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Index Pitch Selector and Indicator

IP.com Disclosure Number: IPCOM000086707D
Original Publication Date: 1976-Oct-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 2 page(s) / 56K

Publishing Venue

IBM

Related People

Castle, WH: AUTHOR [+3]

Abstract

A dual-ratchet index mechanism allows the operator to select either of two line-feed pitches. One problem associated with this is a suitable means of indicating what pitch the machine is in at any given time. Described is a solution to that problem, providing, also, a desirable means of switching the hardware to change index pitch.

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Index Pitch Selector and Indicator

A dual-ratchet index mechanism allows the operator to select either of two line-feed pitches. One problem associated with this is a suitable means of indicating what pitch the machine is in at any given time. Described is a solution to that problem, providing, also, a desirable means of switching the hardware to change index pitch.

The figure shows a modified platen knob 10, attached to a slider 12. The platen knob 10, when moved right or left with respect to the machine, performs the index-pitch selection through slider 12.

The knob 10 is large enough and comfortable for the operator to use to perform this function. The pitch-indicating mechanism 14 is included in such a way that it in no way interferes with the operator's use of the knob 10 either when switching index pitch or when normally rotating the platen 16.

The pitch indicator 14 is a series of "windows" 18, or, if preferred, a transparent section completely around the circumference of the platen knob 10. Internal to the knob is a disc 14 which has two rows of pitch symbols 20 and 22 on its circumference. These symbols indicate the number of lines per inch or some other recognizable symbols, such as a triangle (4) 22 and a dot (o) 20, to prepresent fixed pitch and proportional spacing.

When the knob is positioned in one of the two pitch selections, only one of the rows of numbers or symbols is visible. Switching the knob to the other position covers the previously visib...