US1965602A

US1965602A - Keyboard perforator transmitter

Info

Publication number: US1965602A
Application number: US649678A
Authority: US
Inventors: Ross A Lake
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

Jul y10, 1934. R. A. LAKE 1,965,602

KEYBOARD PERFORATOR TRANSMITTER Filed Dec. 31. 1932 4 Sheets-Sheet 1 July 10, 1934. R. A.'LAKE KEYBOARD PERFORATOR TRANSMITTER Q iled Dec. 31, 1932 4 Sheets-Sheet 2 INVENTOR PQSS-ALLA/ff 12 16 14? M ATT RN Y July 10, 1934. E 1,965,602

' KE'gB ARb PERFORATOR TRANSMITTER Filed Dec. 31. 1952 4Sheets-Sheet 5 INVENTOR P055 ,4. LAKE ATI'ORN July 10, 1934. V V QAYL-EAKE 1,965,602 I KEYBOARD PERF'oRA'foR' TRANSMITTER Filed Dec. 31. 1932 4-Sheets-Sheet' 4 7 INVENTOR R055 A LAK A'ITOR Y Patented July O, 1 934 PATENT OFFICE 1,965,602 KEYBOARD BERFORATOR TRANSMITTER Ross A. Lake, Chicago, Il1., assignor to Teletype- Corporation, Chicago, 11]., a. corporation of Delaware Application December 31, 1932, Serial No. 649,678

1 11 Claims. (01. 178-17) This invention relates to printing telegraph apparatus, and more particularly to a keyboard actuated mechanism for the direct transmission of electrical impulses and/or the perforation of a tape. I

An object of the invention is the provision in a compact, extremely simple, and unitary keyboard apparatus capable of direct transmission and/or' the perforation of a tape, of mechanism for insuringthe perforation of the correct character code on a change of the apparatus from direct transmission to perforating operation.

The present invention contemplates for. the attainment of the above and other objects of the invention, a keyboard mechanism arranged with aplurality of keys'operatively associated with pairs of vertically movable permutation barsthrough which interference bars of a perforating mechanism are moved selectively to control the operation of punch pins allotted thereto and correspondingl'y perforate a tape. In addition to the control of the interference bars of the perforator, the'permutation bars have a dual function; namely, the control of the effectiveness of electrical contacts for determining the character or polarity of impulses transmitted directly to line upon the rotation of an intermittently rotatable cam shaft.

In some instances it is desired to transmit im-' pulses representative of the depression of character keys directly to a line circuit, while in other instances it may be more practical to perforate a.

tape in" accordance withthe signals to be subsequently .transmitted by subjecting the tape to a tape transmitter. To provide for the several possible conditions of operation, a'mechanism is arranged in the keyboard apparatus to permit the transmission of impulses directly to the line circuit, the perforation of a tape or the operation of the contact transmitter and the perforator simultaneously.

According to the preferred embodiment of the present invention, the/ permutation bars are moved vertically upon the depression of the keylevers, and remain-in their set position until subsequently changed as a result of the depression of another keylever. Under these conditions, the interference bars of the perforator remain in their set position, and to guard against the possibility of operating the interference bars for the corresponding perforation of the tape prematurely, the mechanism embodies an element responsive to the depression of the character keys when other parts of the mechanism are in a predetermined position for preventing the premature operation of the perforator and insuring that the group of perforations appearing in the tape following a change from direct keyboard transmission to tape perforating will be representative of the setting of the permutation barsin accordance with the depression of the subsequently depressed keylever, as distinguished from the setting of the permutation bars by a previously depressed keylever.

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

Fig. 1 is a partial plan view of the keyboard perforator transmitter mechanism of the present invention; 4

Fig. 2 is a detail view of the contact mechanism disclosed in Fig. 1;

- the several parts of the apparatus, and;

Fig. 8 is a circuit diagram showing the electrical connection of the keyboard transmitter perforar Fig. 1, and suitably journaled thereto is a pivot rod 1'7 which extends transversely of the casting. To the pivot rod 17 a plurality of keylevers 18 are rotatably mounted which are normally raised. by individual springs not shown and which are provided, as is the usual practice, at their forward. ends with keys 19 arranged in banks.

