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Browse Prior Art Database

Torque Overload Protector

IP.com Disclosure Number: IPCOM000074198D
Original Publication Date: 1971-Mar-01
Included in the Prior Art Database: 2005-Feb-23
Document File: 2 page(s) / 52K

Publishing Venue

IBM

Related People

Martin, FW: AUTHOR [+3]

Abstract

The torque on the drive motor of the type cartridge in a high speed printer is measured by measuring the load angle of the motor.

This text was extracted from a PDF file.
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This is the abbreviated version, containing approximately 85% of the total text.

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Torque Overload Protector

The torque on the drive motor of the type cartridge in a high speed printer is measured by measuring the load angle of the motor.

A pulse disk 10 is shown at A mounted on the shaft of the synchronous drive motor for the cartridge having raised portions 10a and 10b corresponding to the acceptable load angle thereof which are sensed by a magnetic transducer 12. The positive output pulse P1 is used as shown at B to indicate the start of an acceptable time interval T or window, and the negative pulse P2 the termination. A certain point in line frequency will be used to establish a small reference pulse p, which must fall within one of the two intervals.

The transducer 12 is adjusted dynamically without load on the motor so that the end of the interval coincides with the reference pulse p.

The interval T is delayed with respect to the reference pulse p when torque is applied to the motor. Overload is indicated when the reference pulse p does not fall within the interval T.

At C are shown curves illustrating, respectively, No-Load, Load, and Overload conditions for the reference pulse p and the time interval T.

To compensate for the effect of voltage on the characteristics of the motor the interval length of T can be generated electronically from the line voltage using either (1) constant trigger point and variable interval length, or (2) variable trigger point and interval length.

At D are shown typical curves for a variable interval length g...