Manual / Guide · 1964
Bulletin 141B - Description and Adjustments Models 14 and 20 Transmitter Distributor 1964
Bulletin 141B — Description and Adjustments, Models 14 and 20 Transmitter Distributor (+ two-channel TD, distortion test set)
Manual / Guide · 1964
Bulletin 141B — Description and Adjustments, Models 14 and 20 Transmitter Distributor (+ two-channel TD, distortion test set)
( ( ( BULLETIN 141B DESCRIPTION AND ADJUSTME NTS MODELS 14 AND 20 TRANSMIT TER DISTRIBUTOR MODEL 14 DISTRIBUTOR, TWO-cHANNEL START-STOP TRAN SMITTER DISTRIBUTOR, SIGNAL Dl STORTION TEST SET (TAPE OPERATED) ( ( TELETYPE® CORPORATION ( 5555 TOUHY AVENUE, SKOKIE, ILLINOIS t Copyright 1945 by Teletype Corporation Printed in U.S .A. 141B j� LIS T OF E F F E C TIVE PAGES "� APRIL, 1964 (Supersedes Issue of July, 1962) PAGE CHANGE NUMBE R IN EFFECT Cover Page CHANGE 2 Title Page CHANGE 2 A CHANGE 2 B to D ORIGINAL E to I CHANGE 1 1-1 CHANGE 1 1-2 CHANGE 2 1-3 to 1-8 CHANGE 1 2-1 to 2-6 CHANGE 1 2-7 CHANGE 2 2-8 CHANGE 1 2-9 to 2-10 CHANGE 2 2-11 to 2-12 CHANGE 1 2-13 CHANGE 2 2-14 to 2-18 CHANGE 1 2-19 CHANGE 2 2-20 to 2-21 CHANGE 1 2-22 CHANGE 2 2-23 to 2-29 CHANGE 1 3-0 to 3-0b CHANGE 1 3-1 ORIGINAL 3-1a CHANGE 1 3-2 to 3-8 ORIGINAL 3-9 CHANGE 1 3-10 ORIGINAL 3-11 CHANGE 1 3-12 to 3-17 ORIGINAL 3-18 to 3-19 CHANGE 1 3-20 to 3-22 ORIGINAL 3-23 CHANGE 1 •'1 ) ' , ). ; :; : ' '' The above list indicates the effective pages as of the date of issue. Upon receipt of change pages, insert them numerically and discard any superseded pages. \� .J A CHANGE 2 co """" 0 0::: 1::::> co 0::: 1- � 0 0::: w 1- � !:: V') 0::: 1- z <( ...J <( z 0 0::: 0 AI 0 () 0 AI 0 c -; o;1 AI -; Vl � o;1 a: 0 \.._ :::> CD . . 0 0:: .._ en - 0:: LLI .._ .._ ::E (/) 2 � 0::: t- l Q. 0 .._ (/) tcr en � I ..J LLI z z � :r: 0 0 3: .... 0 trl t-3 en t-3 en t-3 trl 0 z .... tj u:J t-3 0 ::0 t-3 r< 0 z � en .... to � >!>. � 141B CONTENTS ( Paragraph Page SECTION 1 - DESCRIPTION 1. General a. ( c. Transmitter Distributors Distributors Two-Channel Start-Stop d. Signal Distortion Test Set b. Transmitter Distributor 2. 3. Theoretical Circuit Theoretical Transmitting Circuits a. ( 4. 17. 1-1 1-1 Rubout Deleting Mechanism SECTION 2 - ADJUSTMENTS 1. General 2-1 1-1 1-2 2. Adjusting Procedure a. Distributor Proper 2-1 2-1 (1) "B" Transmitter Operating Lever 2-1 (2) Main Shaft 2-2 (3) (4) Motor Position Magnet Core 2-2 2-2 Armature Plate Stop Lever Pilot Screws 2-2 1-2 1-2 (5) Distributor 1-3 1-3 c. Signal Distortion Test Set 1-3 (6) (7) Lever) Pilot Screws 2-2 The Tape Sensing Mechanism 1-3 (8) Start Magnet Bracket 2-2 (9) Armature Lever Spring For Transmitter Distributors 1-3 For Distributors 1-4 Tape Sensing Mechanism 1-4 (2) (10) (11) (12) ( Tension 2-3 Stop Lever Spring Tension 2-3 Latch Lever Spring Tension 2-3 Latch Lever Stop Reset Cam 2-3 2-3 1-4 (13) (14) Clutch Shoe Lever 2-3 7. Distributor Mechanism 1-5 (15) Clutch Shoe Spring Tension 2-4 (16) Clutch Shoe Lever Spring 8. Tape Feed Mechanism (1) 2-4 Gear Guard 2-4 (18) Operating Lever Spring Tension (100 WPM Operation) (19) 1-5 Tape Stop-Magnet Bracket 1-6 (a) 1-6 (b) 2-4 2-5 (22) Stop-Arm Spring Tension 2-5 (23) (24) Stop Lever Pilot Screws Armature Backstop 2-5 2-5 2-5 (21) Transmitter Distributor 1-6 1-6 Universal Magnet D. C. Magnet 2-4 2-4 2-4 Stop-Arm Pilot Screws 1-6 Signal Distortion Test Set - 2-4 Bail Spring Tension (100 WPM Operation) (20) (c) Clutch disengagement Two-Channel Start-Stop Control Switch 10. Tension (17) 1-5 Units equipped with all metal clutch (b) Clutch engagement c. 1-5 Units equipped with friction clutch (2) b. 1-5 Transmitter Distributor or Signal Distortion Test Set l Stop Lever and (Latch Distributor Mechanism a. (, 2-2 6. 9. Starting and Stopping Transmission ( 1-8 b. (1) 5. Page 1-1 Transmitter Distributors and Signal Distortion Test Set Paragraph (25) Stop Magnet Contact (26) Tape Feed-Pawl Spring Detent-Lever Spring Tension Tight-Tape Stop Mechanism (Auto-Stop Mechanism) 1-6 (27) Tension 2-6 11. Tape Stop Switch 1-7 (28) Feed Wheel Shaft Bearings 2-6 (2 9) 12. End-Of-Tape Stop Mechanism 1-7 Tape Retaining-Lid Latch Wearing-Strip Shims (30) Tape Space 13. 14. Bell-On-Blank Signal Mechanism 1-7 Torn Feed Hole Tape Stop Mechanism 1-7 15. Synchronous and Governed Motors 1-8 16. Filter Cutout Switch - Signal Distortion Test Set CHANGE 1 1-8 2-6 2-6 2-6 2-6 (31) Tape Guide (32) Detent Bracket (33) (34) Tape Retaining-Lid Plate 2-7 2-7 Retaining-Lid Latch Spring Tension 2-7 (35) Feed-Lever Adjusting Screw 2-7 (36) Operating-Lever Adjusting Screw 2-7 F 141B CONTENTS (Cont'd.) Page Paragraph (37) (3 8) (39) (40) F eed-Lever Stop 2-7 2-8 Tape Transmitter Contacts 2-8 Lower Contact Screw 2-8 Contact Tongues Alignment (a) (b) 2-8 For Units Designed to (41) Upper Contact Screw 2-8 (42) Contact-Lever Spring 2-8 Tension Contact Lever Movement (44) Feed-Lever Spring (45) Tight-Tape-Stop or Auto- Tension Stop Mechanism (46) ("A" and "B" Transmitters) (64) Line Shorting and Trans- (65) Transmission Control Distributor Brushes 1. Carbon Brush 2: Braided Brush Low Brush Arm 3. 