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Browse Prior Art Database

Web Steering Method and Apparatus

IP.com Disclosure Number: IPCOM000076177D
Original Publication Date: 1972-Jan-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 2 page(s) / 44K

Publishing Venue

IBM

Related People

Herron, TF: AUTHOR [+2]

Abstract

A web can be steered, without wrapping around a roll, for "tensionless" applications such as those where the web is of fragile material or is coated or printed on a side that cannot contact a roll until dry.

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Web Steering Method and Apparatus

A web can be steered, without wrapping around a roll, for "tensionless" applications such as those where the web is of fragile material or is coated or printed on a side that cannot contact a roll until dry.

Two web steering units 1 (Fig. 1) are supported on respective pivot pins 2 and normally oriented at similar slight angles to a line extending transversely of the feed path of web 3. This web moves between side edge guides 4. Suitable elements 5, such as air jets, provide corrective signals to a servo system (not shown) to cause the units 1 to pivot, as necessary, to restore web 3 to its predetermined path between the guides as and when it tends to wander from the path. Knobs 6 are manually adjustable to position air jets 5 far enough apart, in relation to the width of the particular web 3, to keep the web taut between the guides without wrinkling.

Each unit 1 comprises a stationary generally V-shaped baffle 7, the included volume of which is connected to vacuum source 8 via hollow shaft 9. Baffle 7 is inserted with a slight radial clearance within a rotating porous roll 10 so suction is applied to web 3 only in the area, above the baffle, where the web is gripped by the roll to apply the steering correction during pivoting of unit 1 (and hence the roll) on pin 2. Blades 11 extend transversely adjacent the leading and trailing sides of roll 10, to support web 3 and prevent it from wrapping around and tending to follow the roll...