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Hot Wire Cutter for Flexible Recording Media

IP.com Disclosure Number: IPCOM000045327D
Original Publication Date: 1983-Mar-01
Included in the Prior Art Database: 2005-Feb-06
Document File: 2 page(s) / 38K

Publishing Venue

IBM

Related People

Burr, P: AUTHOR [+2]

Abstract

When flexible recording media such as floppy disks or tapes are cut from a continuous web by a knife or punch, debris is produced which may settle on the recording surface and cause subsequent errors. Presently, this problem is avoided by using a powerful laser to cut the discs.

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Hot Wire Cutter for Flexible Recording Media

When flexible recording media such as floppy disks or tapes are cut from a continuous web by a knife or punch, debris is produced which may settle on the recording surface and cause subsequent errors. Presently, this problem is avoided by using a powerful laser to cut the discs.

A low cost method of overcoming this problem is to use a hot wire to burn through the material in much the same way as with a laser. However, with a stationary heated wire the cutting speed is limited by local cooling of the wire by the medium being cut. This is avoided by moving the wire continuously perpendicular to the medium like a bandsaw, so that as the wire is cooled by the cutting process, it moves on to be replaced by wire still at the cutting temperature.

The cutting apparatus is shown schematically in the figure. The web of flexible material to be cut by a hot wire is supported on a flat bed 2 between a supply roller 3 and a take-up roller 4. A motor (not shown) is provided in order to drive the web backwards and forwards over the bed 2 during the cutting operation, as indicated by the double-headed arrow 5, and to advance new material onto the bed following completion of each cutting operation. The bed 2 is formed in two parts separated by a gap 6 transverse to the feed direction of the web to give access across the web to the hot wire cutter.

The cutter consists of a frame 7 carrying four insulating pulleys 8 on which is supported a contin...