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Stepping Motor Checking Device

IP.com Disclosure Number: IPCOM000094572D
Original Publication Date: 1965-Mar-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 46K

Publishing Venue

IBM

Related People

Carroll, WC: AUTHOR

Abstract

This checking device verifies either that an incremental tape stepping motor has in fact operated in response to a signal to write a tape character. The device consists of timing disk 10 fixed to motor shaft 11. This is also fixed to capstan 12 that drives magnetic tape 13. Motor 14, connected to shaft 11, is an incremental motor, but can be a continuous motor.

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Stepping Motor Checking Device

This checking device verifies either that an incremental tape stepping motor has in fact operated in response to a signal to write a tape character. The device consists of timing disk 10 fixed to motor shaft 11. This is also fixed to capstan 12 that drives magnetic tape 13. Motor 14, connected to shaft 11, is an incremental motor, but can be a continuous motor.

Disk 10 has a plurality of narrow slots 18 radially arranged uniformly. For example, if shaft 11 rotates 1.8 degrees per step,. disk 10 has 100 divisions, corresponding to a one inch capstan circumference for recording 200 characters per inch. Slots 18 are made through disk 10 to correspond to alternate characters being written on tape. Therefore, the slots have centers spaced 3.6 degrees, so that two motor steps are required to rotate disk 10 through the angle between any two slots.

Lamp 16 provides a right beam through one slot 18 at a time to photocell 17. Hence, photocell 17 is alternately lightened and darkened in response to alternate characters being written on tape. The alignment of photocell 17 with slots 18 causes it to be illuminated on even steps 2, 4, 6, etc., corresponding to even characters being written in a tape record. Hence, photocell 17 produces a pulsed output on even numbered characters through an amplifier 4 and lead 3.

In the circuit, binary trigger 2 maintains a count of the even numbered characters. Trigger 2 receives an input from a write character...