Manual / Guide · 1964
Description and Principles of Operation Model 28 Typing Reperforator Sets Teletype Bulletin 246B 1964
KTR/ROTR sets, LPR unit, tape and printed-character specs
Manual / Guide · 1964
KTR/ROTR sets, LPR unit, tape and printed-character specs
BULLETIN 246B DESCRJP TION AND PRJNCIPLES OF OPERATION MODEL 28 TYPING REPERFORATOR SETS TELETYPE® CORPORATION 5555 TOUHY AVENUE, SKOKIE, IL.L.INOIS SEE INDIVIDUAL SB:CTION FOR COPYRIGIHT NOTICES. PRINTED IN U. S. A. 246B INTRODUCTION Bulletin 246B provides description and principles of opera tion for the Send-Receive and Receive-Only Typing Reperforator Sets and associated component units. The Bulletin is made up of a group of appropriate independent sections. The sections are complete within themselves; they are sepa rately identified by title and section number and the pages of each section are numbered consecutively, independent of other sections. The identifying number of a section, a 9-digit number, ap pears at the top of each page of the section, in the left corner of left-hand pages and the right corner of right-hand pages. To locate specific information, refer to the table of contents. Find the name of the involved component in column one and the title of the section in column two. The correct 9-digit section number will then be found in column three. The sections are arranged in the order shown in the table of contents. Turn to page one of the section indicated where the contents of that section will be found (except where a section is small and does not require a listing of contents) . A 246B FEBRUARY, 1964 CHANGE 1 TABLE OF CONTENTS EQUIPMENT TITLE SECTION ISSUE Typing Reperforator Sets (KTR and ROTR) Description 573-102-100TC 1 Typing Reperforator Description and 573-118-100TC 1 573-121-100TC 1 Operation 573-133-100TC 1 Description 573-135-100TC 1 Keyboard Send-Receive and Receive-Only Principles of Operation Typing Reperforator Keyboards and Bases Description and Principles of Operation Electrical Service Unit Description and Principles of Typing Reperforator Enclosures B TELETYPE CORPORATION SECTION 573-102-100TC Skokie, Illinois, U.S. A. Issue 1, February, 1964 28 KEYBOARD SEND-RECEIVE AND RECEIVE-ONLY TYPING REPERFORA TOR SETS (KTR AND ROTR) DESCRIPTION PAGE CONTENTS serial start - stop (teletypewriter) code. The originating KTR set records the transmission on communications-type tape in the form of code 1. GENERAL .. . 1 2. VARIATIONS . 1 hole perforations and printed characters. The distant stations record the transmission on tape, page-width copy paper, or continuous business 3. COMPONENTS . ........ .. ..... 1 forms, determined by the facilities of the sta TYPING REPERFORA TOR UNIT ... 3 100 words per minute. tion. The sets operate at various speeds up to 1.02 SEND-RECEIVE KEYBOARD The 28 Receive-Only Typing Reperforator AND RECEIVE-ONLY BASE .. . . .. 3 Sets (ROTR) are similar to KTR Sets, but MOTOR UNITS 4 have no keyboard sending facilities. They are used in applications that require only the recep tion of messages on tape. ELECTRICAL SERVICE UNIT ..... 4 ENCLOSURES .. . . . . . .. . . . . . .. 6 4. VARIABLE FEATURES . ........ . 8 5. TECHlUCAL DATA .. .......... . 10 WEIGHTS AND DIMENSIONS ...... 10 KTR and ROTR Sets rest on any flat sur face or a table, which contains space for ad SIGNALING CODE ........... . . 10 ditional equipment (Figs. LINE CURRENT............ ... 10 (b) SPEED ............. . . . ..... 10 with TAPE ... .... ........ . . ... .. 10 (c) PRINTED CHARACTERS .. ....... 10 POWER REQUIREMENTS ...... .. 10 2. VARIATIONS 2.0 1 The Sets are available in several config urations to meet varying installation and operational requirements: (a) 1, 3, 4, and 5). Miniaturized Set - Similar to the other model ROTR Sets, but equipped table a close-fitting ·cover (Figs. 5 and 6). Multiple ROTR Sets- Provide the facilities of three ROTR sets in a single They are used, for example, in the Receiving and Monitor Groups of the mounting. Universal Torn Tape System (Figs. 7 and 8). 3. 1. Table Model Sets - These cover- enclosed COMPONENTS GENERAL 3.01 The component complement of the Sets 1.01 The 28 Keyboard Send-Receive Typing Reperforator Set (KTR) is an electro mechanical apparatus that provides terminal facilities for exchanging messages over appro may vary from one installation to another, depending upon the operational requirements. In general, a KTR Set consists of a typing re priate transmission facilities including telegraph lines, telephone networks, and radio channels. an electrical service unit, and an enclosure. The receive-only base replaces the keyboard in Receive Only Sets; and in the Multiple Sets, it accommodates three typing reperforator units. An operator sends the messages by typing them on a keyboard which translates the data to a perforator unit, a keyboard base, a motor unit, © 1964 by Teletype Corporation All rights reserved. Printed in U.S. A. Pagel SECTION 573-102-100 T YPING COPYHOLDER REPERFORATOR UNIT ' • ..