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Printer with Asynchronous Incremental Typebar Drive

IP.com Disclosure Number: IPCOM000092796D
Original Publication Date: 1967-Feb-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 46K

Publishing Venue

IBM

Related People

Schaaf, FW: AUTHOR

Abstract

The printer control shown in A uses an incremental drive 10 for actuating typebar 12. Print hammers 14 are activated by drivers 16 through And's represented by And 18 in response to selection of selected ones of latches 20 in response to Compare and Hammer Address signals. Typebar drive 10 is activated through And 22. The latter requires a Print Ready signal and a Compare Complete signal which is obtained when a particular print scan is completed. Delay 24 gates And 18 from And 22.

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Printer with Asynchronous Incremental Typebar Drive

The printer control shown in A uses an incremental drive 10 for actuating typebar 12. Print hammers 14 are activated by drivers 16 through And's represented by And 18 in response to selection of selected ones of latches 20 in response to Compare and Hammer Address signals. Typebar drive 10 is activated through And 22. The latter requires a Print Ready signal and a Compare Complete signal which is obtained when a particular print scan is completed. Delay 24 gates And 18 from And 22.

A wide variation in hammer flight time is permitted. This is because the incremental drive results in negligible typebar motion around the time of hammer impact as shown by the curves a and b of 13. In a system time interval, the drive remains in a standby status until hammer selection is completed.

As shown in C by curve d, flight time changes rapidly with power input. Hammer velocity is shown by curve c. At a high level PH, a small variation AT(H) occurs. At a low level PL, changes due to thermal effects, power supply variation, etc., can cause a large flight time variation delta TL. The asynchronous incremental drive can accommodate relatively large variations with little change in output quality.

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