Browse Prior Art Database

Operator View for Printer

IP.com Disclosure Number: IPCOM000077026D
Original Publication Date: 1972-May-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 2 page(s) / 41K

Publishing Venue

IBM

Related People

Malmros, GVA: AUTHOR [+2]

Abstract

This system allows an operator to view the most recently printed character by moving the print head to one side in response to depression of VIEW key 1. When the operator wishes to look at the last characters printed, the VIEW key 1 is depressed which sets latch 2 and initiates the operation of a 20-position up-down counter 3. The number of counts is selected so that the print head is moved far enough to one side to permit easy viewing by the operator.

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Operator View for Printer

This system allows an operator to view the most recently printed character by moving the print head to one side in response to depression of VIEW key 1. When the operator wishes to look at the last characters printed, the VIEW key 1 is depressed which sets latch 2 and initiates the operation of a 20-position up- down counter 3. The number of counts is selected so that the print head is moved far enough to one side to permit easy viewing by the operator.

An output signal from counter 3 is gated through interlock circuit 4, which is conditioned to pass a signal only when the printer is not in the automatic mode. The counter signal sets the driver triggers 5 to energize amplifiers 6 for a single- step rotation of head drive motor 7. When motor 7 rotates, encoder wheel 8 operates to generate a signal from transducer 9. Encoder amplifier 10 operates to shape the signal into a pulse and applies it to counter 3, causing the counter to increment and produce another step of rotation by motor 7.

When counter 3 has reached full capacity of 20 counts, no further signals are applied to driver triggers 5. At this point, motor 7 will have rotated lead screw 11 through a sufficient number of steps, to move print head 12 to one side of the last printed character on the medium over platen 13.

When VIEW key 1 is allowed to return to the normal position, latch 2 restores to the reset state and sets reversing circuit 14. This causes a countdown signal to be...