions established through the engagement of the contacts carried by the respective contact springs will be described later in connection with the circuit diagram, Fig. 10.

' move the collar 94 along Intermediate the ends of each of the permutation bars 33 is secured a vertically extending member '78 which is provided with a slot '79 to receive the rounded portion of selecting fingers 80. The selecting fingers extend upwardly through an opening in the base 15 and are mounted on a common pivot shaft 81 which is secured to a bracket not shown. The fingers 80 control a set of switch members 82 which are also mounted on a common pivot shaft 83 suitably secured to upright members not shown. At the upper end of each of the selecting fingers 80 a projecting portion'84 is formed which, in accordance with the movement of the permutation bar 33 individual thereto, will be moved into and out of operative relationship with the horizontal arm of the switch control members 82 which are in the form of bell-crank levers. The selecting fingers 80 and the bell-crank levers 82 are held in proper spaced position on their respective pivot shafts.

Each of the bell-crank levers 82 has a hook 85 which cooperates with a contact spring 86 and normally holds the contact spring 86 out of electrical contact with an associated contact spring 8'7. The contact spring 86 is of such a character that it normally tends to engage the contact spring 8'7, but is held out of engagement therewith due to the fact that the bell-crank levers 82 have a projection 88 which cooperates with a cam drum 89. The cam drum 89 is mounted on a horizontal shaft 90 extending transversely of the bell-crank levers 82. The cam drum 89 has cut in its periphery six slots 91 arranged in a helical series so that as the cam drum 89 is rotated the slots 91 will successively cooperate with the projection 88 and provided the bellcrank lever 82 is at that moment free to move will allow its movement and effect the closure of contacts 86 and 8'7 through the medium of which impulses are transmitted to a connected linecircuit, as will be described later. In the normal rest position of the cam drum 89, one of the slots is positioned with respect to projection 88 to allow the contacts carried by the associated springs to be engaged. This results in normally having the line circuit closed through these contacts.

The shaft 90 on which the cam drum 89 is loosely mounted is journalled in two brackets, one of which is indicated by the numeral 93, Fig. 2. The cam drum 89 has secured to it a collar 94, a portion of which is serrated, and is normally urged along the shaft 90 to the right, as viewed in Fig. 5, by the action of a spring 95. Secured to the shaft 90 and arranged to cooperate with the collar 94 is a similarly machined collar 96. The shaft 99 is connected to a source of driving power in a manner such that it is driven continuously, but due to the arrangement of the

collars

94 and 96, which constitute a clutch between the shaft 90 and the cam drum 89, the latter may be selectively rotated.

The spring 95 as previously described tends to the shaft 90 and into engagement with the collar 96, but this action of the spring is normally prevented by means of a pivoted arm 98 Fig. 5 which has a portion thereof spring urged into the path of a shoulder 99 formed on the collar 94. The shoulder 99 is also formed with a gradual camming surface, so that as the collar 94 rotates, it will cooperate with the associated portion of the stop arm 98 and cause the collar 94 to be moved along the shaft 90 against the action of the spring 95 to disengage the serrated portions of the

collars

94 and 96 and stop the collar 94 with its associated cam drum 89. Arm 98 has a horizontal portion 100 which is operatively associated with one arm of a T-shaped lever 101, Figs. 5 and 6, the depending arm of which is pointed as at 102, and which is in the path of a shoulder 103 formed in a member 104. The member 104 is secured to a universal bail 105 which is rotatively mounted on studs 106 and which is rotated upon the depression of any of the keys of the keyboard. The universal bail 105 and the member 104 are normally urged to the position disclosed in Fig. 6 by a spring 104', one end of which is fastened to the member 104, with its other end secured to a stationary bracket.

When the universal bail 105 is depressed, the member 104 against the action of spring 104' will be moved to the left as viewed in Fig. 6, and the shoulder 103 will engage the pointed end 102 of the'T-shaped lever 101 and cause the stop arm 98 to be moved through the depression of portion 100 out of engagement with the shoulder 99 of collar 94. Under these conditions the spring 95 urges the collar 94 to the right, as viewed in Fig. 5, and the serrated portions of the

collars

94 and 96 are brought into engagement, and power from the shaft 90 is communicated thereto to rotate the cam drum 89 through one complete cycle. When the cam drum 89 approaches the end of the cycle of its rotation, the cam surface preceding the shoulder 99 is effective with the stop arm 98 to move the collar 94 against the action of the spring 95 and effect the disengagement of the serrated portion of the collar 94 with that of collar 96.