2-8 2-9 (67) (68) 2-9 2-10 2-10 2-11 Braided Brush - (69) BREAK-LOCK MECHANISM ADJUSTMENTS (72) Mounting Plate 2-11 Magnet Bracket 2-11 (49) Magnet Core 2-12 Shunt Contact 2-12 Shunt Contact Bracket 2-12 Push Rod Lock 2-12 (53) Break Contact 2-12 (54) Make Contact Contact Pawl Spring 2-12 Tension 2-12 (50) (51) (52) (55) (56) (71) (73) (74) (75) (76) Armature Lever Spring Tension 2-12 (5 8) Armature Lever Spring 2-13 (77) Distortion Test Set (61) (62) (b) Distributors (c) Two-Channel Units Tape Lockout Solenoid 2-13 G 2-13 2-13 Tension 2-16 2-14 Contacts 2-14 Transmitter, Operating Lever Spring Tension Lock Pawl ("A" and "B" Line Shorting Contact 2-14 2-14 "' Contact Springs and Armature Hinge Positions 2-16 Adjusting Stud Clearance 2-16 Adjusting Nut Tightness Armature Travel 2-16 2-17 2-17 Contact Spring Tension Stud Gap 2-17 Contact Sequence 2-17 Contact Make 2-17 ) '' Main Shaft Clutch Torque (c) 2-18 Transmitter Distributor 2-18 Distributor 2-18 Signal Distortion Test Set 2-18 ADJUSTMENT (7 8 ) (79) (80) 2-14 Control Relay Timing Transmitters) (63) 2-16 (b) butors and Signal (59. 1) (60) Plate Send-Stop Lever Spring RUBOUT DELETING MECHANISM Operating Cam (a) Transmitter Distri- ) Relay Switch Lever Pivot (a) END OF BREAK-LOCK MECHANISM ADJUSTMENTS (59) 2-16 Transmission Control RELAY ADJUSTMENTS 2-12 (57) Tension ("A" and "B" Transmitters) 2-1 5 END OF TRANSMISSION CONTROL Shunt Contact Lever Spring Tension Send-Stop Lever Spring ADJUSTMENTS (70) (47) (48) Relay Switch Lever Pivot TRANSMISSION CONTROL RELAY 2-11 High Brush Arm 2-15 Plate (66) . '� 2-14 fer Contact Adjustments ("A" and "B" Transmitters) use Regular Tape 2-8 ·� Page For Units Designed to use Chadless Tape Exclusively (43) Paragraph (81) (82) (83) ( 84) ( 85) 2-19 Rubout Bail Position Control Assembly Contact Spring Clearance and Tension Control Assembly Cam Follower Position Control Assembly Position Rubout Lever Mounting Bracket Rubout Lever Adjusting Bracket '�+) 2-19 2-19 2-19 J ';\ 2-19 2-19 Rubout Contact 2-19 Rubout Contact Assembly 2-19 CHANGE 1 J 141B CONTENTS (Cont'd.) ( ( ( 86) (87 ) (88) Paragraph Control Relay Rubout Bail Spring 2-19 (110) Tension 2-20 (111) 2-20 2-20 (112) (113) (114) (115) Intermediate Lever Spring Tension (89) (90 ) (91) ( Page Paragraph Control Switch Control Switch Contact 2-20 Spring Signal Distortion Contact Operating-Lever Spring Tension Break-Relay Armature Yoke Residual Screw Break-Relay Contact Armature Arm Armature Arm Backstop 2-24 2-24 2-24 2-24 2-24 2-24 END OF BELL-ON-BLANK ADJUSTMENTS 2-20 Calibration Page (116) Stop-Arm Contact Spring Tension (117) Stop-Arm Contact Gap 2-25 2-25 END-OF-TAPE STOP MECHANISM ADJUSTMENTS TORN FEED HOLE TAPE STOP ASSEMBLY ADJUSTMENTS (92) (93) End-Of-Tape StopContact-Pin Guide 2-21 (118) Contact-Spring Feed Wheel Shaft Bearings End-Of-Tape Stop- 2-22 (119) Tension SINGLE STEP TAPE FEED SUPPRESSION MECHANISM ADJUSTMENTS ( (94) (95) (96) (97) (98) Tape Feed Lever Latch Trip-Off Latch Eccentric Restoring Lever Eccentric (99) Non-Repeat Lever Spring (100) (101) Restoring Lever Plate Trip-Off Lever Spring Tension (103) ( 2-22 2-22 Spring Tension 2-23 (129) (130) (131) Trip-Off Latch Spring 2-23 Restoring Bail Spring 2-23 b. SUPPRESSION MECHANISM ADJUSTMENTS c. 2-23 BELL-ON-BLANK SIGNAL MECHANISM ADJUSTMENTS { (105) Contact Operating-Lever (106) Contact Operating-Lever (107) ( (108) (109) CHANGE 1 Latch 2-23 Bracket Contact Operating-Lever 2-23 Latch Overtravel 2-23 2-23 2-24 Contact Bell-On-Blank Tape Space Tape Finger Tape Retaining Lid Plate Tape Guide Retaining Lid Latch Spring Detent Bracket End-of-Tape Stop ConOperating Instructions 2-25 2-25 2-25 2-25 2-25 2-25 2-25 2-25 2-25 MECHANISM ADJUSTMENTS Tension Tape Guide Wire (121) (122) (123) (124) (125) (126) (127) 2-25 EXTERNAL CIRCUIT CONTROL CONTACT 2-23 END OF SINGLE STEP TAPE FEED (104) Tape Retaining Lid Latch Wearing Strip Shims (128) Restoring Lever Spring Tension (120) tact Spring Tension Tape Feed Lever Latch Tension (102) 2-22 2-22 2-22 2-22 2-25 Detent Lever Spring Contact Spring Tension Contact Clearance 2-26 2-26 Operating Lever Spring Tension 2-26 Synchronous Motors Starting Switch 2-26 Governed Motors 2-26 (1) (2) (3) Motor Armature Thrust Spring Compression Governor Shell Governor (a) Alignment and Squareness of Governor Contacts (b) Speed-Adjusting-Wheel (c) Speed-Adjusting-Lever (d) (e) Governor Shims Speed Setting Friction Washer Stop Plate 2-26 2-27 2-27 2-27 2-27 2-27 2-27 2-27 H 141B CONTENTS (Cont'd.) Page Paragraph (4) End-Ring Governors (a) Inner and Outer Disk 2-28 Contact Spring 2-28 (b) (5) Page Spring-Plate 2-28 �, 2-28 (d) Governor Guard Peripheral-Ring Governors 2-28 (a) Governor-Brush 2-28 (b) Bracket Governor-Brush Spring Tension 2-28 Governor-Brush Bracket (c) Paragraph , ·'·"" ·.