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Browse Prior Art Database

Pneumatic Typewriter Control

IP.com Disclosure Number: IPCOM000077596D
Original Publication Date: 1972-Aug-01
Included in the Prior Art Database: 2005-Feb-25
Document File: 3 page(s) / 54K

Publishing Venue

IBM

Related People

Castle, WH: AUTHOR [+2]

Abstract

A typewriter having a keyboard operated slide translator for pneumatically controlling a bidirectional spacing mechanism, similar to that of Belgian patent 767,627, is provided with improved "Backspace" and "Expand" controls. Normally, depression of backspace key 10 mechanically sets slides in translator 11 so that a pneumatic pulse from pump 12 is gated to backspace conduit 13, to operate backspace select actuator 14 in the space control mechanism 15. A measuring device, not shown, in the space control mechanism 15 is preferably set to normally produce a five unit space increment, unless set otherwise by selection of actuators 17, 18, 19 or 20.

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Pneumatic Typewriter Control

A typewriter having a keyboard operated slide translator for pneumatically controlling a bidirectional spacing mechanism, similar to that of Belgian patent 767,627, is provided with improved "Backspace" and "Expand" controls. Normally, depression of backspace key 10 mechanically sets slides in translator 11 so that a pneumatic pulse from pump 12 is gated to backspace conduit 13, to operate backspace select actuator 14 in the space control mechanism 15. A measuring device, not shown, in the space control mechanism 15 is preferably set to normally produce a five unit space increment, unless set otherwise by selection of actuators 17, 18, 19 or 20.

Slide translator 11 also responds to depression of backspace key 10 to apply the pneumatic pulse to velocity select actuators 21 and 22, like those described in IBM Technical Disclosure Bulletin Vol. 12, No. 7, December 1969, at page 1032, to select operation of a nonprint type element control cam like that disclosed in U S Patent 3,382,963. The ensuing typewriter operation thus will cause a spacing of five units in the reverse or backspace direction, but the print cycle produced from keyboard depression will not generate a printing impact. UNIT BACKSPACE.

Backspace mode key 23, when depressed, provides alternate control coding for the translator 11. Depression of backspace mode key 23 opens three normally closed valves 24, 25 and 26. Depression of backspace key 10, while backspace mode key 23 is held depressed, causes pressurization through translator 11 of two always open channels 27 and 28, and also pressurization of alternate backspace code channel 29 as well as the normal backspace channel 13. Channel 27 passes air through valve 24 to operate actuators 21 and 22 simultaneously and thereby select nonprint operation. Channel 28 passes air through valve 25 to backspace select actuator 14, to select the right to left increment feed operation. Channel 29 passes the air pulse through valve 26 to one unit selection control actuator 20 in the space control 15, to select one unit of motion in place of the normally provided 5 units spacing. Thus, the normal five unit backspace, upon depression of key 10, is converted into a single unit backspace when the backspace mode key 23 is also depressed. CHARACTER BACKSPACE.

Backspacing can be accomplished in cha...