-·· ..,..... � · · COVER KEYBOARD Figure 1 - 28 Keyboard Send-Receive Typing Reperforator Set A complete description of these components will sets may be interchanged to obtain various op be found in the appropriate section for a par erating speeds up to 100 words per minute. The transfer of rotary motion from the motor unit to ticular component. the typing reperforator unit in Receive-Only Sets is achieved through interchangeable gear 3.02 In KTR Sets, the motor unit and typing reperforator unit are mounted on the base portion of the keyboard (Fig. 2). The motor unit sets or, in certain Sets, by an optional, variable speed drive mechanism (Fig. 6). In the Multiple ROTR Sets, the typing reperforator units may supplies rotary motion through a gear set to the operate at a common, or at independently varied typing reperforator unit and the keyboard. Gear speeds. Page 2 I SS 1, SECTION 573-102-100 MOTOR UNIT DRIVING GEARS TYPING REPERFORATOR UNIT Figure 2 - 28 Keyboard Send-Receive Typing Reperforator Set (Cover Removed) TYPING REPERFORATOR UNIT (Fig. 2) SEND-RECEIVE KEYBOARD AND RECEIVE ONLY BASE (Figs. 2 , 4, 6 and 7) 3 .03 The typing reperforator unit contains the mechanisms necessary for translating 3.04 Both the send-receive keyboard and the receive-only base provide mounting fa electrical input signals into mechanical motions that perforate code holes and print the equiva cilities for the typing reperforator unit, lent messages on tape. The unit may be equipped drive gears, to provide either fully-perforated or partially for control of the set. perforated (chadless) operation. base, A function box the motor, and various mechanism required Unlike the receive-only send-receive keyboard is equipped is included to provide special functions such as with mechanisms for generating and transmitting unshift on space and signal bell. a teletypewriter signal. Page 3 S ECTION 573-102-100 � Figure 3 - 28 Receive- Only Typing Reperforator Set MOTOR UNITS (Fig. 2) available. The units operate at the same speed and, to accommodate varying load requirements, 3.05 two The motor units that provide mechanical they are available in standard and heavy-duty motion for KTR and ROTR sets are of horsepower ratings. basic types: series governed. ac synchronous and ac/ de The ac synchronous motor is used when the power source is regulated; the ac/ de series governed motor operates either regulated or unregulated power. The lat ter is required where only unregulated power is Page 4 ELECTRICAL SERVICE UNIT (Fig. 4) from 3.06 The electrical service unit serves as the area of concentration for the wiring of ISS 1, SECTION 573-102-100 MOTOR UNIT TYPING REPERFORATOR UNIT 1.,__ BASE ELECTRICAL SERVICE UNIT Figure 4 - 28 Receive-Only Typing Reperforator Set and Reperforator Table Page 5 S ECTION 573-102-100 CONTROL PAN EL TYPING REPERFORATOR UNIT T�Pt ouT ''IJ .., COVER Figure 5 - 28 Miniaturized Receive-Only Typing Reperforator Set KTR and ROTR sets, and provides mounting fa cilities for various electrical components. assemblies and ENCLOSURES 3.07 It may include such optional as semblies as a line (polar) relay, line shunt re lay, rectifier, motor control selector magnet driver . mechanism, The components of KTR and ROTR Sets may be housed in sures: the following enclo The keyboard send-receive typing re and perforator set cover, the receive-only reperfo The set's main power rator set cover, the receive-only miniaturized convenience outlet and fuse, terminal typing reperforator set cover, and the multiple blocks, and interconnecting cables may also be reperforator set cabinets. In addition, tables are included . available for supporting the cover-enclosed sets. switch, Page 6 ISS 1, SECTION 573-102-100 .... TAPE CONTAINER TYPING REPERFORATOR UNIT VARIABLE SPEED GEAR MECHANISM � \ ,. I ' '1 \ \mlffil COVER Figure 6 - 28 Miniaturized Receive-Only Typing Reperforator Set (Cover Open) P ag e 7 SECTION 573-102-100 SYNCHRONOUS MOTOR UNIT TAPE - CONTAINER.:... SLIDE -- CHAD CHUTE Figure 7 - 28 Multiple Typing Reperforator Set VARIABLE FEATURES 4. (c) Variable Speed Drive Mechanisms - Used in place of single-speed gear sets on cer A wide variety of optional features are 4.01 tain Receive-Only Sets, this feature permits available with the equipment. These fea the selection of operating speeds by means of a tures, which provide special operations or con manually operated lever. Typically, speeds of trol facilities, or which serve as an aid in oper 60, 75, and 100 words per minute are available. ation, are in most cases readily installed in the field. Some of these features are described