Kleinschmidt, as a Division of SCM Corporation, continues to supply the Military and also commercial users with teleprinter equipment. The conclusion of this chapter tells briefly the direction the Kleinschmidt Division is going in the printed communications field.
Before the Kleinschmidt 100-words-per-minute teleprinter was put into service on intercommunicating circuits, the operating speed on standard circuits had been limited to 60 words per minute. Noting this important change in operating speed, other manufacturers had to redesign their teleprinter equipment to meet the new 100-words-per-minute speed.
Teletype Corporation came up with a new design, the No. 28, in which all the type pallets are moveably mounted in a rectangular box that is positioned to move a selected type pallet into printing position by a system of levers operated in aggregate motions under control of the code selecting mechanisms ([fig. 15]). When so positioned, a print hammer strikes the type pallet to print the character.
Creed, in England, later brought out a new design, their No. 75, using a segmented typewheel having four rows of type faces. The typewheel is set in the selected printing position by a lever and linkage system operating in aggregate motion under control of the code selecting mechanism. To print the selected character, the typewheel is struck against the printing paper ([fig. 16]).
Siemens and Halske, in Germany, produced their No. 100, a redesign of the No. 15 Teletype, using lighter and faster moving parts for operation at 100 words per minute. Among other improved features were a type bar shift to replace the platen shift for printing letters or figures, and a two-color ribbon which is automatically shifted to print in red or black to distinguish between sent and received messages—a feature of convenience in TELEX communication. The Siemens No. 100 was designed especially for the TELEX system, operating at 66 words per minute, where it is used extensively ([fig. 17]).
Fig. 15 Teletype Corporation Model 28 100-words-per-minute TeletypewriterPicture through courtesy of Teletype Corporation
Fig. 16 Creed & Company Ltd. Model 75 Teleprinter with attachmentsPicture by courtesy of Creed & Co. Ltd.