Beneath the keylevers l8, and extending transversely thereof, are a plurality of pairs of permutation bars 20. The structure disclosed in the drawings is provided for a 5-unit code, and consequently a corresponding number of pairs of permutation bars 20 are employed. Each pair of permutation bars 20, Fig. 3, comprises abar 21 and a bar 22, and these bars are all provided at each end with vertical slots or notches 23 and'24. which fit over guide combs 25 and 26 mounted on rods 28 and 29. The bars 21 and '22 are thus held against longitudinal movement, but are free to be shifted vertically'in response to the operation of keylevers 18 about pivot s it 17.

Pivotally mounted on

shafts

2 and 29 are pairs 11o edge of the corresponding permutation bar, and 1 its other lug projects rearwardly beneath the lower edge of the correspondng permutation bar.

With this arrangement, the depression of either permutation bar of the pair of bars 20 rocks the arms '30 and 31, and lifts the associated permutation her. To the straight portion of the T-shaped rock arms 30 and 31, and positioned below the

permutation bars

21 and 22 is a longitudinally movable permutation bar32. With this arrangement, when the

permutation bars

20 and 21 are moved vertically in accordance with the depression of .a keylever 18, the permutation bar 32 individual to a pair of the

permutation bars

21 and 22 is moved longitudinally, or in the direction of its length.

Each of the keylevers 18 is arranged when depressed to engage and depress one of the permu-' tation bars of each pair of permutation bars and to set these permutation bars in a character combination. Preferably to achieve this objective the upper edges of the

permutation bars

21 and 22 are notched to provide high and low portions in accordance withthe respective code. Also, the bars of each pair of code bars are complementary; that is, each bar is opposite to its mate, and the associated bar has opposite thereto a low por-' tion. The connection between the bars of each pair of bars by means of the rock arms 30 and 31 prevents the simultaneous depression of two keylevers. If an attempt is made to operate more 3 than one keylever, the keylevers can only be depressed a short distance, when they will .be blocked by the high portions of the permutation bars. By such a construction the simultaneous depression of two keylevers and the transmission of an incorrect signal are prevented.

The perforator disclosed in Fig. 3 comprises a set of code punches 35. movable'through an opening in upper and lower guide plates 36 and 3'? and cooperates with a die plate 38 to perforate a tape 39. The plates 36 and 38 are spaced apart to form a tape guide. The punches 35 are selectively operated by an actuating member or hammer- 40 and a set .of interference bars 41 correspending in number to the punches 35 and the permutation bars 32 are provided. Operatively associated with each of the bars 41 is a pivoted .arm 42 which is connected to the permutation bar 32 by means of a link 43. Upon the permuted setting of the permutation bars 32 the interference bars 41 will be set correspondingly through the movement of the link 43 and the pivoted arm 42.

The hammer 41 oscillates about its pivot, and forms thearmatu're of an electromagnet 44. The interference bars 41 are moved back and forth along the face of the hammer 40, and depending upon their selective position the associated punch 35 will be operated. .Upon'each permuted setting of the permutation bars 32 the electromagnet 44 will be energized, and the hammer 40 will be oscillated to form a transverse row of perforations in the tape 39 corresponding to the setting of the interference bars 41. punches 35 are withdrawn from the tape by a spring actuated stripper plate, as is common practice in perforators.

'Also, for each operation of the hammer 40 The actuated and the punches 35, a row of feed holes adapted to be engaged by the pin teeth of a wheel 45 are perforated in the tape. The feed wheel 45 is mounted on a shaft to which there is also secured a ratchet wheel 46engaged by a pawl 47 pivotally mounted to a projecting portion of hammer 40. A spring 48 fixed at one end to a stationary pin, and at the other end to a portion of the pawl 47 serves to restore the hammer with the pawl 47 to their normal or unactuated position. When the electromagnet 44 is energized in response to the closure of an electrical circuit, which will be described later, the hammer 40 is rotated about its pivot, and the pawl 47 is moved vertically to engagethe next succeeding tooth of the ratchet wheel 46. Upon the deenergization of the electromagnet 44, the spring 48 is effective for restoring the hammer 40'and the pawl 47 to their normal position, whereby the ratchet wheel 46 will be rotated through a distance corresponding to the distance between its teeth and advance the tape 39 to bring an unperforated areaof the tape in alignment with the punches 35.