·, "' Governor-Brush Spring Pressure 2-28 SECTION 3- LUBRICATION ) " J I CHANGE 1 141B SECTION 1 ( ( ( DESCRIPTION 1. GENERAL a. ure 1) ( ( ( (Fig (1) The transmitter distributor is a motor driven device which translates code com binations, perforated in a paper tape, into elec trical impulses and transmits these impulses to one or more receiving stations. The tape may be perforated by any one of several models of Teletype perforating or reperforating machines. (2) There are two kinds of transmitter distributors; one for transmitting five unit code, and the other for transmitting six unit code. These two kinds are identical except that the six unit code machine accommodates a wider tape and provides for the transmission of an additional impulse. The following description pertains specifically to the five unit transmitter distrib utor. b. ( TRANSMITTER DISTRIBUTOR DISTRIBUTORS (1) The distributors described herein are motor driven devices, which translate code combinations from fully perforated or chadless tape into electrical impulses. These impulses (set up locally) are combined with impulses from an external source and these combined signals are used in printing telegraph transmitting or receiving circuits. (2) As the tape automatically feeds through the sensing mechanism, the tape pins sense the perforations in the tape and thereby determine the positions of the contact tongues with relation to the upper or lower contact screws. The signals received on the distributor segments are routed through the contact tongues to either the upper or lower contacts depending upon the selected combination in the tape. forated tapes (either chadless or fully perforated) at 368 o.p.m. per channel. When conditions do not warrant two-channel transmission, the unit may be operated as a single channel transmitter distributor. (2) Since the frequency of the trans mitted impulses at 368 o.p.m. is 23 cycles per second for single channel operation, and 46 cycles for two-channel, consideration should be given to the characteristics of the circuit on which the unit is to be used. (3) At receiving stations, standard start-stop printers or reperforators connected in series may be used. It is recommended that these units be equipped with holding magnet selectors to provide maximum orientation range. Signals from "A" channel will be recorded on its respective receiving unit when the index arm of the range finder is oriented to the most fav orable position on the upper portion of the range scale. Signals from "B" channel will be re corded on its respective receiving unit when the index arm is oriented to the most favorable po sition on the lower portion of its range scale. ( 4) Where Teletype units with selectors of the pulling magnet type are used at receiving stations, or where it is desireable to use spare receiving units interchangeably on all channels, without reorientation, it is suggested that a pair of Teletype regenerative repeater units be con nected in series with the line and that each be oriented to its respective channel. The regen erative repeater units, being equipped with the holding magnet feature, provide maximum or ientation range for two-channel operation. The regenerated impulses relayed to the receiving units will be of the required length to provide normal orientation range for the selectors. This arrangement facilitates the interchange of re ceiving units between associated start-stop channels and circuits. (3) The distributor combines the im pulses from the local and external source and completes the connection to the signal line. Connections are made in sequence at a uniform rate of speed by the brushes which traverse the segments and collector rings. (a) Transmits BLANK combina tion when one channel only is idling. c. TWO-CHANNEL START-STOP TRANS MITTER DISTRIBUTOR (b) Transmits LETTERS combin ation when one channel only is idling. (1) The Teletype two-channel start stop transmitter distributors herein described are motor driven units that utilize the circuit in such a manner as to provide two-channel trans mission of messages from two separate per- (6) These two - channel transmitter distributors (Figure 2) each include two tape sensing and transmitting mechanisms and a special distributor commutator having five pairs of segments for the transmission of intelligence CHANGE 1 (5) Two transmitter distributors are available which differ as follows: 1-1 141B impulses, a start segment, a stop segment, and an "X" segment located between the start and stop segments. Since no distributor clutch is provided, the distributor brushes rotate contin uously with the motor. The present arrange ment requires fully attended service in which the operator inserts the message tape and starts and stops the