Browse Prior Art Database

Magnetic Disk Cartridge

IP.com Disclosure Number: IPCOM000085313D
Original Publication Date: 1976-Mar-01
Included in the Prior Art Database: 2005-Mar-02
Document File: 3 page(s) / 72K

Publishing Venue

IBM

Related People

Kellogg, RD: AUTHOR [+3]

Abstract

Cartridge 10 is formed of two identical halves 12 and 14 and has a magnetic disk 16 rotatably mounted therein by a pin 18. Cartridge 10 is made of relatively flexible material and is provided with opposite hinges 20 and 22 which allow cartridge ends 12a and 14a to be spread apart similarly to a clam shell, so that a magnetic read/write head 24 may be effective on disk 16.

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Magnetic Disk Cartridge

Cartridge 10 is formed of two identical halves 12 and 14 and has a magnetic disk 16 rotatably mounted therein by a pin 18. Cartridge 10 is made of relatively flexible material and is provided with opposite hinges 20 and 22 which allow cartridge ends 12a and 14a to be spread apart similarly to a clam shell, so that a magnetic read/write head 24 may be effective on disk 16.

The cartridge halves 12 and 14 may, for example, be formed of polypropylene which allows the integral molding of hinges 20 and 22; and the cartridge halves may be fastened together by ultrasonic welding, snap-fit, staking or other suitable means. Internal slots 25 are provided in halves 12 and 14 to allow hinges 20 and 22 to lie on the center line of pin 18.

Halves 12 and 14 are provided with closures 26 which may be of VELCRO*, such as disclosed in U. S. Patent 3,748,701, for example, to insure that cartridge 10 remains closed until ends 12a and 14a are spread apart. A labyrinth seal 28 is molded in halves 12 and 14 and comprises ribs 30 received in slots 32 interacting in the closed position of ends 12a and 14a to form a dust-tight seal.

In operation, cartridge 10 is inserted into a slot 34 provided at one end with a wedge 36, and at the other end with pinch rollers 38 and 40 acted on by springs 42 and 44. Upon insertion of cartridge 10 into slot 34, wedge 36 forces the ends 12a and 14a apart, exposing disk 16 to the head 24 for magnetically reading or writing on disk 16. Head 24 may be mounted on a linear actuator, not shown, to cause head 24 to traverse across disk 16. Disk 16 may be rotatably driven about pin 18 by opposed pinch rolls 46 and 48 gripping the edge of disk 16, or by a capstan 5O driving the rim of disk 16 directly. Upon removal of cartridge 10 from slot 34, pinch rollers 38 and 40 act as strippers, forcing the two cartridge ends 12a and 14a together and causing closures 26 to seal cartridge 10.

Cartrid...