The universal bail 105 is urged to its normal position by spring 104, Fig. 6, so that the member 104 will likewise be urged to its normal position, and due to the cooperating surface of the member 104 and the vertically extending portion of the T-shaped lever 101, the latter will be restored to its normal position invariably for each operation of the keyboard mechanism. However, in some instances it is desired to continue the rotation of the cam drum 89 for a longer period or for a period sufllcient to transmit successively a plurality of groups of impulses of the same character. In order to achieve this result, there is secured to the space-bar 35 an am 113, Fig. 6, which is in turn fastened to a rod 114. The rod 114 has a horizontally extending portion 115 which normally is in alignment with the downwardly extending portion of the T-shaped member 101. Consequently, when the space-bar 35 is depressed, the rod 114 will be moved to the left, as viewed in Figs. 5 and 6, and the portion 115 will engage the downwardly extending portion of the T-shaped lever 101 and cause its rotation and he corresponding rotation of stop arm 98 for releasing the cam drum 89 for rotation. Notwithstanding the fact that the universal bail 105 is restored to its normal position by spring 104 for each operation of the keyboard mechanism, the T-shaped lever 101 will be held in a position to retract the stop arm 98 from cooperation with shoulder 99, and the cam drum 89 will be rotated through successive cycles as long as the space-bar 35 is held depressed.

Each of the selecting fingers is provided at its upper end with upwardly projecting portions 107, Fig. 4, having bevelled upper edges which cooperate with. a bevelled edge rib on a locking bail 108. The locking bail 108 is pivotally mounted on suitable uprights and a spring tends to depress the locking bail 108 and hold a roller secured to an arm 109 integral with the locking bail 108 in contactwith a lug 110 on the cam drum 89 when the cam drum is in its normal arrested position. Shortly after the cam drum 89 is released for rotation and the lug 110 has been moved free of the roller on the arm 109, the locking bail 108 under the action of its spring is moved about its pivot to bring the bevelled rib into cooperation with the bevelled portions of the projections 107, and consequently lock the selecting fingers 80 in the position in which they are set due to the operation of the permutation bars 33. With such a construction, the permutation bars 33 cannot be operated during the cycle of rotation of the cam drum 89, or until the locking bail 108 is moved by the lug 110 to free the bevelled rib from the bevelled portions of the projections 107 on the selecting fingers 80.

The apparatus as has been described is adapted for the purpose; namely, the perforation of a tape in accordance with the depression of keylevers or the transmission of impulses directly to a line circuit in accordance with such depression. In some instances it may be desired to operate the perforator and the keyboard transmitter simultaneously or individually. In order to make possible the selective operation of the perforator and the keyboard transmitter, mechanism 120 which is mounted on the base frame 15 near the right hand edge thereof as The mechanism 120, the details 01' which are fully disclosed in Figs. 5 to 9 inclusive, comprises a bank of contact springs 121, consisting of contact springs 122, 123, 124 and 125. Each of thesecontact. springs carries contacts through which electrical circuits are completed for variantly controlling the effectiveness of the keyboard transmitter, tape transmitter, and the perforator. The contact springs 123 and 125 have secured at their free ends insulating members which operatively cooperate with the bifurcated portion of a pivoted lever 127. The pivoted lever 127 has three positions, an upper, a middle, and a lower position, as shown in Figs. 5, 7, and 6 respectively, by its cooperation with a bracket 131. With the lever 127 in its uppermost position, or the position shown in Fig. 5, the contact springs 123 and 125 are held against its tension by arms 132 and 133 of member 127, out of electrical contact with the associated

springs

122 and 124. Under these conditions, the apparatus is conditioned for direct keyboard transmission, which will be described further in connection with the circuit diagram shown in Fig.. 10.

