Browse Prior Art Database

Eddy Current Decelerator

IP.com Disclosure Number: IPCOM000083171D
Original Publication Date: 1975-Apr-01
Included in the Prior Art Database: 2005-Mar-01
Document File: 2 page(s) / 35K

Publishing Venue

IBM

Related People

Perrucci, JS: AUTHOR [+2]

Abstract

A printed-circuit motor is used to rotate a print element for printing on documents in motion. The requirement is to print on documents which are moving at a high velocity. The print element is required to accelerate to maximum velocity in a time t1, while traveling through an angle A. It then maintains constant velocity through an angle B for time t2 as the electrical energy is removed. During constant velocity, printing takes place. The element is then required to decelerate in a time t3, while traveling through an angle C. The present arrangement with the eddy-current decelerator essentially reduces the energy requirement by half.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 59% of the total text.

Page 1 of 2

Eddy Current Decelerator

A printed-circuit motor is used to rotate a print element for printing on documents in motion. The requirement is to print on documents which are moving at a high velocity. The print element is required to accelerate to maximum velocity in a time t1, while traveling through an angle A. It then maintains constant velocity through an angle B for time t2 as the electrical energy is removed. During constant velocity, printing takes place. The element is then required to decelerate in a time t3, while traveling through an angle C. The present arrangement with the eddy-current decelerator essentially reduces the energy requirement by half.

The motor 1, printing element 3, aluminum brake sector 5 and permanent magnets 7 are illustrated in Fig. 1. The aluminum sector 5 and permanent magnets 7 are further illustrated in Fig. 2, showing the relationship of the parts and a document at various times during an operating cycle.

When it is desired to print on a high-speed moving document, accelerating energy is applied to the printed circuit motor 1. The print element 3 then moves through angle A in time t1, until it achieves essentially the same velocity as the moving document. The accelerating energy is then removed and the print element 3 maintains this velocity through angle B for time t2, during which time printing occurs. After printing, the device is decelerated by application of deceleration energy through an angle C in a time t3, which opposes...