transmitters manually. No tight tape or end-of-tape stop mechanisms are being provided. A switch lever, located on the lower front portion of the unit, switches the distributor circuits in preparation for either single channel or two-channel operations. A send-stop lever associated with each transmitter controls trans mission on individual channels. During single channel operation, the "A" channel transmitter only can be used. A toggle switch controls the starting and stopping of the motor. d. SIGNAL DISTORTION TEST SET - The signal distortion test set is a motor driven mech anism designed to transmit signals which are distorted by either bias or end distortion. It is used for the purpose of determining the efficiency of start-stop selectors on Teletype apparatus. In all other respects it is similar to the Model 14 Transmitter Distributor. NOTE In all the figures of this bulletin. end views of fixed pivot points are designated by solid black circles. THEORETICAL CIRCUIT - See Note (1} on 2. Page 2-1 a. Interposed in the circuits between the transmitter tongues and the distributor code seg ments are the contacts of the transmission con trol relay (Figure 3}. This relay is under the control of the switch lever located on the lower front portion of the unit. With the relay ener gized (switch lever thrown to left}, its contacts connect the five tongues of the "B" channel trans mitter to the "B" segments of the distributor. The tongues of the "A" channel transmitter are directly connected to the "A: segments. Parallel paths from the "A" tongues lead to open contacts on the relay. Under these conditions, the ro tating distributor brush will alternately connect "B" and "A" channel transmitter tongues to the signal line thus providing two-channel transmis sion. The code impulses transmitted will depend on the positions of the transmitter tongues with relation to their upper and lower contact screws. The lower contact screws of each transmitter are permanently connected to marking line bat tery. No battery is applied to the upper contact screws when the transmitters are sending neutral telegraph impulses. Spacing battery is applied to these contact screws when sending polar im pulses. Means is provided for switching the up1-2 per contacts of each transmitter on certain units to marking battery when idling. The stop seg ment is permanently connected to marking bat tery; the start segment to the spacing battery lead. The center solid ring of the distributor is connected to the signal line. During two-channel transmission, the relay contacts connect the "X" segment to the stop segment. The start and stop impulses then transmitted are effective on both channels. The signal line frequency will be dou bled due to intelligence impulses being one-half their normal length, and selectors of receiving units will register corresponding reductions in orientation range. b. With the transmission control relay de energized (switch lever thrown to right), the "B" transmitter tongues are disconnected from the "B" segments and the "A" and "B" segments of each pair are electrically joined through the con tacts of the relay. The X segment is switched from the stop to the start segment. This length ening of the start segment causes an upward shift of the orientation range with reference to the range scale on receiving units. The "B" channel receiving unit will be out of range and the normal single channel impulses then trans mitted will be presented to the "A" channel re ceiving unit, so timed, that a change in the index arm position should be unnecessary. " , ,,, J " c. When the send-stop lever of a trans mitter is placed in the stop position, the BLANK or LETTERS (whichever unit is used) combina tion is repeatedly transmitted on the respective channel, provided that one channel only is idle. With both send-stop levers in the stop position, line-shorting contacts associated with these levers unite to close a line-shorting circuit which shunts the distributor segments and connects marking battery directly to the signal line to pre vent the transmission of impulses during idle rotations of the brush. A set of control relay timing contacts located in the circuit leading to the transmission control relay winding, and act uated by mechanism associated with the main shaft, prevents channel switching except during the time in which the brush is traversing the stop segment. d. Units that transmit the LETTERS com bination are equipped with two sets of transfer contacts which are actuated by the send-stop levers. With a send-stop lever in the stop po sition, these contacts apply marking battery to the upper contacts of the associated transmitter (or switch the contacts from spacing to marking battery in the case of polar transmission) causing the LETTERS combination to be continuously transmitted on the idle channel. 