When it is desired to operate the apparatus and is held in these respective positions viewed in Fig. 2 is provided.

as a direct keyboard transmitter, which means that the cam drum 89 isreleased for operation upon each depression of the character keysfor the transmission directly to the line circuit of impulses in accordance with the setting of the selector fingers 80 and to perforate simultaneously therewith a tape, the switch member 127 is thrown to its middle position, or the position shown in Fig. 7. in this position, the contact spring-123 cooperates with contact springs 122 for closing through their With the switch member 127 contacts the electrical circuit connected thereto.

It is noted that with the switch member 127 in its middle position, the relationship of the contact springs 124 and 125 remains the same until the next keylever is depressed. In moving the switch member 127 from its upper to its middle position, arm 135 (Figs. 5 and 7) thereof moves free of horizontally extending arm 136 which is integral with member 137 and which is pivoted at 138.

When the arm 135 is moved free of the arm 136, a spring 139 which has one end secured to arm 136 and its other end secured to a bracket 140, moves the member 137 downwardly to a position where a horizontal projecting portion 141 is in the path of an arm 142. The arm 142 is secured to the universal bail 105 and operates upon each rotation thereof so that if the horizontal portion One end of the member 143 is formed at rightangles to the direction of its length and cooperates with the insulating member secured to spring 125 for holding the spring 125 out of engagement with the spring 124. Consequently, when the switch member 127 is moved to its middle position, the relation between the contact springs 124 and 125 is at that instant not disturbed, but upon the subsequent actuation .of the universal bail 105, which will occur on the depression of the next keylever, the arm '142 will move through the horizontal portion 141 of member 137, member 143 against the action of spring 146 and allow the contact spring 125 to move to a position to close its contact with the contact carried by spring 124. In other words, when a keylever 17 is moved from its dotted line position, Fig. 8, to its full line position thereof, the universal bail 105 is rocked about its pivot and causes the arm 142 to move from its dotted line position to the solid line position to effect the movement of

members

137 and 143 from their dotted line positions to the solid line positions. Such a construction insures that the, contacts carried by

springs

124 and 125 will not be closed immediately that member 127 is moved but that their closure is dependent on the operation of a keylever.

With the perforator operating simultaneously with the transmitting cam drum 89, it is desired to eliminate the possibility of repeating the operation of the cam drum 89 when the space-bar 35 is held depressed for a period longer than that required for the cam drum to complete one cycle of rotation. This result is achieved by having the rod 114 bent, as shown more clearly in Fig. 9, and by providing switch member 127 with a projecting portion 150. When the switch member 127 is moved to its middle position, portion 150 ccoperates with the bent portion of rod 114, and the rod 114 is moved against the action of a spring 151 to a position where the projecting portion 115 thereof is out of alignment with the depending portion of the T-shaped member 101. Consequently, when the space-bar 35 is depressed, the portion 115 of the rod 114 will not engage the depending portion of the T'-shaped member 101, and cannot cooperate therewith to hold the stop arm 98 out of cooperative relation with the shoulder 99 of the cam drum 89.

The permutation bars 33 are, as previously described, designed to remain in their set position; that is, they remain in the position previously set until changed as a result of a subsequent depression of a character key, and do not have a normal position. Inasmuch as contacts 58 may at this instant be locked closed by arm 59 and since the contacts carried by

springs

124 and 125 control the energization of the electromagnet 46 of the perforator, the punch pins thereof would be actuated in accordance with the previous setting of the interference bars 43 when the switch' member 127 is moved from its upper to its middle position, resulting in the false perforation of the tape. By arranging the contact spring 125 to be closed upon a subsequent depression of a-' keylever, the electromagnet 46 will not be operated prematurely but will be operated only upon the depression of the next succeeding keylever. With the contacts carried by the

springs

122, 123, 124'- and 125 closed, the apparatus is in a condition to permit the preparationof a perforated tape simultaneously with the transmission of electrical impulses directly to the line circuit and with the switch member 127 in its central position.

