Browse Prior Art Database

A 5 Channel Paper Tape Typewriter

IP.com Disclosure Number: IPCOM000095315D
Original Publication Date: 1965-Nov-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 3 page(s) / 59K

Publishing Venue

IBM

Related People

Johnson, FW: AUTHOR [+2]

Abstract

U.S. Patent 2 978,086 shows a 5-channel paper tape punch controlled by a typewriter having the usual stenographic 4-row keyboard. The mentioned mechanism automatically inserts the Letters and Figures codes characteristic of 5-channel teletypewriter code. The 5-channel paper tape traditionally is generated from the usual teletypewriter, 3-row keyboard. This requires striking of a Figures or Letters shift key prior to character key selection. The Figures or Letters code is punched upon striking of the shift key. The character code is punched upon selection of a character key. Ordinarily, operators are trained either to type on four rows or on three rows of keybuttons, but not both.

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A 5 Channel Paper Tape Typewriter

U.S. Patent 2 978,086 shows a 5-channel paper tape punch controlled by a typewriter having the usual stenographic 4-row keyboard. The mentioned mechanism automatically inserts the Letters and Figures codes characteristic of 5-channel teletypewriter code. The 5-channel paper tape traditionally is generated from the usual teletypewriter, 3-row keyboard. This requires striking of a Figures or Letters shift key prior to character key selection. The Figures or Letters code is punched upon striking of the shift key. The character code is punched upon selection of a character key. Ordinarily, operators are trained either to type on four rows or on three rows of keybuttons, but not both. The mechanism shown here permits keyboard operation either by an operator trained to type on four rows or an operator trained to type on three rows of keybuttons.

Translating slides 1 are positioned permutably in response to character key selection. Slides 1 operate to position code openings 1a in them to form a continuous path for one of a plurality of typical decoding pins 2, 3, and 4. Each pin 2 corresponds to a keybutton in the front three rows of the usual stenographic typewriter keyboard. Each pair of pins 3 and 4 corresponds to a keybutton in the fourth or numbers row of a standard stenographic typewriter keyboard. Shift status responsive slide 6 selects between pins 3 and 4. This depends on whether the usual keyboard shift key is depressed. Thus, one pin 2, 3 or 4 pierces the entire group of slides 1 and shift slide 6 upon depression of each keyboard keybutton.

A pair of control pins 7 and 8 is controlled by the shift slide 6. By this, in one shift status, pin 7 pierces the entire group of slides. In the other shift status, pin 8 pierces the entire group of slides. slides.

A group of output slides 9 is pierced by the selected pins 2 3 and 4, and controls a punch, not shown, as described in the mentioned patent. Shift code control slides 11 12 and 13 are also pierced by the pins 2 3, and 4 and by control pins 7 and 8. Slides 11 12 and 13 control shift code punching at a second punching station not shown as described in the patent.

Mechanism 14 functions selectively to prevent operation of the slides 11, 12 and 13 to prevent the punching of a shift code except upon changes of shift status.

In operation, depression of a key in the front three rows of the keyboard with the printer in lower case causes selection of a corresponding pin 2. This is selected if the printer is in upper case. Pin 7 is also selected by slide 6. Selected pin 2 permits movement of pre-determined output slides 9 in accordance with long and short holes 9a and 9b in them to control punching of the character code. Slide 13 is not prevented from moving by pin 2 due to long hole 15 nor by pin 7 due to long hole 16. Slide 11 is prevented from moving by pin 7 which pierces short hole 17. Slide 12 is prevented from moving by pin...