3. THEORETICAL TRANSMITTING CIRCUITS - See Note (G) on Page 2-1 CHANGE 2 �) .� .� �vJ 141B a. ( TRANSMITTER AND tongue is positioned to move between two con tact screws, a spacing contact screw above, and of the unit transmitter (Figure 4). a marking contact screw below. A contact-lever spring is attached to the mounting end of each The transmitter prepares electrical paths from contact and tends to hold it against the lower con through which the perforated tape feeds is known as the the signal line battery to the commutator seg ments of the distributor. ( DISTRIBUTORS SIGNAL DISTORTION TEST SET - The portion (See Figure 5). These tact paths are controlled by tape pins which sense the perforations in the tape and thereby determine ' 6) with the positions of the contact tongues (Fig. relation to their upper and lower contact screws. screw. Extension B DISTRIBUTOR - The distributor (Fig c. A contact-lever bail, pivotally mounted arm which extends downward and a op2rating lever (Figure 7) has a central pivot screw and moves in a horizontal plane. line. Connections are made in sequence at a on the rear end of the lever rides a transmitter constant rate of speed by brushes which traverse operating cam mounted on the lower end of the distributor (main) shaft. A roller The motion imparted to the transmitter operating lever by the opera c. FOR SIGNAL DISTORTION TEST SET ting cam causes the contact lever bail to rotate The commutator distributor completes the con the contact levers on their shafts sufficiently to nection between the commutator segments and move the contact tongues up and down between the signal line in the proper sequence and at a the marking and spacing contact screws. given and constant rate of speed. This is ac the tongues strike the upper screws, any addi complished by brushes which are drawn across tional clockwise rotation of the contact levers is the segments by the distributor brush arm at absorbed by the contact lever springs. tached to the distributor shaft. After The brush arm (1) supports two sets of brushes: one pair of brushes makes contact with the inner solid collector ring ( engages This transmitter ure 4) completes the connections to the signal the segments and the collector ring. ( vertically just below contact lever lower extensions, has an transmitter operating lever. b. extends d::>wnward and engages the contact-lever bail. For Transmitter Distributors - When the distributor brush comes to rest on the and the segments of the stationary ring; the sec stop segment (Figure 4), the transmitting opera ond pair of brushes makes contact with the re ting-lever roller is on the peak of its cam. maining solid collector ring and the segments position of the operating-lever roller, through mounted on the movable ring. The latter brushes This the medium of the operating lever and the contact and rings are used alone for normal signal trans lever bail, mission but both sets of brushes and rings are position that the tape pins are below the upper holds the contact levers in such a used for the transmission of distorted signals by surface of the tape guide, and the contact tongues making various combinations of electrical con rest against the spacing (upper) contact screws. nections between the segments and rings. (2) 4. THE TAPE-SENSING MECHANISM - See For Distributors - When the main shaft is stopped (lug on stop cam against the end of stop lever) (Figure 8) the contact tongues are Notes (F) and (G) on Page 2-1. held against the spacing or upper contact screws a. The tape-sensing mechanism consists and the tape pins mounted on the right-hand ex essentially of a group of five similar contact tensions of the contact levers are held below the levers (Figure 6) with associated contact tongues, holes in the tape. a contact block with five pairs of contact screws (five marking and five spacing), and a group of ( d. As the op2rating lever roller rides to parts c.onsisting of a contact lever bail, opera the low part of its cam, the tape pins rise. ting lever and roller, and operating cam (Fig tape perforated with code combinations is in the If tape guide at this time, the contact lever pins ure 7). will project through the tape wherever the tape The five contact levers (Figure 6) are is perforated and permit the associated contact positioned vertically in the transmitter and all tongues to rest on the marking contacts (lower pivot on the same shaft S. contact screws), while the pins will be blocked b. ( Each contact lever has three irregularly shaped extensions - to the at the unperforated portions and the associated left A, downward B, and to the right C. contact tongues will be held against the spacing Exten sion C projects upward at the end and has a small extension. An opening is provided in a tape (1) For Transmitter Distributors guide, located above the right-hand extension C of the contact