For some classes of service it is desired to perforate a tape which may be used subsequentlywith a tape transmitter for the transmission of impulses representative of the perforations without operating the transmitting cam drum 89. .To establish this condition the switch member 127 is moved to its lowermost position, or the position shown in Fig. 6. The operation of the perforator is entirely independent of the operation of card drum 89, and consequently when it is desired to operate only the perforator it is necessary to prevent the release of the cam drum 89 upon the operation of the universal bail 105 which occurs as previously described upon each depression 01' the keylevers. In order to achieve this result, an adjustable bolt 148 is secured to arm 135, and

is in alignment with the member 104 which controls the operation of the stop arm 98 through the T-shaped lever 101. When the switch member 127 is moved to its lowermost position, the bolt 148 moves the member 104 about its pivot 149 so that the shoulder 103 of member 104 is out of alignment with the pointed end 102 of the T-shaped lever 101. With the member 104 moved to this position, the shoulder 103. will not engage the pointed end 102 of the T-shaped member 101 upon the rotation of the universal bail 105. Underthese conditions the stop arm 98 will not be operated, the

collars

94 and 96 will remain disengaged, and the cam drum 89 will not be rotated.

Referring now to Fig. 10 which shows the cir-.

cuit connections of the various units of the apparatus, such as the receiving printer, keyboard transmitter 11-12, the character counter 13 and the perforator 14. In addition to the units just referred to, there is also shown diagrammatically in Fig. 10 a tape transmitter and a rotating distributor indicated generally by the numeral 155. With the switch member 127 in its upper position, or the position shown in Fig. 5, the contact springs 122, 123, 124 and 125 will be in afposition where their associated contacts are out of engagement or in aposition as shown in Fig. 10. Now when the transmitting cam drum 89 rotates,

the switch members 82.will be operated in accordance with the position of the selector fingers 80 and the contact springs 86 and 87 will be operated for transmitting to a line circuit 156 impulses corresponding with the setting of the permutation bars 20 and 21 which control the setting of the selector fingers 80. During the period of direct keyboard operation the arm 59 engages projection 61 of member 57, Fig. 3, and holds contacts 58 closed so that the repeated operation against its spring 62 is prevented which relieves the'load on the keyboard and materially lightens the touch of the keys.-

The line circuit 156 extends through contact 158 of a test key 159, spring 160 thereof, conductor 161, one winding of line relay 162, conductor 163, break contact 164, conductor 165, contact spring 86, contact spring 87, one of which is normally closed, conductor 166,- spring 167 of the test key 159, contact 168 thereof, conductor 169, and to the negative source of battery through segment 199, brushes of arm 182 and segment 205 of unit 155. It is thus seen from the circuit just traced that the line circuit 156 extends through the contact springs 86 and 87 and will be closed or opened depending upon the position of these contact springs, and accordingly impulses will be transmitted to the line circuit 156. However, when the impulses are transmitted directly to line, a send-receive switch indicated generally by the numeral 170 is in the position with respect to its associated contacts shown in Fig. 10. When contact 171 is closed and contact 172 is opened, then circuits are connected for transmission to the line circuit 156 of impulses in accordance with the setting of the selecting fingers of the mechanism. The perforator is not operated since the circuit of the perforator magnet 46 is opened at contacts controlled by switch member 127.

subsequently a keylever is depressed and the circuit controlled by these contact springs is consequently not closed upon the initial operation of the switch member 127. The engagement of the contacts carried by

springs

122 and 123 completes a circuit from the positive terminal 173 of a source of battery, the contacts of

springs

122 and 123, conductor 174, contact 171 of switch 170, conductor 175, contact and switch 176 of the unit 155, switch and contact 177 thereof, the windings of release magnet 178 of a distributing unit 179, and conductor 180 to the negative terminal 181 of the source of battery. Withthis circuit established,

and with the switch 177 in its closed position, or the position shown in Fig. 10, the electromagnet 178 will be energized and the brush arm 182 of the distributor 179 will be released for operation. However, unless it is desired to transmit impulses in accordance with the perforations in a tape, the switch 177 will be opened and will prevent the energization of the electromagnets 178 upon the closure of the contacts carried by