briefly below. (a) Tape Out Mechanisms operate - These automatically or manually to step-out a length of blank or let ters perforated tape for convenience in tape Feed out may be interfering or non-interfering. BackSpace Mechanisms - Operated man- (b) ditions. (e) Contact Mechanisms - A number of electrical contacts are available to provide control of external special equipment or for other applications. reading, timing and These include code letters-figures contact mechanisms. ually or with power-drive, the mechanism retracts tape back through the punch block to Motor Control Mechanisms - Starts or stops the set's motor in response to pre determined signal line or separate line con Feed mechanisms handling. (d) allow erroneously perforated data to be (f) Accessories - Various accessories are available to facilitate tape processing and obliterated by replacement with the letters handling including tape bins, chad chutes, low code combination. tape and tape out alarms, and tape winders. Page 8 ISS 1, SECTIO N 573-102-100 CONTRO L PANEL MULTI P LE TYPING REPERFORATOR i SETS CABINET Figure 8 - Typical 28 Multiple Reperforator Set Cabinet Page9 SECTION 5. 573-102-100 TECHNICAL DATA WEIGHTS AND DIMENSIONS APPROX. APPROX. DIMENSIONS (INCHES) WEIGHT (POUNDS) SET Height Width Depth 13-3/4 17 18-3/4 119 9-1/2 13 14-1/2 48 9-1/4 10 12 40 57-1/2 25-1/2 32-1/2 270 35 20-1/2 18-1/2 50 Keyboard Send-Receive Typing Reperforator Set Receive-Only Typing Reperforator Set Receive-Only Miniaturized Typing Reperforator Set Typical 28 Multiple Reperforator Set Cabinet (Includes Multiple Typing Reperforator Sets) Table .................. SIGNALING CODE .. Sequential five-unit start-stop .0.020 or 0.060 ampere LINE CURRENT ................ . SPEED (operations per minute and words per minute) (Other speeds are also available) ............... 368 opm (60 wpm), 404 opm (67 wpm or 50 baud), 460 opm (75 wpm) or 600 opm (100 wpm) TAPE Type .. ....... .. ..... ... Width. . . . . .. .. . . . .. . .. . Code perforations. ... .. Characters or feed holes per inch. . . ... Standard communications . ............ 11/16 inch . Chadless or fully perforated ..... .. ....... .. .... ... .. 10 PRINTED CHARACTERS . Chadless, 0.120 inch; fully perforated, 0.100 inch Height .................. . . Chadless, 0. 075 inch; fully perforated, 0.046 inch Width................... . ... Along upper edge of chadless perforated tape; Location of printing ......... . between feed holes on fully perforated tape POWER REQUIREMENTS .. .. ....... .... . .... .. .. .... ...115 volts ac, single-phase, . 60 cycles Page 10 TELETYPE CORPORATION SECTI ON 573-118-lOOTC Skokie, Illinois, U.S.A. Issue I, February, 1964 28 TYPING REPERFORATOR DESCRIPTION AND PRINCIPLES OF OPERATION PAGE CONTENTS 1. GENERAL .................. 2 2. DESCRIPTION .............. .. 3 GENERAL................... 3 ROTARY MOTION DISTRIBUTION... 3 SELECTING MECHANISM ........ 4 CONTENTS PAGE RECEPTION AND TRANSLATION. . . A. 8 Sele cting Cam-Clutch and Trip Assembly.. . . . . B. Clutch Operation . . . C. Selector O peration . . . . . . 8 12 .. . .. 13 ORIENTATION.. .. ... .. .. . . .. . 14 TRANSFER . .. ..... . ... . . . .. . 15 TYPEWHEEL AND POSITIONING MECHANISM ............... .. 4 PRINTING, RIBBON FEED, AND 3. 4. 5. PERFORATING MECHANISMS ... .. 4 FUNCTION BOX .............. 5 FRAME ASSEMBLY ............ 5 VARIABLE FEATURES..... ..... 5 TECHNICAL DATA .......... .. 6 APPROXIMATE DIMENSIONS ..... 6 SIGNAL .... .............. .. 6 TAPE...................... 6 PRINTED CHARACTERS...... .. . 6 A. Chadless ................. 6 B. Fully Perforated ........... 6 OPERATING SPEEDS ......... .. 6 SIGNALING CODE ............. 7 GENERAL OUTLINE OF OPERATION ................. 8 SELECTION ................ . 8 GENERAL................... 8 Figure 1 - 28 Typing Reperforator Unit 6. MOTION FOR TYPING AND PERFORATING .. ...... . . . .. . . 15 GENERAL................... 15 FUNCTION CAM-CLUTCH AND CLUTCH TRIP ASSEMBLY. ... . . . 15 ROCKER BAIL 16 © 1964 by Teletype Corporation All rights reserved. Printed in U. S.A. Page 1 SECTION 573-118-100 CONTENTS 7. PAGE .................. 17 TYPEWHEEL POSITIONING ...... 18 A. 18 B. Initiation...... ... ..... ... C. Metering.. .. .... .. ... .... A. General .... .. .. .. .. ..... B. Rotary Positioning ... ....... General .... .... ..... . ... 34 34 34 20 22 D. Tripping and Punch Blocking ... 34 35 E. Storage... ... .... ... . .... 36 Letters-Figures Shift ... . .... 25 25 REMOTE CONTROL NON PRINTING ....... ... ...... ... 26 INTERFERING LETTERS TAPE FEED OUT .................. 36 RIBBON FEEDING . . .... ....... 27 AUTOMATIC NON-INTERFERING LETTERS FEED OUT ..... ..... 36 C. D. E. Axial Positioning . .. .... .... Correction...... ..... ..... TAPE PERFORATING AND FEEDING .... ... .. .. ........ GENERAL ................... 27 A. General ..... ... .. B. Initiation.. ...... .. . . ... 36 . ... 37 37 37 27 C. Metering and Feed Out D. Non-Interference .... PERFORATED UNITS .......... 27 BACK SPACE MECHANISMS .. PERFORATING - CHADLESS UNITS........... ..... ...... 28 A. B. General .. .... .......... . Manual Back Space (Fully Perforated Tape) .... . . ..... C. Manual Back Space (Chadless PERFORATING - FULLY- FEEDING - FULLY-PERFORATED AND CHADLESS UNITS.......... 9. PAGE REMOTE CONTROL NON INTERFERING BLANK TAPE FEED OUT .................. 17 TYPING GENERAL 8. CONTENTS 30 CONTACT ASSEMBLIES ......... 30 A. Selector Mechanism Timing Contacts .... .. .. .... ..... B. Letters-Figures Contacts.. .... C. Signal Bell Contacts . .... .... D. End of Feed Out Timing Contacts ...... ...... ..... E. Code Reading Contacts. ....... 30 30 32 32 32 37 Tape) ...... ...... ....... D. Power Drive Back Space ...... 30 VARIABLE FEATURES.... .. .. .. .... .... 37 39 39 39 1. GENERAL 1.01 The 28 typing reperforator is an electromechanical unit wh ich records informa tion on tape, both as printed characters and as code perforations. The information is received from a signal line in the form of an electrical signaling code (teletypewriter code), which is Timing Contacts ..... ... .... 32 translated into mechanical motions to type and perforate the tape. The typing reperforator is UNIVERSAL FUNCTION BLADE.... 32 tape unit (Fig. 4) and the chadless tape unit F. available in two variations: The fully-perforated (Fig.2). A number of also available. PRINT SUPPRESSION ON FUNCTION ....... ..... ...... 32 INTERFERING LETTERS TAPE FEED OUT .................. 32 A. B. C. General ....... ...... ... . Initiation . ..... ........... Termination ... ........... D. Solenoid Operation ... ....... Page 2 32 33 33 33 1. 02 variable features are Unless stated to the contrary, references in the text to "left" or "right" indicate the operator's right or left, facing the front of the unit, the selector mechanism at the right and the punch mechanism at the left. In illustra tions, unless specifically labeled otherwise, it is assumed that the equipment is being viewed from the front. Pivot points are shown in the drawings by circles or elipses which are solid ISS 1, SECTION 573-118-100 black to indicate fixed points and crosshatched partially punched to indicate floating points. along the upper edge of the tape (Fig. 2). Ex cept for these differences, the units are other 1. 03 ( hinged chad) tape and prints The unit is referred to as being in the wise idling condition when the main shaft is scribe the mechanisms that comprise the units. turning, the signal circuit is closed, so that no identical. The following paragraphs de Refer to Figures 2, 3, and 4. message is being received. The unit is referred to as running open when the main shaft is t urn ROTARY MOTION DISTRIBUTION ing and no signal is applied to the selector mag Rotary motion from an external source nets. 2.02 2. uted by two cam-clutch assemblies. is received by a main shaft and distrib DESCRIPTION External changes in speed of the driving power, through a gear shift mechanism or gear changes, per GENERA L mit 2.01 changes from The fully-perforated tape typing reper minute in forator unit prepares fully punched tape speed. The and prints between the feed holes (Fig. 4). chadless - tape prepares typing reperforator the 60 to 75 or 100 words per typing reperforator A rocker bail further operating distributes the motion to the mechanisms involved in printing and perforation. RIBBON MECHANISM SELECTOR MECHANISM PRINTING MECHANISM TYPE WHEEL POWER DRIVE BACKSPACE MECHANISM PERFORATING MECHANISM Figure 2 - 28 Typing Reperforator Unit - Chadless Tape ( Left Front View) Page 3 SECTION 573-118-100 RE MOTE CONTROL NON -INTERFERING LETTERS TAPE FEED OUT M ECHANISM (BLANK TYPE NOT ILLUSTRATED) SELECTOR MAIN SHAFT MECHANISM TRANSFER MECHANISM Figure 3 - 28 Typing Reperforator Unit - Fully Perforated Tape (Left Rear View) SELECTING MECHANISM rotary positioning mechanisms in conjunction with a correcting mechanism select the proper 2.03 A selecting mechanism, which includes a two-coil magnet wired to the characters by moving the typewheel. signal line, converts the electrical code combinations PRINTING, RIBBON FEED, AND PERFORAT into mechanical arrangements which govern the ING MECHANISMS printing and perforation. The magnet may be wired in series for 0.020 ampere operation or in parallel for 0.060 ampere operation. A range finder permits adjustment of the selector in re lation to the signaling code. 2.05 A printing mechanism utilizes a hammer to drive the tape and inked ribbon against the typewheel and TYPEWHEEL AND POSITIONING MECHANISMS 2.06 The ribbon is advanced by a ribbon- feed mechanism. 