Positioned to the rear of the permutation bars 20is a universal bar 49, Fig. 1, which is operated upon thedepression of any of the keylevers 18. The bar 49 is connected. to a contact operating arm 50 by a link 51', and when operated, which will occur upon the depression of any of the keylevers 18, will cause the closure of contacts 52.-

These contacts 52, Fig. 2, as will be referred to later in the description, particularly with reference to the circuit diagram Fig. 8, are connected in the energizing-circuit of the electromagnet 44. When these contacts are closed, an energizing circuit for the electromagnet 44 is completed, and it'is energized to perform its previously described function. However, under certain operating conditions, especially when the apparatus is being used for direct keyboard transmission, it is desired to reduce the load on the keylevers and lighten the touch for each operation of the universal bar 49, and in order to achieve this result a pivoted latch 53, Fig. 1, which cooperates with a projection 54 on the pivoted arm 50 is pivoted arm 50 is moved to the left, as viewed in Fig. 2, in response to the operation of the universal bar 49, the latch 53 cooperates with projection 54 and holds the arm 50 in its actuated provided. When the position to maintain the universal bar 49 in its set position against the action-of its retractile spring 55. Under these conditions, the energizing circuit of the electromagnet is held open at other contacts. Upon the further movement of hammer 40, the latch 53 is operated mechanically through the adjustable stud 56 against the tension of a return spring 57 to free the latch 53 from the projection 54 and allow the restoration of the universal bar 49 to its normal position by spring 55. In some instances the latch 53 may be used for holding the contacts closed for a period suflicient to insure a complete operation of the hammer 40.

In addition to the universal bar 49, which is operated upon the depression of any of the keylevers- 18, a bar59 is mounted to the rear of the bar 49. The bar 59, as distinguished from the bar 49, is operated only upon the depression of certain of the keyleve rs; for example, the special function keys, and as to these keys it is operated as viewed in Fig. 1, upon the depression thereof, it

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 .49, the bar 59 is connected to a link 60, Fig. 2, which in turn is secured to a pivoted vertically extending arm 61'. The arm. 61 cooperates with a bank of electrical contacts 62 comprising a central contact spring 63 and side contact springs 64 and 65. Normally the contact spring 63 is tensioned in'a direction to effect the engagement of the contact carried thereby with the contact mounted on spring 65, so that under normal conditions the contacts carried thereby are in contact and the circuit extended therethrough is completed. Under these,conditions, the contact of spring 64 is normally disengaged, and the circuit controlled thereby is consequently open.

Secured to the free end of-each of the contact springs 63 and 65 is an insulator 66 and 67 respectively, and between these insulators the upper end of the arm 61 is positioned. When the bar 59 is moved to the left upon the depression of certain of the special function keys, a corresponding movement of the arm 61 results, and the movement is suflicient to effect the disengagement of its contact with the contacts secured to spring 65. If the bar 59 is moved to the right, which will result when the carriage return key is depressed, the arm 61 will be moved to the right, as viewed in Fig. 1, causing the disengagement of the contacts carried by springs 63 and and the engagement of the contacts secured to

springs

63 and 64. The electrical conditions established through the engagement of the contacts carried by the respective contact springs 63, 64, and 65 will be described later inconnection with the circuit diagram Fig. 8.

Intermediate the ends of each of the permutation bars 32 is secured a vertically extending member '70, Fig. 3, which is provided with a slot to receive the rounded portion of selecting fingers 71. 'The selecting fingers 71 extend upwardly through an opening in the base 15, and are mounted on a common pivot shaft 72 which is secured to a bracket not shown. The fingers 71 control a set of switch members '73 which are also mounted on a common pivot shaft 74 suitably secured to upright members not shown. At the upper end of each of the selectingflngers 71 a projecting portion 75 is formed, which in accordance with the movement of the permutation bar 32 individual thereto will be moved into or out of operative relationship with a horizontal arm of the switch control members '73 which are in the form of bell crank levers. The selecting-fingets 71 and the bell crank levers '73 are held in proper spaced position on their respective pivot shafts. I

Each of the bell crank levers '13 has a hook '16 which cooperates with a contact spring 77 and normally holds the contact spring out of electrical contact with an associated contact spring '78. The contact spring-77 is of such character that it normally tends to engage the contact spring '78, but is held out of engagement therewith due to the fact that the bell .crank levers 76 have a projection 79 which cooperates with cam drum '80. The cam drum is mounted on a horizontal shaft 81 extending transversely of the bell crank levers '73. The cam' drum 80 has in its periphery six slots 82 arranged in a helical series. so that as the cam drum 80 is rotated the slots 82 will successively cooperate with the projection 79, and

' provided the bell crank lever 76 is at that moment free to move will allow its movement and effect the closure of

contacts

77 and 78 through the medium of which impulses are transmitted to a connected line circuit. In the normal rest position of the cam drum 80, one of the slots is positioned with respect to the projection 79 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 81 on which the cam drum 80 is loosely mounted journaled in two brackets,1one of which is labeled 85, Figs. 1 and 4. The cam drum 80' has secured to it a collar 86, a portion of which is serrated, and is normally urged along the shaft 81 to the right, as viewed in Fig. 4, by a spring 87. Secured to the shaft 81, and arranged to cooperate with the collar 86, is a siiniiarly machined collar 88. The shaft 81 is connected to a source of driving power in a manner such that itis driven continuously, but due to the arrangement of the

collars

86 and 88, which constitute a clutch between the shaft 81 and the cam drum 80, the latter may be selectively rotated.