springs

122 and 123. The switch and contact 176 exemplifies the tape stop mechanism which responds to the tension of the tape between the perforator and the transmitter, as is usual practice for preventing the energization of the electromagnet 178 when the tape between the perforator and the transmitter is tensioned to a point to' open the associated contact. Following the described setting of the switch member 127, a keylever of a particular character which is desired to be transmitted to the line circuit 156 and perforated in a tape is depressed to set the permutation bars 33 in a representative combination and control through the interference members 43 and the selecting fingers 80, the perforation of the tape and the transmission of impulses respectively. The universal'bar 55 and the universal bail are also actuated upon the depression of the keylever. Due to the operation of the bail 105 and since the lamp 193 which signals horizontal projection 141 of member 137 has been moved into the path of the arm 142, the member 143 will be moved against thetension of its spring 146 upon the actuation of the universal bail 105, and the contacts carried by the springs 124 and will cooperate with each other for .closing the circuit controlled thereby. When these contacts are closed, an energizing circuit is conditioned for the electromagnet 46 of the perforator which is completed upon the closure of contacts 58. The closure of contacts 58 will occur upon the operation of universal bar 55 which takes place simultaneously with that of bail 105. The circuit for the energization of the perforator electromagnet 46 extends from the positive terminal 173 of the source of battery, the contacts of the

springs

124 and 125, conductor 183, resistances 184, the windings of the electromagnet 46, conductor 185, contacts 58, conductor 186 to the negative terminal 181 of the source of battery. Thus, for each operation of the contacts 58, the electromagnet 46 will be energized for perforating the tape in accordance with the position of the interference bars 43.

The counter13, which is positioned to the right of the machine, as more clearly shown in Fig. 1, and which may be of the construction shown in copending application Serial No. 622,180, filed July 13, 1932, serves to indicate to the operator the number of characters perforated in the tape and indicates the position of the characters with ,respect to the end of a line of printing. Consequently, by observing the position of a pointer 187 with respect to a scale 188 of the counter 13, the operator may quickly note the number of characters perforated in the tape from the beginning to the end of the. line, and can determine the position at which the carriage return key should be depressed for correspondingly perforating the tape to control the connected receiving printer. In order to operate the counter 13 to indicate the condition referred to, an electromagnet 189 is provided which functions for each operation unless its circuit is opened as noted below to cause the advancement of the.

pointer 187 a predetermined amount. The circuit for the electromagnet 189 extends through the contact springs 71 and 72 and the contacts 58. In other words, the contact springs 71 and 72 are so related to the contacts 58, that when the latter contacts are closed for causing the energization of the electromagnet 46, a circuit is likewise completed through the electromagnet 189. This circuit, the energizing circuit for'the electromagnet 189, may be traced from the positive terminal 173 of the source of battery, the contacts carried by the

springs

124 and 125, conductor 183, the windings of the electromagnet 189, conductor 191, contacts carried by the springs 71 and 72, contacts 58, and conductor 186 to the negative terminal 181 of the source of current. For each operation of the contacts 58 an energizing circuit will be completed for the

electromagnets

46 and 189 which will perform their respective functions. When a predetermined number of characters have been perforated in the tape or a number sufiicient to fill a line of printing; a mechanism on the counter 13 is operated to cause the closure of contact 192; the closure of this contact completesa circuit for the operator of the approach of the end of the line. The operator in noting this signal operates the carriage return key for perforating the tape, and in so doing the bar 87, Fig. 2, is moved to theright as viewed therein to cause the contact spring 71 to disengage the contact spring 72 and engage the contact spring 73. With the contacts carried by the springs 71 and 73 in engagement andthe contacts 58 closed through the operation of universal bar 55, an energizing circuit is completed for electromagnet 194 which controls the restoration of the pointer 187 of the counter 13 to its normal or zero position. .The energizing circuit for the electromagnet 194 may be traced from the positive terminal 173 of the source of current, the contacts carried by the

springs

124 and 125,

conductors

183 and 190, the windings of the electromagnet 194, conductor 195, the contacts carried by the springs 73 and 71, the contacts 58, and conductor 186 to the negative terminal 181 of the source of battery.

For the depression of certain of the keylevers 17; such for example as the function keylevers, it is desired to prevent the operation of the counting unit 13. The operation of the counting unit 13 upon the depression of these particular.

keylevers is prevented by having the bar 67 arranged to move to the left upon the depression of these keylevers. When so -moved,' contact spring 72 is moved through the arm 69 to disengage the contact carried by spring 71 and thus open the circuit of the stepping magnet 189 of the counting unit 13. With the circuit open at the contacts carried by springs 71 and 72, the stepping magnet 189 will not be energized upon the closure of contacts 58, and the pointer 187 will accordingly not be advanced.

