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Synchronous Input To An Asynchronous Device

IP.com Disclosure Number: IPCOM000097233D
Original Publication Date: 1962-Jul-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 78K

Publishing Venue

IBM

Related People

Krygowski, M: AUTHOR [+2]

Abstract

Data available at regular intervals can be supplied to an intermittently operating mechanical device only at specified times. Controls compensate for the relative speeds of a synchronous input and an asynchronous device.

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Synchronous Input To An Asynchronous Device

Data available at regular intervals can be supplied to an intermittently operating mechanical device only at specified times. Controls compensate for the relative speeds of a synchronous input and an asynchronous device.

A printing head is intermittently struck against paper under power from a continuous drive which is applied via a clutch, shaft and print cam. When engaged, by operation of the clutch solenoid, the clutch causes clockwise shaft rotation. The print cam drives the head against the paper when the shaft rotates to position c. Cam 1 closes contacts C1 for the interval between shaft positions b and d. Contacts C2 are closed by cam 2 during the interval between positions a and e.

Characters to be printed by the head are selected by a head positioner in accordance with input data stored in a register. Entry of new data into the register occurs whenever gate 0 is operated, by a trigger controlled by contacts C1 and C2. The control circuit has two triggers T, delay circuit D, inverter I and And's & having true inputs (arrows) and inverted inputs (semi-circles). Normally, when the clutch is engaged, the print trigger operates to gate input data into the register, whenever data is available at the input. However, this is not done during a critical period of shaft rotation when the clutch is in the process of disengaging. The critical period starts at d, when the clutch can be disengaged. It ends at e when disengage...