lever, to permit the tap2 pins to (, contacts (upper contact screws). tape pin embedded vertically into the end of the enter the code holes in the tape. The left-hand (a) The tape will be held station ary and the contact tongues will maintain their extension A has a contact tongue assembly at positions as determined by the code perforations tached to it by a pivotal mounting. while the distributor brush is traversing seg- CHANGE 1 Each contact 1-3 141B ments one to five inclusive. The inner distri butor brush will transmit marking impulses to the line from segments associated with tongues tact tongues up and d:>wn between the marking and spacing contact screws. After the tongues strike the upper screws, any additional clockwise ro that rest on the lower contacts, and spacing im tation of the contact levers is absorbed by the pulses (for polar signal transmission) from seg contact lever springs. ., ments associated with tongues that are on the upper contacts. When "make-break" c. signal When the distributor brush is on the stop transmission is used (battery applied only to the segment, the transmitter operating lever roller lower contacts), a no-current interval occurs is on the peak of its cam, thereby holding the when the contact tongues are against the spacing tongues against the SPACING c.:mtaet screws and , also holding the tape pins, located in the right contacts. hand extensions of the contact levers, below the (b) When a message on chadless tape is inserted in the tape guide, with the print ed symbol of the character to be transmitted po sitioned opposite the tape locating mark im holes in the tape (see Figure 6). As the trans mitter operating lever roller (Figure 9) rides to the low part of its cam, the tape pins rise. If the tape perforated with code combinations is in pressed in the tape guide, the code perforation the tape guide at this time, for that character will be over the tape sensing pins will project through the tape wherever the pins in position for transmission. Under this tape is perforated, and will permit the associ condition, if the tape retainer of the transmitter ated contact tongues to rest on the MARKING distributor is fastened over the tape, the tape contact locating mark will be covered, but the printed blocked by the unperforated portions of the tape character will be visible immediately to the right will cause the associated contact tongues to be of the tape retainer. screws. the c.:mtact lever Contact lever pins that held against the SPACING contact screws. ·� are The tape will be held stationary and the c.ontact ton For Distributors - The tape will be gues will maintain their positions as determined held stationary and the contact tongues will main (2) by the code perforations while the distributor tain their positions as determined by the code brush is traversing segments B-1 and A- 5 in combinations perforated in the tape while the dis clusive. tributor brushes are traversing the segments and MARKING impulses to the line from segments collector ring. The inner brush picks up signals The distributor brush will transmit associated with tongues that rest on the lower from the line and the outer brush distributes them contact screws, to their proper segments which, polar transmission) from segments associated in turn, are con11ected to their corresponding contact tongue. 5. -- SPACING impulses for '"··..). '"• with tongues that are against the upper contacts. If "make-break" transmission is used (battery TAPE SENSING MECHANISM- See Note (1) on Page 2..:T and ----·------- applied to the MARKING contact screws only), a no-current interval occurs when the brush trav erses segments associated with contact tongues a. The contact levers (Figure 6) are po sitioned vertically in the two transmitters. Each contact lever pivots on a shaft and has a tape pin located at the extremity of its right-hand exten sion which projects upward through an opening in the tape guide and senses the code holes in the tape. A contact tongue, which moves ver tically between two contact screws (upper- spac ing, and lower - marking) is attached to the left hand extension of each contact lever by a pivotal that are against SPACING contact screws. 