An operator may desire to operate the receiving printer to record in printed form the message recorded in the tape in perforated form. To provide for this condition, the test key 159 is operated for opening

contacts

158 and 168 and closing the other contacts thereof. When the switch is thrown to close these contacts, the line circuit 156 is disconnected from the transmitter due to the opening of contact 158 and a circuit is completed from the transmitting

contacts

86 and 87 through the line relay 162 which will respond to the operation of

contacts

86 and 87 and cause the operation of the winding of selecting magnet 196 of the receiving printer. Under these conditions the selecting magnet 196 will respond to the closure of the

contacts

86 and 87 in accordance with the setting of the permutation bars 33, and will operate the receiving printer to print in page form the characters corresponding to the characters which are perforated in the tape. The operator can then compare the printed copy as prepared by the receiving printer with the original copy and correct any errors in the tape before it is used for transmission purposes.

Another condition of operation of the apparatus is disclosed wherein the perforator may be operated without operating the keyboard transmitter. To condition the apparatus for this type of operation, the switch member 127 is moved to its lowest position, the position shown in Fig. 6. In moving the switch member 127 to this particular "position, the member 104 is moved through the bolt 148 which is secured to the switch member 127 to a position where it is out of alignment with the pointed end 102 of the projecting portion of the T-shaped member 101. Consequently, when theuniversal bail 105 is operated upon the depression of any of .the keylevers,

the member 104 will not be operated, the stop arm 98 will in turn not be operated, and the cam drum 89 will not be released for rotation. Under these conditions impulses will not be transmitted to the line circuit 156 from the transmitting cam shaft 89,,as was previously described, upon the depression of the character keys.

When the switch member 127 is in its lowermost position, the contacts carried by the springs .122, 123,124, and 125 will be closed; but as to the contacts on the springs 124 and- 125, they will not be closed immediately when the switch member 127 is moved to its lowermost position from its upper position. These contacts will be closed as was previously described when the member 143 is moved to the left as viewed in Fig. 8, due to the engagement of arm 142 with the horizontal projecting portion 141 of member 137. The delay in the closure of the contacts of

springs

124 and 125, as has already been described, serves to prevent the premature operation of the perforator. The circuit for theelectromagnet 460i the perforator as well as the

electromagnets

189 and 194 of the counting mechanism will be closed in accordance with the closure of the circuits controlled by

contacts

58 and 70. In operating the'perforator without operating the keyboard transmitter, the counting unit 13 serves to count the number of characters perforated in the. tape, and to indicate to the operator the approach of the end of a line of page printing. When the end of the line of page printing is reached, as indicated by the pointer 1 187, the carriage return key is depressed, which operates to close the contacts carried by springs 71 and 73 and complete an energizing circuit for the electromagnet 194 to restore the pointer 187 to its normal or zero position.

The system as disclosed in Fig. 10 includes as previously referred to a unit 155 which consists of a tape transmitter 198 and a rotating distributor 179. The tape perforated through the operation of the keyboard perforator may pass directly to the tape transmitter 198 and impulses in accordance with such perforations may be transmitted to the line circuit 156 through the operation of the distributor 179. The system may be operated in this manner with the key 159 in either its line or test position.

With the key 159 in its line position, or the position shown in Fig. 10, the line circuit 156 extends through contact 158, spring 160 of the key or switch 159, conductor 161, one winding of the line relay 162, conductor 163, contacts 164,

the closed contacts of

springs

86 and 87, conductor 166, contact spring 167 and contact 168 of switch 159, conductor 169, the continuous ring 199 of the distributor 179, the brushes and rotating arm 182, and segment 200 to the negative terminal of the battery connected with the movable contacts of the transmitter 198.

For each operation of the contacts 58, the energizing circuit of the release magnet 178 of the distributor 179 is completed, as has been previously described, which permits the brush arm 182 to rotate. As the brush arm 182 rotates in the direction of the arrow, the brushes carried thereby successively engage

segments

200, 201, 202, 203 and 204 which are connected with contacts of the tape transmitter 198, which may be of the type and construction shown in U. S. Patent 1,298,440 to G. R. Benjamin dated March 25, 1919. The contacts of the tape transmitter will be opverated as is well known in the art to apply or disconnect the source of current from the segments 200 to 204 inclusive as determined by the perforations in the tape 41 prepared by the keyboard perforator.