2.04 imprint the selected char acters. A perforating mechanism The characters used in printing are em- steps the tape, punches feed holes and perfo bossed rates chadless (or fully perforated) code holes on a bakelite typewheel which may be replaced to obtain different type faces corresponding to the code pulses received and character arrangements. the selecting mechanism. Controlled by the selecting and transfer mechanisms, Page 4 axial and by means of a handwheel. by The tape is threaded ISS 1, SECTION 573-118-100 TIMING CONTACTS FUNCTION BOX I J LETTERS - FIGURES CONTACT ROCKER BAIL ASSEMBLY SHIELDED ---"'1!,\-J. CABLE AUTOMATIC NON-INTERFERING LETTERS TAPE FEED OUT MECHANISM FRAME SPROCKET Figure 4 2.07 - 36 POINT RECE PTACLE AXIAL POSITIONING MECHANISM 28 Typing Reperforator Unit ( Front View ) ( Fully- Perforated Tape) Printing and perforating occur simulta- through which the necessary electrical and mo neously at a punch block, but the char tive power connections are made. A 36-point acters are printed six spaces to the right of the connector for all electrical input requirements corresponding is provided. code combinations. The type wheel is retracted at the end of each operation to make the last printed character visible. FUNCTION BOX 2.08 VARIABLE FEATURES 2.10 A function box enables the unit to per form various auxiliary functions includ ing the letters-figures shift, unshift on space and signal bell. A number of variable features are available with the typing reperforator. These features, some of which are described below and in par. 5, enable the unit to perform special operations and may be installed either at the factory or in the field. FRAME ASSEMBLY ( a) 2.09 A cast frame provides mounting facili ties for the various mechanisms which comprise the typing reperforator. The frame is equipment in turn mounted on associated Contact Mechanisms - These mecha- nisms furnish electrical pulses for re mote use. They include timing, code reading, and audible contacts. and visual indicator actuating Page 5 SECTION 573-118-100 (b) Backspace Mechanisms - Two types are available: drive. They are used basic to retract the tape in order to erase (obliterate) an error. (c) Tape F eed-Out Mechanisms different - Several methods permit the inclusion of a predetermined length of blank or letters perforated tape following the perforation of a message. TECHNICAL DATA 3. manual and power The extra length of tape facili APPROXIMATE DIMENSIONS Width . 7-1/2 inches Depth ....... 6-1/2 inches Height. ..... 8 inches 7-1/2 pounds Weight ... .. . SIGNAL tates tape handling.Normally, the interfering Code .. tape feed out mechanism operates at the end Current Sequential, 5-level, start-stop 0.020 or 0.060 ampere .. . . . of a message. A message can not be received during the feed out period. The non-interfer ing tape feed out mechanisms have provisions for operating messages that are received during the feed-out period. The mechanisms may be operated automatically, manually, or by remote control. (d) Standard communications Type . Width .. . . . . . . Perforations .. Five-level, chadless or 11/16 inch fully perforated (deter- Print Suppression on Function - This feature prevents the printing of a pre determined character when the character or function is selected. (e) TAPE mined by unit) Holes/inch . . . ... .. .. . . . . . . . . . ... 10 Feed holes and code holes in line PRINTED CHARACTERS Universal Function Blade - This blade contains removable tines so that it may be coded to accommodate any desired func A. Chadless Height tion box requirement. Standard .. 0.120 inch Maximum . 0.193 inch Width 2'. 11 the typing reperforator Standard .. 0.075 inch unit is a unit that contains an additional Maximum . 0.085 inch A shaft variation that of enables its perforator and typing mechanisms to be operated at a different speed B. Fully Perforated from that of its selecting mechanism. It is used in applications such as the Automatic Send-Re Height 0.100 inch ceive Set and is described in another publication. Width . 0.046 inch OPERATING SPEEDS Unit Code O.P.M. Baud 7.00 390 45.5 7.00 428.6 50.0 7.00 636 74.2 7.00 643 75.0 7.42 368 45.5 7.42 7.42 404 460 50.0 56.9 7.42 7.50 600 364 74.2 45.5 7.50 400 50.0 7.50 600 75.0 Pulse Lgth Freq 0.022 0.020 0.0135 0.0133 0.022 0.0175 0.020 0.0135 0.020 0.022 0.0133 22.75 25.0 37.1 37.5 22.75 25.0 28.45 37.1 22.75 25.0 37.5 6.5 7.1 10.6 10.7 6.0 6.7 7.7 10.0 6.1 6.7 10.0 75 100 Char. Per Sec. Words Per Min. 65 71.4 106 107 60 67.3 .. L... Page 6 60.6 - - --- L.. 66.6 . · - 100 ISS 1, SECTION ( ( ( SIGNALING CODE element (always spacing ) and are followed by a stop element (always marking ). The start and (Fig. 5) stop elements provide for mechanical synchro nization between the transmitting and receiving equipment. A graphic illustration of the mark The typing