The spring 87 tends to move the collar 86 along the shaft 81 and intoengagement with the collar 88, but this action of the spring is normally prevented by means of apivoted arm 89, Fig. 4, which 'has a portion thereof spring urged into the path of a shoulder '90 formed; on the collar 86. The shoulder is also formed with a gradual 'camming surface, so that as the collar 86 rotates it will cooperate with the associated portion of the stop arm 89 and cause the collar 86 to be moved along the shaft 81 against the action of spring 87' to disengage the serrated portions of the

collars

86 and 88 and stop the rotation of collar 86 with its associated camdrum .80. Arm 89 has a horizontal portion 91 which is operatively associated with one arm of a' T- shaped lever 92, Figs. 4 and 6, the depending arm of which is pointed as at, 93, and which is in the path of a shoulder 94 formed in a slidable member 95. The member 95 is secured to a universal bail 96 which is rotatably mounted on studs 97, and which is rotated upon the depression of any of the keys of the keyboard. The universal bail 96 and the member 95 are normally urged to a position disclosed in Fig. 6 by a spring 98, one end of which is fastened to the member 95 and its other end is secured to a stationary bracket. When the universal bail 96 is depressed, the member 95 against the action of spring 98 will be moved to the left as viewed in Fig. 6, and the shoulder 94 will engage the pointed end 93 of the T-shaped lever 92 and cause the stop arm 89 to be moved through the depression of portion 91 out of engagement with the shoulder 90 of collar 86. Under these conditions the .spring 87 urges the collar 86 to the right, as

viewed in Fig. 4, and the serrated portions of the

collars

86 and 88 are brought into engagement and the power from-shaft 81 is communicated thereto to rotate cam drum 80 through one complete cycle. When the cam drum 80 approaches and the vertically extending portion of the T- shaped member 92, 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 80 for a longer period, or for a period sufiicient to transmit successively a pluraldepressed, the rod 100'will be moved to the 1 ft,

' as viewed in Figs. 4 and 6, and the portion 01 will engage the downwardly extending portion of the T-shaped member 92 and cause its rotation and the corresponding rotation of stop arm -89' for releasing the cam drum 8010i. rotation.

Notwithstanding the fact that the universal bail 96 is restored to its normal position by spring 98 v for each operation of the keyboard mechanism,

the T-shaped lever 92 will be held in a position to retract the stop' arm 89 from cooperation with shoulder 90 and the cam drum 80 will be rotated ;through successive cycles as long as the space bar 34 is held depressed.

Each of the selecting fingers 71 is provided atrits upper. end with an upwardly projecting portion 104, Fig. 3, having beveled upper edges which cooperate with a beveled edge rib on a locking bail 105. pivotally mounted on suitable uprights,

The locking bail 105 is and a spring tends to depress the bail and hold a roller secured to an arm 106 integral with the locking bail 105 in. contactwith a lug 107 on the cam drum" 80 when the cam drum is in its normal, arrested position. Shortly after the cam drum 80' is released for rotation and the lug 107 has been moved tree of the roller on arm 106', the locking bail '105 under the actionof its spring is moved' about its pivot to bring the beveled rib into cooperation with the beveled portions of the projections 104 and consequently lock the selecting fingers 71 in the position in which they were rotation of the cam drum 80,- or until the locking bail 105 is-moved by big '10? to free the beveled ribfrom the beveled portions of the projections 105 on the selecting fingers 71.

Theapparatus as has been described is adapted-tor the purpose; namely, the perforation or a tape in accordance with the depression of keylevers or the transmission of impulses directly toe. line circuit in accordance with such to operatefithe perforator and the keyboard simultaneously or individually. In order to make possible the selective operation of the perforator and the keyboard transmitter, a mechanism 110 which is mountedon the base frame 15 near the right hand edge thereof as viewed-in Fig. 1 is provided. The mechanism 110, the details of which are fully disclosed in Figs. 4 to '7 inclusive. comprises a bank of contact springs 111 consisting of contact springs 112, 113, 114 and 115. Each of these contact springs carries contacts through which electrical circuits are completed for variantly controlling the effectiveness of the-keyboard transmitter and the perforator. The contact springs 113- and 115 have secured arm 126 engages the some instances it may be desired at their free ends insulating members which operatively cooperate with the bifurcated portion ,114. 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. 8.