The circuit for the release magnet 178 is completed through the contacts of switches 176 and 177, so that if either of these switches is opened, the circuit for the release magnet 178 will not be completed upon the closure of the contacts of switch 58. If it is therefore desired to discontinue the operation of the transmitting unit 155, either of these switches may be thrown to its open position and thus open the energizing circuit of release magnet 178 and prevent the further operation of thedistributor 179 and the transmission of the impulses to the line circuit 156 in accord ance with the operation of the transmitter 198.

While the invention has been disclosed and de-- scribed as applied to a particular type of appara' tus, it is, of course, obvious that it is capable of other uses without departing from the spirit and scope of the present invention.

We claim:

1. In a telegraph keyboard mechanism, electrical contacts, means for operating said contacts for the transmission of code signals, a perforator, a plurality of keylevers, a; set of code bars movable transversely of their length by said keylevers upon their actuation, means common to said contacts and said perforator and operated by said code bars for effecting the operation of said contacts and perforator simultaneously, and means for permitting the separate operation of said contacts and said perforator.

2 In a telegraph keyboard mechanism, electrical contacts, means for operating said contacts for the transmission of code signals, a perforator, a plurality of keylevers, a set of code bars movable in accordance with the depression of said keylevers and arranged to remain in their set position until changed upon the depression of another keylever, means common to said contacts and said perforator and operated by said code bars for efiecting the operation of said con-' tacts and perforator simultaneously, and means for permitting the separate operation of said contacts and said perforator.

3. In a telegraph keyboard mechanism, electrical contacts, means for operating said contacts for the transmission of code signals, a perforator, a plurality of keylevers, a set of code bars movable upon the operation of said keylevers in varying permutations, and a three-position switch for controlling thedndividualand simultaneous operation of said contact operating means and said perforator.

4. Inc. telegraph keyboard mechanism, electrical contacts, means for operating said con.- tacts for the transmission of code signals, a perforator, a plurality of keylevers, a set of code bars movable upon the operation of said keylevers in varying permutations, a three-position switchincluding means for rendering said perforator non-operative with said switch in one of its positions, and .means operative with said switch in one of its other positions for mechanically preventing the operation of said contact operating means.

5. In a telegraph keyboard mechanism, electrical contacts, means for operating said contacts for the transmission of code signals, a perforator, a plurality of keylevers, a set of code bars movable upon the operation of said keylevers in varying permutations, means for continuing the operation of said contacts in accordance with the setting of said code bars, means for controlling the individual and simultaneous operation of said contact operating means and said perforator, and means operative when said last mentioned means is actuated to make possible theindividual operation of said perforator for rendering said means for continuing the operation of said contact operating means ineffective.

6. In a. telegraph keyboard mechanism, a set of elements, corresponding pairs of code bars for conditioning said elements in different combinations, a plurality of keys arranged to move the bars of every pair transversely of their lengths in opposite directions and selectively condition all of said elements, means controlled by said elements for perforating a tape, and other means controlled by said elements for controlling the transmission of impulses directly to a line circuit.

7. In a keyboard mechanism for telegraph apparatus, pairs of complementary code bars, one pair for each element of a code, a plurality of keys arranged to move positively the bars of every pair transversely of their lengths in opposite directions and thereby selectively condition all of said code bars, means controlled by said code bars for perforating a tape, and other means also controlled by said code bars for controlling the transmission of impulses directly to a line circuit.

8. In a telegraph system, a receiving printer, a keyboard mechanism including electrical contacts, means for operating said contacts for the transmission of code signals, a perforator, a plurality of keylevers, a set of code bars movable transversely of said keylevers in the direction of their length upon their actuation, means common to said contacts and said perforator and operated by said code bars'forfeffecting the operation of said contacts and perforator simultaneously, and means for causing said receiving printer to respond to the operation of said contacts simultaneously with the operation of the perforator.

9. In a. telegraph keyboard mechanism, electrical contacts, means for operating said contacts for the transmission of code signals, a perforator, a plurality of keylevers, a. set of code bars actuated by said keylevers upon their depression, means common to said contacts and perforator for effecting their simultaneous operation, means for permitting the separate operation of said contacts and perforator, and means. efiective for relieving said keylevers of the load incident 'to the operation of the perforator when said contacts are operated separately.