6. DISTRIBUTOR MECHANISM - See Note (G) on Page 2-1 a. The distributor mechanism consists of the distributor disk and the distributor brush assembly. b. The distributor (Figure 4) is made up of two concentric conducting rings mounted on an insulated disk. The outer ring is divided into mounting end of each contact tongue tends to hold seven segments. The inner ring is a continuous the tongue against the lower contact screw. conductor. mounting. A contact lever spring attached to the .. J Segment Nos. 1 to 5, inclusive, of the outer ring, correspond to the five intelli b. Each of two transmitter contact lever gence intervals of the five unit code and are con bails, pivotally mounted just below the contact nected to the five contact tongues. lever lower extension, preceeding No. downward (Figure 6). has an arm extending One arm engages the "A" Immediately 1 Segment is the start segment. The segment following No. 5 Segment is the stop transmitter operating lever and the other engages segment. the "B" transmitter operating lever (Figure 9). tact screws are permanently connected to mark The stop segment and the lower con A cam on the lower end of the main shaft imparts ing line battery. motion operating contact screws are connected to spacing line bat to "A" and "B" transmitter The start segment and the upper This motion tery only when it is desired to transmit polar causes the contact lever bail to rotate the contact signals; otherwise, the upper contact screws and levers on their shaft sufficiently to move the con- the start segment have no battery connections. levers which are linked together. 1-4 CHANGE 1 ·t� 141B c. ( The distributor brush When the brush reaches the stop seg ment on the outer ring, negative battery is ap plied to the stop segment from the small segment the brush holder arm, which is m::JUnted on the on the inner ring. upper end of the main shaft. The brushes are spaced in the brush holder the same distance apart as the concentric rings on the distributor ( g. assembly con sists of a pair of brushes clamped in a metal brush holder. The brush holder is attached to disk and revolve with the main shaft. assembly makes one complete The brush revolution to h. When the brush reaches the rest seg ment on the outer ring, the stop lever is latched on the operating armature extension by means of the reset extension of the stop lever which rides transmit the code combination for each char on the lug on the stop cam, acter or function. When the distributor brush lever S::J it will be latched during the time the passes over the start segment, a spacing impulse operating magnet armature is in its unoperated is always transmitted, whereas a marking im position. resetting the stop pulse always results when the brush traverses the stop segment. cause the These two invariable impulses receiving mechanism to 8. unison with the distributor brush arm. ( TAPE FEED MECHANISM operate in Positioned to the rear of the contact levers and pivoted on the contact lever shaft is a feed 7. DISTRIBUTOR MECHANISM (FIGURE 8) -� See Note (F) on Page 2-1 lever (Figure 11) which is similar in shape to a c.:mtact lever. The feed lever has a spring at tached to its left-hand extension and a feed pawl a. The distributor brush arm is mounted on the upper end of the main shaft and is driven by a gear through the medium of a friction clutch. mounted on its right-hand extension C. A feed pawl spring holds the feed pawl in contact with a feed wheel ratchet. Pins on the circumference of the feed wheel (Figure 6) project through an b. The distributor commutator is made up holes in the tape. an insulated disk. the tape passes, holds the tape in contact with The outer ring is divided into five large and ten small segments. The inner ring has two segments; one is a small segment ( opening in the tape guide and mesh with the feed of two concentric conducting rings mounted on A retaining lid, under which the feed wheel pins. When the action of the con tact lever bail on the contact lever moves the and the other a large segment which forms the tape pins downward, the feed lever responds in most of the ring. similar manner, causing the feed paw 1 to engage The brushes on the brush arm wipe over the rings, thereby connecting the inner a tooth :m the feed wheel ratchet and rotate the segments to the outer segments. feed wheel. With each downward motion of the feed pawl, the tape will ba advanced from right c. In the normal unoperated position, the to left, the distance required to bring the suc main shaft is held stationary, because the lug of ceeding code combination over the the stop cam is against the end of the stop lever. The setting of the feed pawl is such that it does not tape pins. Under this condition, the brush arm is positioned start to rotate the feed wheel until the tape pins so that the one brush rests on the large inner have moved clear ofthe tape. ring segment and the other brush is on one of the tent is provided to insure alignment of the code A feed wheel de small segments to the left of the stop segment perforations with the tape pins. on the outer segment ring. the operating cam with relation to the distributor The pQsition of brush is such that the contact tongues are not d. ( When the start impulse is received, moved from the lower contacts until after the positive battery is applied to the operating mag brush has reached the stop segment. net c.Jils through the large inner ring segment brush is passing over the stop segment, the tape and the small segment