When it is desired to operate the apparatus as a direct keyboard transmitter, which means that the cam drum is released for operation upon each depression of the character keys for the transmission directly to the line circuit of impulses in accordance with the setting of the selecting fingers 71 and to-perforate simultaneously therewith a tape, the switch member 116 is moved to its middle position, or the position shown in Fig. 7. With member 116 inthis position, the contact spring 113 cooperates with contact spring 112 for closing through their contacts the electrical circuit connected thereto. It is noted-that with the switch member 116 in its middle positionthe relationship of the contact springs 114 and 115 remains unchanged until the next keylever is depressed.

In moving the switch member 116 from its upper to its middle position, arm 120, Figs. 4 and 6 thereof moves free of horizontally extending arm 121' which is integral with member 122 pivoted atl09. When the arm 120 is moved free of the arm 121, a spring 123 which has one end secured to the arm 121 and its other end secured to a bracket 124 moves the member 122 with the arm 121 downwardly'to a position where a horizontally projecting portion 125 is in the path of an arm 126. The arm 126 is secured to the uni-1' versal bail 96, and operates upon each rotation thereof, so that if the portion 125 of member 122 is in its path the member 122 will be moved to the left, as viewed in Figs. 4 and 7. Inasmuch as the member 122 is connected at 109 to a member 127 which is slotted at 128 and 129 to allow its movement against the action of a-spring 130 Fig. 5, and which has secured to it bracket 124, it will be moved when the upperend of horizontal projection 125 and is moved.

One end of the member 127 is formed at right angles to the direction of its'length, and cooperates with an insulating member secured to spring 115 for holding that spring out of engagement with its cooperating spring 114. Consequently,

when the switch member 116 is moved to its middle position, the relation between contact springs 114 and 115 is at that instant not disturbed, but upon the subsequent actuation of universal bail 96, which will occur on the depression of the next keylever, arm 126 will move through the horizontal portion 125 of member 122 member 127 against the action of spring 130 and allow the spring 115 to move to a position to close its contact with the contact carried by spring 114. In other words, when a keylever 18 is, moved from its dotted line position, Fig. 5, to its'full line position thereof, the universal bail 96 is rocked about its pivot 97, and causes the arm 126 to 've from its dotted line position to the solid line position to efiect the Such a construction insures thatthe contacts car ried by

springs

114 and 115 will not-be closed immediately that switch member 116 is moved, but

that their closure is dependent on the operation of a subsequent 'keylever.

With the perforator operating simultaneously with the transmitting cam ,drum 80, it is desired to eliminate 'the possibility'of repeating the operation of the cam drum when the space bar 34 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 rod 100 bent as shown more clearly in Fig. 6,and by providing switch member 116 with a projecting portion 133. When the switch member 116 is moved from its middle position, portion 133 00- operates with the bent portion of rod 100 and the rod 100 is moved. against the action of a spring. 13.4, Fig. 1, to a position where the portion 101 thereof is out of alignment-with-the depending portion of the T-shaped member 92.

Consequently, when the space bar 34 is depressed, the portion 101 of the rod 100 will not engage the depending portion of the T-shaped member 92 and cannot cooperate therewith to hold the stop arm 89 out of cooperative relation with the shoulder of the cam drum 80.

Thepermutation 'bars 32 are, as previously de-,

scribed, 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 52 may at this instant be locked closed by latch 53, and since the contacts carried by

springs

114 and 115 control the energization of the electromagnet 44, the punch pins thereof will be-actuated in accordance with the previous setting of the interference bars 41 when the switchmember 116 is moved from its upper to its middle position, resulting in the false perforation of the tape. By arranging the'contact spring 115 to be closed upon a subsequent depression of a keylever, the electro-magnet 44 will not be-operated prematurely, but will be operated only upon the depression'of the next succeeding keylever. With the contacts carried by

springs

112, 113, 114, and 115 closed and with the switch member .116 in its central position, the apparatus is in a condition to permit the perforation of tape simultaneous with the transmission of electrical impulses directly to the line circuit. 1