reperforator operates on the principle of electromechanical conver 3.01 573-118-100 sion of message characters (see Fig. 5) in terms of a signal code. Teletypewriter equip ing and spacing element in each sequence ap ment utilize the Baudot code, a five-unit start stop signaling code, in which each character or function is represented by a combination of marking current and spacing current time in pears in Fig. 5. All five elements are marked in the letters code. The blank code is comprised of five spacing elements. tervals. In a polar signal circuit,intervals dur 3.03 ing which current flows in a positive direction are referred to as marking elements, and in tervals during which current flows in the oppo site direction as spacing elements. In a neutral five unit code is two to the fifth power, or 3 2. In order to transmit more than 3 2 char acters and functions, a letters-figures shift op eration is designed into the equipment. This signal circuit, intervals during which current flows in the circuit are referred to as marking elements, and intervals during which no current permits each permutation, excluding those used to shift and unshift the apparatus, to represent two characters or functions. The total number of permutations of a flows as spacing elements. 3.04 five The typing reperforator may operate with a 7 .00, 7 .42, or 7.50 unit transmission elements that carry the intelligence, each of which may be either marking or spacing. The intelligence elements are preceded by a start pattern (see Operating Speeds in par. 3). The signaling frequency is expressed in dot cycles per-second, one cycle consisting of a positive 3.0 2 Every code combination includes TRANSMISSION SEQUENCE 7.42-UNIT TRANSMISSION PATTERN ( s START - ALWAYS SPACING NO.1 - MARKING OR SPACING NO. 2 - MARKING OR SPACING NO. 3 - MARKING OR SPACING NO.4- MARKING OR SPACING NO. 5 - MARKING OR SPACING STOP - ALWAYS MARKING FOR GRAPHICAL REPRESENTA ----1 TION OF LETTER ''Y", SEE FIG. 6 ( a. ¢ I 4 /;). 5 7 FIGURES - ? : $ 3 ! att 8 ' ( ) LETTERS A B C D E F G H I J K L M N 0 p Q R S T I 9 ; 2 I 6 " II < :.: U v w X y z a:u: � ..J m I •• •• • •• 2 • • • • •• • FEED HOLES 0 0 0 0 0 0 0 0 0 0 0 0 0 0 ( 3 4 5 ----- � �-- • • • • • • • • • • • • • • • Figure d.J • ••• •• • • •• 0 0 0 0 0 0 0 0 0 0 0 0 • • • • • • • • • • • • • • • •• • • • •• • • I• • • • • (TYPICAL CHARACTER ARRANGEMENT ) - I w <..) '+' ..t, a: <.!) � � ii: • • • • • 0 0 0 0 0 0 • • • • • • • -� b. 5 - Signaling Code Page7 573-118-100 SECTION current pulse. pulse followed by a negative current The equipment speed in baud is equal to tioning mechanisms, which select the type-wheel character to be printed. twice the frequency. Speed in words per minute is roughly equivalent to one-sixth the operations 4.05 The punch slides, having received their arrangement per minute. from the selector, cause the punch pins to perforate code holes in the 3.05 Marking elements in the intelligence code tape corresponding to the code pulses received are represented spacing by the selecting mechanism. Late in the function The row of cycle, the tape feed parts advance the tape one by holes and elements by the absence of holes. smaller holes between the second and third character space. then disengaged the code permutation. again tripped by the selecting cam-clutch or by and remains stationary until a tape feed-out mechanism. GENERAL OUTLINE OF OPERATION The operations of the reperforator may overlap if the code com binations are being received fast enough. 4.01 The relationship of the operating mechanisms of the 28 typing reperforator are illustrated in the block diagram (Fig. 6). Rotary For ) example, while the perforating mechanism is punching the code combination, advancing the " tape and the printing mechanism is printing, the motion from an external source is applied to the selecting mechanism may main shaft through a sprocket driven by a timing next code combination. belt (Fig. 7). "'� The function cam-clutch is levels are tape feed holes and do not enter into 4. /� be processing the The main shaft rotates constantly An 0.020 or 0.060 ampere signal to the selector magnet is 5. externally GENERAL as long as the unit is under power. supplied. External electrical cir SELECTION cuitry is supplied through a 36-point connector at the rear of the unit (see Fig. 3). 