Browse Prior Art Database

Single Axis Pivot Block

IP.com Disclosure Number: IPCOM000035638D
Original Publication Date: 1989-Jul-01
Included in the Prior Art Database: 2005-Jan-28
Document File: 3 page(s) / 101K

Publishing Venue

IBM

Related People

Clancy, DE: AUTHOR [+2]

Abstract

In band tracking, it is known to tilt the drive and idler pulleys in the side-to-side direction in order to keep the print band registered against the pulley flanges (see Fig. 1). Usually, the drive pulley has a built-in tilt, while the pivot block used to support the idler pulley has an adjustable eccentric nut on its support shaft that is rotated until the proper tile required for band tracking is obtained. The disadvantage with this simple eccentric adjustment is that any side- to-side tile also produces a slight amount of undesirable front-to-back tilt. This article describes an improvement to this device that eliminates this undesirable front-to-back tilt.

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Single Axis Pivot Block

In band tracking, it is known to tilt the drive and idler pulleys in the side-to- side direction in order to keep the print band registered against the pulley flanges (see Fig. 1). Usually, the drive pulley has a built-in tilt, while the pivot block used to support the idler pulley has an adjustable eccentric nut on its support shaft that is rotated until the proper tile required for band tracking is obtained. The disadvantage with this simple eccentric adjustment is that any side- to-side tile also produces a slight amount of undesirable front-to-back tilt. This article describes an improvement to this device that eliminates this undesirable front-to- back tilt.

Fig. 2 shows schematically the invention in which rotation of the pivot block eccentric nut limits pivot block tilt to the side-to-side direction only. The bottom slot in the top pivot arm has a width, D1,

(Image Omitted)

equal to the diameter of the pivot block support shaft. The counterbored upper slot in top pivot arm has a width, D2, equal to the outer diameter of the eccentric nut (whose hole diameter, D1, is eccentric to its outer diameter, D2). As the eccentric nut is rotated, the pivot block support shaft is forced to be displaced in the direction of the bottom slot, i.e., side-to-side. This limits the pivot block arm and thus the idler pulley, to have only side-to-side tilt.

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