For some classes of service it is desired to perforatea tape which may be used subsequently with a tape transmitter for the transmission of impulsesrepresentative of, the perforations without operating the transmitting cam drum 80. To establish this condition, the switch member 116 is moved to its lowermost position, or the position shown in Fig. 6. The operation of the perforatoris entirely independent of the operation of cam drum 80, and consequently when it is desired to operate only the perforator it is necessary to prevent the release of the cam drum 80 upon the operation of the universal bail 96, which occurs as previously described upon each depression of the keylevers. To achieve this result, an adjustable bolt 136 is secured to arm 120 of switch member 116 and is in alignment with member which controls the operation of stop arm 89 through theT-shaped lever 92, When the switch member. 116 is moved to its lowermost position,

so that the shoulder 94 of member 95 is out of alignment-with the pointed end 93 of the T- shaped member 92. With the member 95 moved to this position, the shoulder 94 will not engage the pointed end 93 of the T-shaped member 92 upon the operation ofthe universal bail 96, even though the "bail is operated invariably for each depression of the keylevers. Under these conditions the stop arm 89 will not be operated, and

collars

86 and 88 will continue to be out of driving connection.

v Referring now to Fig. 8 which shows the circuit connections of the various units of the ap paratus such'as a receiving printer 11, a character counter 10, a transmitter 12, and a perforator 13. With the switch member 116 in its upper position, or the position shown in Fig. 4, the contact springs 112, 113, 114, and 115 will be in a position where their associated contacts are out of engagement, or in the position shown in .Fig. 8. Now, when the transmitting cam drum 80 rotates, the switch members '76 will be operated in accordance with the position of the selector finbe operated for transmitting to a line circuit 140 impulses corresponding to the setting of the permutation bars'21 and 22 which control the setting of the selector fingers 71. During the period of direct keyboard operation, the latch 53 engages projection 54 of member 50, Fig. 2, and holds contacts 52 closed so that the repeated operation of member 50 against its'spring 55 is prevented, which relieves the load on the keyboard and materially lightens the touch of the keys.

The line circuit 140 extends through'contact 141 of a test key 142, spring 143 thereof, conductor 144, one winding of line relay 145, conductor 146, break contact 147, conductor 148, contact springs '77 and 78, one of which is normally closed, spring 149, and contact 150 of test key 142 to the oppositeterminal of the source of signalling current. It is thus seen from the circuit just traced that the line circuit 140 extends through the contact springs 77 and 78, and will be closed or opened depending upon the position of these contact springs and accordingly impulses will be transmittedto the line circuit 140. However, when the impulses are transmitted directly to line, a

send-receive switch indicated generally by the numeral 151 is in the position with respect to its associated contacts shown in Fig. 8. When contacts 152 are closed, and contacts 153 are open circuits are connected for the transmission to the line circuit 140 of impulses in accordance with the setting of the selecting fingers 71 of the keyboard mechanism. The perforator is not operated for these conditions, since its circuit is opened at contacts controlled by switch member 116.

If it is desired to operate the perforator 13 simultaneously with the transmission of impulses directly to the line circuit 140, the switch member 116 will be moved to its middle position. When so moved, contact spring 113 is allowed to move to a position where its contact engages the contact of spring 112 and closes a circuit therethrough. However, contact springs 114 and 115 are retained separated until subsequently a keylever is depressed and the circuit controlled by terminal 154 of a source of battery through the contacts of springs 112- and 113,'conductor 155,

circuit 140 and simultaneously perforated in a.

tape is depressed to set the permutation bars 32 in, a representative combination and control through the interference members 41 and the selecting fingers 71 the perforation of the tape 39 and the transmission of impulses directly to the line circuit 140 respectively. Due to the operation of the bail 96 and since the horizontal projection. 125 of member 122 has been moved into the pathof arm 126, the member 127 will be moved against the tension of its spring 130 upon the actuation of the universal bail 96, and the contacts carried by

springs

114 and 115 will cooperate with each other for closing the circuit controlled thereby. When these contacts are closed, an energizing circuit is conditioned for the electromagnet 44 of the perforator, which is completed upon the closure of contacts 52. The closure of contacts 52 will occur .upon the operation of universal bar 49, which takes place simultaneously with that of bail 96. The circuit for the energization of the electromagnet 44 extends from the positive terminal 154 of the source of battery through the

contacts

114 and 115, conductor 158, resistances 159, the windings of elec-' tromagnet 44, conductor 160, contacts 52, conductor 161, to the negative terminal 157 of the source of battery. Thus, for each operation of contacts 52, the electromagnet 44 will be energized for perforating the tape in accordance with the position of the interference bars 43.