5.01 The selecting mechanism, made up of a selector 4.02 The signaling as the code combinations, such combination representing the (5.07), signaling code combinations graphic Y, plotted at the left of Fig. 6, are ap arrangements which plied perforation. to the selecting mechanism. The start a clutch trip assembly (Fig. 8) and a cam-clutch (Fig. 7), translates the into mechanical govern tape printing and The electrical pulses comprising pulse of each code combination causes the se each code combination are applied to a magnet lector, through a trip assembly, to trip the se of the selector. lecting cam-clutch. ture, controls the clutch trip assembly and the The main shaft then im parts motion to the cam-clutch throughout the parts associated with clutch transfers timed motion to the selector The cam-clutch mechanism, translation. The cam in turn, transfers timed motion to the selector, and which converts the intelligence pulses of the code means of a range finder assembly (Fig. 8), the combination into arrangement. a corresponding also trips the function cam-clutch. By mechanical selecting mechanism can be adjusted to sample Near the end of the selecting cy the code elements at the most favorable time cle, the cam-clutch actuates the function trip for optimum operation. assembly. rangements produced by the selecting mechan The latter trips the function cam clutch to operate the printing and The mechanical ar perforating ism are passed on through the transfer mech mechanisms. The selecting cam- clutch is then disengaged and remains inoperative until the mechanisms (5.12) and through the punch slides next code combination is received. to control the perforating mechanism (5.09). 4.03 The function cam-clutch, driven by the main shaft, imparts motion to the rocker bail throughout the function cycle. The rocker bail perforating transfers mechanism, the the motion to positioning tape feed mechanism and the mechanisms, the the printing mech anism. 4.04 The transfer mechanism, having received arrangement from the selector, causes positioning of the axial and rotary posi- PageS anism to control the positioning and printing ) �,\$:, " RECEPTION AND TRANSLATION A. Selecting Cam-Clutch and Trip Assembly (Fig. 7 and 8) 5.02 The selecting cam-clutch assembly includes (from right to left in clutch, their ) The magnet, through an arma selecting cycle. " the stop arm bail cam, the Fig. 7) the fifth, the fourth and the third selector cams, the cams for the spacing and the marking lock levers, the second and the first selector cams, the selector reset bail cam and the function trip cam. .'¥#) The "J ISS 1, SECTION 573-118-100 CODE REPRESENTATION OF LETTER "Y" 3 2 4 5 I ,- SELECTING MECHANL<:JM PERFORATOR MECHANISM STOP - --------- -- ...._..-SIGNAL LINE ...,. - -t SELECTOR !jllji�--·��-- PUNCH PUNCH SLIDES BLOCK � Lo TRIP ASSEMBLY MAIN BAIL TAPE ASSEMBLY FEED PARTS • rrl KEY TRANSFER (ELECTRICAL) • (MECHANICAL) .- - -.... (ELECTRICAL) SELECTING TRANSFER OF INTELLIGENCE (MECHANICAL) TRANSFER OF POWER OR MOTION -- - - .... I ---- .. MECHANISM t � XJ 0 FUNCTION BO I MECHANISM .... CAM-CLUTCH 0 0 0 oo 0 0 --·· � ASSEMBLY • 0 0 ROTARY POSITIONING MECHANICAL CONNECTION u 0 MECHANISM h 0 I r:.:l >-��� o< � g� 0 0 0 0 0 0 0 0 0 • AXIAL POSITIONING MECHANISM Pr TYPEWHEEL ' LJ I FUNCTION MECHANISM (It -·-- POWER SWITCH I-+• MOTOR UNIT � 1- ----.... � L-+- � TRIP CORRECTING 1--1 ASSEMBLY MECHANISM A It PRINTING MECHANISM + FUNCTION AM-CLUTCH ASSEMBLY !... ROCKER BAIL ASSEMBLY I �---��-_. I RIBBON FEED • MECHANISM Figure 6 1--- - 28 Typing Reperforator Unit, Block Diagram 9/10 ISS 1, SECTION 573-118-100 SELECTING CAM-CLUTCH ( I RESET BAIL CAM SPROCKET I NO. 1 SELECTOR CAM ( FUNCTION CAM-CLUTCH ( NO. 2 SELECTOR CAM NO. 3 SELECTOR CAM ( NO. 5 SELECTOR CAM (LEFT SIDE VIEW) Figure 7 - Main Shaft ( cam clutch is controlled by the selector through the clutch trip assembly (Fig. 8). During the time in which the signal circuit is closed (mark ing), the selector magnet coils are energized and hold the selector armature up against the magnet pole pieces. In this position, the arma ture blocks the start lever, and the cam- clutch is held stationary between the stop arm and latch lever. When a code combination is received, the start element (spacing) de-energizes the magnet, and the selector armature under tension of its spring moves down out of the way of the start lever. The start lever turns clockwise under spring pressure and moves the stop arm bail into the indent of the start cam (Fig. 8). As the stop arm bail rotates about its pivot point, the attached stop arm is moved out of engage ment with the clutch shoe lever. The selecting 5.03 ( l cam- clutch engages and begins to rotate coun terclockwise. The stop arm bail immediately rides to the high part of the cam, where it re mains to hold the start lever away from the ar mature while the intelligence pulses of the code are received and processed by the selector (5.07 to 5.09). When the stop element at the end of the code combination is received, the arma ture is pulled up and blocks the start lever. Thus the stop arm bail is prevented from drop ping into the low part of its cam, and the attached stop arm is held in position to stop the clutch 5.04 shoe lever. When the clutch shoe