10; In a telegraph keyboard mechanism, electrical contacts, means for operating said contacts for the transmission of code signals, a perforator a plurality of keylevers, a. set of code bars actuated by said keylevers upon their depression, means common to said contacts and perforator and operated by said code bars for effecting their simultaneous operation, means for permittingthe separate operation of said contacts and perforator, a universal bar operated upon the depression of said keylevers for controlling the operation of said perforator, and means operated when said contacts are operated separately for relieving said keylevers oi the load incident to the operation of said universal bar.

11. In a telegraph keyboard mechanism, electrical contacts, means for operating said contacts for the transmission of code signals, a perforator, a plurality of keylevers, a set of code bars movable upon the operation of said keylevers in varying permutations, a bank of contacts, circuit connections established through said contacts for determining the effectiveness of said perforator and said electrical contacts for the transmission of code signals, and a switch member for controlling the operation of said contacts for the individual and simultaneous operation of said contact operating means and said perforator.

12. A telegraph keyboard comprising a plurality of permutation bars, means for moving said bars transversely of their length,- an element moved longitudinally by said bars; a switch member located intermediate the ends of said bars, a plurality of levers for controlling the movements of said switch member under the control of said elements, a plurality of cams for operating said levers in succession, a tape perforator adjacent one end of said bars, and means operated through said elements for controlling the selective operation of said perforator. 1

13. A telegraph keyboard comprising a plurality of permutation bars, means for moving said bars transversely of their length, an element moved longitudinally by said bars, a switch member located intermediate the ends of said bars, a plurality of levers for controlling the movements of said switch member under the control of said elements, a plurality of cams for operating said levers in succession, a tape periorator adjacent one end of said bars, means operated through said elements for controlling the selective operation of said perforator, and means for controlling the individual and simultaneous operation of said cams and said perforator.

14, In a keyboard telegraph transmitter, a plurality of keylevers, a, cyclically operable transmitting element, means cooperating with said element for preventing its operation beyond a certain point, means operated upon the depression of a keylever for actuating said means and permitting said element to complete one cycle, separate means actuated upon the depression of a particular keylever to render said cooperating means inefiective to arrest said element for each cycle of movement, and means for disabling said separate means under certain operating conditions.

15. In a telegraph keyboard mechanism, electrical contacts, a rotary element for operating said contacts for the transmission of impulses, a stop engaging said element to prevent its rotation, a plurality of keylevers, a set of code bars actuatedlby said keylevers upon their actuation for determining the operation of said contacts by said rotary element, means operated with said code bars for releasing said stop to allow said rotary element to complete one cycle, a perforator, means common to said perforator and said contacts for effecting the operation of said contacts and perforator simultaneously, means for permitting the separate operation of said contacts and perforator, and separate means effective in accordance with said last mentioned means and operated upon the depression of a particular keylever for permitting said element to rotate continuously.

16. In a telegraph mechanism, an electrical contact means for operating the contact for the transmission of code signals, a perforator, a plurality of keylevers, a set of code bars movable upon the operation of the keylevers in varying permutations, and a three-position element for controlling the individual and simultaneous operation of said contact operating means and said perforator.

17. In a telegraph system, areceiving printer, a keyboard unit mounted with said printer including means for generating electrical signals, a perforator, a plurality of keylevers, a set of code bars movable upon the actuation of the keylevers, means for permitting either the individual or.simultaneous operation of said electrical signal generating means and said perforator, and means for causing said printer to respond to the operation of said signal generating means simultaneously with the operation of the perforator.

18. In a telegraph keyboard mechanism, electrical contact means, means for operating said 10 contact means for the transmission of code signals, a perforator, a plurality of keylevers, a set of code bars actuated by said keylevers upon their depression, means operated by the code bars for effecting the actuation of said contact means and perforator, means for permitting the separate operation of said contact means and perforator, a universal member operated upon the depression of said keylevers for controlling the operation of said perforator, and means operated when said contact means is operated separately for relieving said keylevers of the'load incident to the operation of said universal member.

CHARLES w. BURCKY. ALBERT H, REIBER.