The counter 10 which is positioned to the right of the machine, 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 with respect to a scale of the counter 10, as fully disclosed in the copending application referred to,-the operator can 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 10 to indicate the condition referred to, an electromagnet 1'62.is provided, which functions for each operation unless its circuit is opened, as noted below, to cause the advancement of the indicating pointer a predetermined amount. The circuit for the electromagnet 162 extends through the contact springs '63 and of the bank of springs 62 and the contact springs 52. In other words, the contact springs 63 and 65 are so related to the contacts 52 that when the latter contacts are closed for causing the energization of the electromagnet 44, a circuit is likewise completed through the electromagnet 162. Upon the completion of the energizing circuit for the electromagnet 162, it is energized and causes the associated pointer to move over the scale for indicating the number of characters. When a predetermined number of characters have been perforated in the tape, or a number sufficient to fill a line of printing, a mechanism on, the counter 10 is operated to cause the closure of contact 16 The closure of this contact completes the circuit for a lamp 164, which signals 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 59, Fig. 1, is moved to the right as viewed therein to cause the contact spring 63 to disengage contact spring 65 and engage contact spring 64. With the contacts carried by the

springs

63 and 64 in engagement, and the contacts 52 closed through the operation of .the universal bar 49, an energizing circuit is completed for electromagnet 165 which controls the restoration of the pointer of the counter 10 to its normal or zero position. The energizing circuits for the electromagnets 162 and I 165.may be traced over the conductors clearly disclosed in Fig. 8.

For the depression of the keylevers 18, such for example as the function keylever, it is desired to prevent the operation of the counting mechanism 10. The operation of the counting mechanism 10 upon the depression of these particular keylevers is prevented by having the bar 59 arranged to move to the left upon the depression of these keylevers. When so moved, a contact spring'65 is moved through the arm 61 to disengage the contact carried by spring 63, and thus open the circuit of'the stepping magnet 162 of the counting magnet 10. With the circuit open at the contacts carried by

springs

63 and 65, the stepping magnet 162 will not be energized upon the closure of contacts 152, and the pointer of the counter will accordingly not be advanced.

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 116 is-moved to its lowest position, or the position shown in Fig. 6. In moving the switch member 116 to this particular position, the member 95 is moved through the bolt 136 which is secured to switch member 116 to a position where it is out of alignment with the pointed end 93 of the T-shaped lever 92. Consequently, when the universal bail 96 is operated upon the depression of any of the keylevers, the member 95 will not be operated, the stop arm 89 will remain in its set position, and the cam drum will not be released for rotation. Under these conditions impulses will not be transmitted to the line circuit 140 from the transmitting cam drum 80, as was previously described, upon the depressionof the character keys.

When the switch member 116 is in its lowermost position, the contacts carried by

springs

112, 113, 114, and 115 will be closed, but as to the contacts on

springs

114 and 115, they will not beclosed immediately when the switch member 116 is moved to its lowermost position from its uppermost position. These contacts will be closed, as was previously described, when the member 127 is moved to the left as viewed in Fig. 5, due to the engagement of arm 126 with the horizontal projecting portion 125 of member 122. The delay in the closure of the contacts of

springs

114 and 115, as has already been described, serves to prevent the premature operation of the perforator. The circuit for the electromagnet 44 of the perforator, as well as the circuits of the

electromagnets

162 and 165 of the counting mechanism 10, will be closed in accordance with the closure of the circuits controlled by

contacts

52 and 62. In operating the perforator without operating the keyboard transmitter, the counting mechanism 10 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 of the counter, the carriage return key is depressed, which operates to close the contacts carried by

springs

63 and 64 and complete an energizing circuit for electromagnet 165 to restore the pointer to its normal or zero position.

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

What is claimed is: i

1. In a telegraph keyboard mechanism. elcctrical 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 upon their actuation, means common to said contacts and said perforator and operated by said code bars for effecting the operation ofsaid contacts and perforator simultaneously, means for permitting the separate operation of said contacts and said perforator, and means for preventing the opera tion of the perforator upon the operation of said means for changing from the operation of said contacts to the operation of the perforator.

2. In a telegraph keyboard mechanism, an electrical contact, means for operating said contact for the transmission of code signals, a perforator,

a plurality of keylevers, a set of code bars movable by said keylevers and common to said contact and said perforator for effecting their si multaneous operation, means for permitting the separate operation of said contact and said perforator, and means for preventing the premature operation of the perforator in response to the operation of the second recited means.