lever strikes the stop arm, the inertia of a cam disk causes it to continue to turn until its lug makes contact with the clutch shoe lever. At this point, a latch lever drops into an indent in the cam disk, and the clutch is held disengaged until the next code combination is received. Page 11 SE CTION 573-118-100 "'�) STOP ARM BAIL CAM INDEXING LOCK STUB I RANGE FINDER ," " RANGE SCALE / KNOB RANGE FINDER SECTOR ") "''- /;]'))i '\START � LEVER 7 MAIN ,) SHAFT STOP ARM BAIL CLUTCH DISK CAM DISK LUG ,y) STOP ARM Figure 8 - R ange Finder and Selecting Cam- Clutch Assembly B. and thus releasing stop lug A and the lower end Clutch O peration (Fig. 9 and 10) of shoe lever B 5.05 (Fig. 9). The upper end of The clutch drum is attached to and ro- lever B pivots tates in unison with the main shaft (Fig. against the upper end of the secondary shoe, and 7). In the Fig. 10, disengaged the clutch do its ear C, which bears in moves its ear D and the upper end of the primary not contact the shoe toward the left until the shoe makes con position, shoes about as shown drum, and the shoes and cam disk are held sta tact with the notched inner surface of the ro tionary. Engagement is accomplished by mov tating drum at point E. As the drum turns coun ing the stop arm (Fig. 8) away from the clutch terclockwise, it drives the primary shoe down- Page 12 J 4� ISS 1, SECTION 573-118-100 ( f ward so that it again makes contact with the drum at point F. There, the combined forces acting on the primary shoe cause it to push against the secondary shoe at point G. The lever end of the secondary shoe then bears against the The drum drives this shoe drum at point H. upward so that it again makes contact with the drum at point I. The f orces involved are mul tiplied at each of the preceding steps. The ag gregate force is applied through the shoes to the lug J on the clutch cam disk, and the disk and attached cam turn in unison with the drum 5. 06 end of shoe lever B strikes the stop arm (Fig. 8). Lug A and the lower end of the shoe lever are brought together (Fig. 9), and the up per 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 to gether and away from the drum. The latch lever seats in the indent in the cam disk(5.04}and the cam is held in its stop position until the clutch is again engaged. . C. 5.07 ( Disengagement is effected when the lower Selector Operation (Fig. 7, 8 and 11) The selector assembly consists primarily of two magnet coils (Fig. 8), an arma ture and· associated bails, levers and latches (Fig. 11). Five linkages, each of which consists of a selecting lever, a push lever and a punch slide latch, link the selector cam with the punch slides. Since the linkages are identical, only the No. 4 is shown in its entirety in Fig. 11. As the selecting elements of the code combination are applied to the magnet, the cam actuates the selecting levers. When a spacing element is re ceived, a marking lock lever is blocked by the end of the armature, and a spacing lock lever swings to the right above the armature and locks it in the spacing position until the next signal transition occurs. Extensions on the marking ( lock lever prevent the selecting levers from following their cams. When a marking element Figure 9 - Clutch, Engaged is received, the spacing lock lever is blocked by the end of the armature, and the marking lock lever swings to the right below the armature and locks it in the marking position until the next signal transition occurs. During this marking condition, the selecting levers are not blocked by the marking lock lever extensions, but are permitted to move against their respective cams. The selecting lever that is opposite the indent in its cam, while the armature maintains a marking condition, swings to the right, or se lected, position, and the end of an associated ( push lever falls off a step on the selecting 1ever. 5.08 together with any selected push levers, are moved to the left by the high part of their respective cams, where they remain until the next code combination is received. The un selected push levers remain to the right. When ( t As the cam rotates, the selecting levers, the next code combination is received, a selector Figure 10 - Clutch, Disengaged reset bail, lifted by its cam (Fig. 11), strips the selected push levers from the selecting levers, and the push levers are returned to the right by their springs. Page 13 SECTION 573-118-100 ARMATURE �, SPACING LOCK LEVER ) SELECTOR RESET BAIL ' MARKING LOCK LEVER NO.4 PUNCH SLIDE LATCH ) PUNCH SLIDE LATCHES '' NO. 4 PUNCH SLIDE ) PERFORATOR RESET BAIL " Figure 11 - Selector 5.09 The selected push levers, in moving to the left, rotate associated punch slide latches counterclockwise (Fig. 11). Just before the fifth push lever is selected, the selecting cam through the functi