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Magnetic read heads are subject to excessive wear when employed in harsh environments. The arrangement shown above alleviates such wear problems.
English (United States)
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100% of the total text.
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Magnetic Read Head Protector
Magnetic read heads are subject to excessive wear when employed in harsh
environments. The arrangement shown above alleviates such wear problems.
A thin tape of nonmagnetic wear-resilient material, such as
MYLAR*, is arranged to be drawn over the read element, as shown in
Fig. 1. The tape is supplied from a supply spool 1, mounted on the
magnetic wand 3, and guided over the read element 5 by a guide 7.
The used part of the tape 9 is taken up by a take-up spool 11,
also mounted on the wand 3. Fig. 2 is a bottom view showing the
relationship between the guide 7, the read element 5, and the movable
wear tape 9. Fig. 3 shows the details of roller 1, which is mounted
for rotation in a bracket 13, and is compressed by a spring 14
against a brake pad 15 to prevent unwanted rotation. Roller 11 (Fig.
1) has a similar mounting.
As an area of the tape covering the element 5 wears, the worn spot is moved
away and a fresh area supplied by finger-tip rotation of the take-up reel 11.
When the complete tape is worn, it is replaced. This results in a long life
magnetic read head, as the wear is against the tape rather than the read head. *
Trademark of E. I. du Pont de Nemours & Co.
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