on the outer ring. is advanced. e. This will energize the operating magnet 9. While the STARTING AND STOPPING TRANSMISSION coils so that the stop lever is unlatched from the armature extension and is held out of the way of the lug on the stop cam, permitting the main a. TRANSMITTER DISTRIBUTOR OR SIG NAL DISTORTION TEST SET shaft to rotate. (1) ( ( f. When the brush reaches the start seg Units Equipped with Friction Clutch - The main shaft is driven by a motor through ment, it closes a path to transmit a start or po the medium of gears and a friction clutch. sitive battery signal. the motor is running, transmission is stopped When the brush reaches When the No. 1 Segment, the line signal will be con by blocking the rotation of the main shaft and nected to the No. 1 Contact Tongue. started by unblocking it. The same procedure takes place when the brush reaches This is done through the medium of a stop arm which is under the the Nos. 2, 3, 4, and 5 Segments on the outer control of a tape stop magnet and a spring. ring. ure 4). CHANGE 1 The magnet, when energized, (Fig holds the 1-5 141B stop arm clear of the lug. The spring holds the stop arm in the path of the lug when the magnet is de-energized. The circuit to the magnet is controlled by two pairs of contacts and a switch which are in series with the magnet and the power supply. See paragraphs 10, 11, and 12. (2) Units Equipped with All Metal Clutch (a) With the start magnet de-ener gized, the stop lever engages the shoe release lever which permits the clutch shoes to withdraw from the clutch drum. The clutch drum, gear and gear bearing are then free to rotate with the motor pinion while the main shaft remains sta tionary. A latch lever drops in a notch in the stop disk and prevents oscillation of the disk. Energization of the start magnet causes the stop lever to release the clutch shoe release lever. The release lever causes the clutch shoes to engage the drum so that the entire clutch assem bly rotates. Since the disk is attached to a disk bearing on the main shaft, the shaft rotates with the clutch. (b) Clutch engagement (Figure 10) is accomplished by releasing the lower end of lever B. The upper end of lever B pivots about its ear C (which bears against the upper end of the secondary shoe) and moves its ear D, and the upper end of the primary shoe, toward the left until the shoe makes contact with the drum at point E. As the drum turns counterclockwise, it drives the primary shoe downward, so that it again makes contact with the drum, this time at point F. There, the combined forces acting on the primary shoe cause it to push against the secondary shoe at point G. The lower end of the secondary shoe then bears against the drum at point H. The revolving drum acts to drive this shoe upward so that it again makes contact with the drum at point I. Since the forces involved are multipled at each succeeding step, the final force developed at point I is very great. This force is applied to the lug Jon the clutch cam disk to cause it to turn in step with the drum. The cam disk on the clutch is connected to the cam shaft im parting rotary motion to the cam assembly. (c) Clutch disengagement (Figure 10) is accomplished by bringing together lug A on the clutch cam disk, and the lower end of the clutch shoe lever B. The upper end of lever B pivots about its ear C and allows its other ear D to move toward the right. The upper spring then pulls the two shoes together and away from the drum. (3) The circuit to the magnet may be opened or closed by means of the tight-tape stop contacts, tape stop contacts, tape stop switch, or the end-of-tape stop mechanism contacts 1-6 which are described in paragraphs 10, 11 and 12 that follow. b. TWO-CHANNEL START-STOP TRANS MITTER DISTRIBUTOR (1) The main shaft is geared directly to the motor and rotates continuously when the motor switch (see Figure 2) is in the ON position. (2) Each send-stop lever (Figure 2) in addition to actuating its associated contacts, con trols a locking pawl which blocks the action of the contact lever bail (Figure 11), when the send stop lever is in its stop position. With the con tact lever bail blocked in this manner, the tape pins are held depressed and the contact tongues rest against the spacing contacts. ·� ., ) ' (3) The control relay switch which is in series with the windings of the transmission control relay is operated by means of the switch lever which projects from the front of the unit. c. SIGNAL DISTORTION TEST SET CONTROL SWITCH - The changes in connections required for the transmission of signals with various types of distortion are handled by a single switch mounted on the vertical panel above the hinged tape lid. Reading clockwise, the po sitions of the control switch and a brief explana tion of the character of the signals obtainable at each setting of the switch are as