3. In a telegraph keyboard mechanism, an electrical contact, means for operating said contact for the transmissionof code signals, a perforator, a plurality of keylevers, a set of code barsmovable by said keylevers and common to said contact and said perforator for effecting their simultaneous operation, a switch member for permitting either the simultaneous or the separate operation of the perforator or contact, and means actuated following the operation of said switch member from a position for the operation of the contact to a position for the operation of the perforator for rendering said perforator effective upon the subsequent depression of a keylever.

4. 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 common to said contacts and said perforator for controlling their operation movablein accordance withthe-actuation of the keylevers and arranged to remain in their set position until changed by the depression of another keylever, a switch member for permitting either the simultaneous or the separate operation of the contacts and perforator, and means efiectiv'e when said switch member is moved to prevent the operation of the per- .forator in accordance with the previous setting of; the code bars.

5 In a telegraph keyboard mechanism, elec-- trical contacts, means for operating said contacts for the transmission of code signals, a perforator,-

a plurality of keylevers, a set of code barscommon to said contacts and said-perforator. for controlling their operation movablein accordance with the actuation of the keylevers and arranged to remain in their set position until changed by the depression of another keylever, a switch memberfor permitting either the simultaneous or the separate operation of the contactsand perforator, and means efiective upon the depression of a keylever following the operation of the switch member for rendering said perforator responsive.

6. In a telegraph keyboard mechanism, electrical transmitting contacts, means for operating said contacts for'the transmission of code signals, a perforator, a plurality of keylevers, a set of code bars common to said contacts and said perforator for controlling their operation movable in accordance with the actuation of the keylevers and arranged to remain in their set position until changed by the depression of another keylever, "a switch member for permitting either the'simultaneous or the separate operation of the contacts and perforator, a plurality of contacts operated by said switch member for determining the effectiveness of said transmitting contacts and said perforator, a member operatively associated with said contacts and effective when said switch member is in a predetermined position for maintaining certain of said contacts out of engagement with each other, and means operated upon the depression of a keylever for operating said member to allow the closure of the associated contacts and the operation of the perforator in responseto the depression of the keylevers.

cal transmitting contacts, means 'for operating said contacts for the transmission of code signals,

a perforator, a plurality of key-levers, a set of 5 code bars common to said contacts and said per-' forator for controlling their operation movable in accordance with the actuation of the keylevers 7. In a telegraph keyboard mechanism, electriand arranged to remain in their set position until changedby the depression of another keylever, two sets of electrical contacts, one for said transmitting contacts and the'other for said perfora-.

said perforator or their simultaneous operation,

means associated with one of said set of contacts for normally holding the contacts thereof out of engagement, means pivotally associated with said means and operated in response to the movement of said switch member, and an arm operated by any of the keylevers cooperating with said last mentioned means for moving the associated means to effect the closure of the set of contacts controlled thereby.

8. In a telegraph keyboard mechanism, electrical transmitting contacts, means for operating said contacts for the transmission'of code signals, a perforator, a plurality of keylevers, a set of code bars common to said contacts and said perforator for controlling their operation movable in accordance with the actuation of the keylevers'and arranged to remain in their set position until changed by the depression of another ,keylever, two sets of electrical contacts, one for said transmitting contacts and the other for saidmitting contacts and said perforator' or their simultaneous operation, a spring urged slide associated with one of said sets of contacts for-normally holding the contacts thereof out of engagement, an element fastened .to said slide and cooperating with said switch member, a spring for moving said element upon the movement of said switch member to two of its three positions, and means operative through said element upon a depression of a subsequent keylever for moving said slide against its spring and causing the closure of the contacts controlled thereby.

9. In a telegraph keyboard mechanism, electrical contact means for the transmission of code signals, a perforator, a plurality of keylevers, a set of code bars operated by said keylevers and arranged to operate said contact means and perforator simultaneously, means for permitting the separate operation of said contact means and said perforator, and means for delaying the operation of the perforator for a change from the operation of the contact means to the operation of the perforator until the depression of a keylever subsequent to the change.

10. In a telegraph mechanism, electrical conforator, a plurality of keylevers, a series of code elements set in position by said keylevers, means for permitting the separate operation of said contact and perforator in accordance with the operation of said code elements, and means tor preventing the premature operation of the perforator in response to the operation of the second recited means.

, ROSS A. LAKE,