INTRODUCTION to Teletypesetter Operating Unit by Fairchild Teletypesetter Corp.
The TOU 75, Teletypesetter Operating Unit, is designed to operate all models of modern high output linecasting machines (Linotype Elektron, Comet and Intertype Monarch) at or beyond their rated capacity. A six-unit fully perforated tape is the medium of control.

Functionally the operating unit performs as follows: operates the required keylevers and the assembling elevator; controls the upper and lower rail (duplex rail) position; provides for the necessary delay of tape feeding during the positioning of the duplex rail; Automatically recognizes a repeat character or digit and provides a one-cycle delay between each repeated character; operates electrical contacts to provide regulated pulses for the control of auxiliary circuits; and provides an electrically operated safety feature for idling the machine in case the perforated tape ends, becomes taut or in the event that certain conditions arise in the linecasting machine.

The perforator operator may justify certain short lines by back spacing the tape and perforating the O -Code (thin-space) in each space band (3-Code) perforation to increase the spacing between words. When the 0-3 combination is sensed by the operating unit, the add-thin space functions to drop the space band and the thin space matrices in sequence.

The code combination for the various functions and characters are shown in the figure below.

An electrical control is incorporated in the Operating Unit to provide control of assembly when spacebands are delivered. It may be adjusted for optimum control of the individual linecasting machine. In addition, an electrical tape stop mechanism is incorporated. This mechanism may be wired to a chosen code lever contact and will idle the machine when the code for the lever is sensed.
A reset button for restarting the machine is provided.


Bottom view of the TOU directly under the Selector Assembly (above). Sorry for the poor quality photo. Ill try to explain what happens under here.

Contact Code Bars: These code bars are pressed downward with every cycle of the TOU allowing the Code Bar Extensions (see above picture of Repeat Character Delay Assembly) to move freely. If one of the 7 Contact Code Bars teeth combination matches up with the code bar extensions notches the following functions (electrical or mechanical) take place.

Contact Code Bar:
1. Upper Magazine
2. Lower Magazine
3. Quad left signal (hydraquadder)
4. Quad center signal (hydraquadder)
5. Stop code Stops TOU reading tape
6. Upper/Lower Rail (italic)
Add Thin Space
   (spaceband + thinspace)

To obtain a quad right signal the TTS Perforator operator inserted a Quad Left Code + Quad Center Code.

This combination would cause the Mergenthaler Hydraquadder and Star Parts Electric Quadder to Quad Right.
Intertype never had an electric quadder that Im aware of.

On the two ACE Electron 4 Magazine Mixer Machines at Wisconsin Cuneo Press, Milwaukee, WI . there was a Super Shift Code that would send control signals to a panel of relays that allowed us to move magazines to pair mag. 1 & 2; 2 & 3 and 3 & 4. We also had the mold selection feature that turned the mold disk to use mold: 1, 2, 3 or 4. The auto ejector was pre-programmed with pins for different length lines. Mold sensor relays would auto control setting of knife block. No measure control. We chose to set the vise jaws to the longest measure required.

When setting shorter lines (slugs) we used pica and 1 pica blank space matrices in magazine channels 60 and 46 respectively to fill the space.

For yellow page telephone directory work it required 2 different length lines. This eliminated the need for  cutting lines (ad makeup - floor saw) to fit the space.

All lines for ads were on same galley and set to proper length.    It worked great!

The Blocking Bar operation is quite important. Its got everything to do with repeat characters. Like the word look with double o

The Blocking Arm Latch and Repeat Blocking Arm are almost one in the same.

The Repeat Blocking Arm moves to the left and right for each character in a line of type. If the tape reading selector pins recognize the same code in succession (excluding a rub out 012345) the Repeat Blocking Arm does not move which allows the Blocking Arm Latch to hook onto the Tape Feed Blocking Arm Upper Extension and prevents the paper tape from advancing beyond the second o. Next cycle of TOU and the o will be selected, the tape will advance to the next punched code in the paper tape


After reading the description (above) how the repeat character function works I thought it best that I include a picture of just where the Blocking Arm Latch hooks up to what arm?

Thats why most manuals are marked with numerous greasy finger prints. Youre reading things on page #24 where the text refers to something that isnt pictured on that page. The search begins back/forth thru pages until you come upon a recognized word or picture on page #34.

Top View - left - does not show the latch plate that closes over paper tape that holds paper tape securely when reading pins rise up to read punched code holes in tape.

See Yellow Square around punched holes. Small red letters above the punched holes = boloney!
n : pretentious or silly talk or writing


This is the pin (to left) that reads a hole in the paper tape.

There are 6 of these levers to read the 0-1-2-3-4-5 code holes punched in the paper tape. This info is transferred to the selector levers which move to the right when the pin recognizes a hole in the tape. In the old TTS language from the 1930 era, Teletypesetter Corporation from Chigago, Il, this reading a hole in the tape was called a mark. No hole in the tape was called a space.

All those marks and spaces cause the Transfer levers (6 of them) to pivot on a stationary rod which causes the code bar extensions to move left or right.

The code bar extensions are connected to 6 code bars located in the TOU which hangs on the keyboard and extends toward the base of the linecasting machine.

The 6 transfer levers are depressed downward, allowing the selector levers to swing left/right freely, at the moment the selector lever pins read the holes in the tape (on top plate). At the precise degree in the cycle the transfer levers are allowed to rise and take a reading from the 6 selector levers. (see up/down red arrows)

When the round bottom part of the 6 transfer levers in slot on 6 Code Bar Extensions (large red arrow to left) get moved to left/right (mark or space) Remember, the code bar extensions are connected to the code bars located in the TOU which hangs on the keyboard. Those code bars reach from the right side to the left side of the keyboard. When the codes in the paper tape are read and a lower case b is needed the code bars will be positioned to allow the correct push bar to be selected which in turn moves a bell crank lever to tilt forward and depress a keylever extension. That keylever will cause the lower case b cam to fall down and ride on the keyboard cam rubber roll for one revolution.  This will cause a reed (long thin piece of metal) to push upward and  select a lower case b from the magazine (holds the matrices) on the hotmetal machine. The matrice falls out of the magazine onto an assembly belt and is delivered into the assembling elevator.

If no matrice (matrix) falls out of the magazine there is another attachment that all teletype setter operated machines had. It was called a Mat Detector. I will create a page for that subject by itself. I dont have any pictures of a Shaftstall Mat Detector and would appreciate any help I can get with some pictures. Their address was Shaffstall Equpt. Inc., Indianapolis, In.

Note: I dont have a manual on theory of operation from the time a pin or pins select read holes in the paper tape, then X-mit choices to the keyboard causing a matrice to fall into the assembling elevator. Im using my own words while looking at the adjustment manual Bulletin 75B Adjustment and Lubrication for the TOU 75 Operating Unit. jer

If some viewer sees an error, let me know, and Ill correct the words etc.

Upper - Lower Rail (Flap - NO Flap) Selector or Lateral Rail, all words refer to the same levers.

Located on left side of keyboard, this mechanism is attached to the Assembling Elevator.

The front plate of the assembling elevator has to be rebuilt with a different type of rail which moves to right causing succeeding matrices to align the auxiliary matrice character to be aligned for casting.

When paper tape sends upper rail code to TOU, lateral rail moves right. Lower rail code will move lateral rail to left.

When casting machine operated manually operator will push/pull manual lever to move lateral rail right/left

chatillon scales or from new york has to be completed