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Browse Prior Art Database

Distortion Free Tape Steering Mechanism

IP.com Disclosure Number: IPCOM000085605D
Original Publication Date: 1976-May-01
Included in the Prior Art Database: 2005-Mar-02
Document File: 4 page(s) / 85K

Publishing Venue

IBM

Related People

Guzman, AM: AUTHOR

Abstract

The device as depicted herein shows a helically scan magnetic tape transport, wherein tape skew is corrected without tape bending or other distortions.

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 54% of the total text.

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Distortion Free Tape Steering Mechanism

The device as depicted herein shows a helically scan magnetic tape transport, wherein tape skew is corrected without tape bending or other distortions.

As shown in Fig. 1, in order to correct skew in a tape transport system without distorting the tape 10, the moving of a connecting mechanism must maintain a straight line path. As shown in Fig. 1, a linearized version of a helically wrapped tape path is shown. In order to correct skew in the data track of tape 10, passive bearing 12 and active bearing 14 are positioned to engage tape 10 and move or position the tape 10 to eliminate skew.

For proper correction, passive bearing 12 must have a rotational degree of freedom. Likewise, active bearing 14 must have both rotational and displacement degrees of freedom. In order to correct skew without distortion, the straight line comprising of points A, B, C and D must be maintained as passive bearing 12 and active bearing 14 move about their respective pivot points.

Referring to Fig. 2, a side view of the tape transport is shown. Tape 10 exits cartridge 16, wraps about passive bearing 12, enters mandrel 18 at point 20, wraps helically about the mandrel 18 and exits mandrel 18 at point 22. Tape 10 then wraps active bearing 14 and exits active bearing 14 at point 24 to be taken up by capstan 26. In order to correct a skew error, an error signal is outputted from the control section of the tape transport, not shown. This signal activates the control mechanism of active bearing 14, thereby imparting rotational and translational motion to the bearing.

Fig. 4 and Fig. 5 depicts the design of an active D bearing herein after called the active bearing 14. Fig. 4b shows a top view of Fig. 1 over the active bearing line, CD represents the edge of the tape. That section of the tape is being pivoted about the axis; points C and D having radii R(C) and R(D), respecti...