US4253125A — Head loading and unloading mechanism for magnetic…

Claim 1

Independent Claim 127 words

The method of loading and unloading read/write heads with respect to a double-sided, magnetic, flexible and rotating disk, the improvement comprising the steps of: (a) applying unequal spring forces against said respective heads; (b) fixing the head to which the lesser spring force is applied against one side of the disk when in a loaded condition; and (c) allowing the head to which the greater spring force is applied to contact a second side of the disk when in a loaded condition; (d) loading said heads onto said disk with a periodic motion; (e) simultaneously withdrawing both said heads from said disk when unloading said heads from said disk; (f) said periodic motion causing said heads to be loaded onto said recording disk with substantially zero velocity.

Claim 2

Independent Claim 127 words

The method of loading and unloading read/write heads with respect to a double-sided, magnetic, flexible and rotating disk, the improvement comprising the steps of: (a) applying unequal spring forces against said respective heads; (b) fixing the head to which the lesser spring force is applied against one side of the disk when in a loaded condition; and (c) allowing the head to which the greater spring force is applied to contact a second side of the disk when in a loaded condition; (d) loading said heads onto said disk with a periodic motion; (e) simultaneously withdrawing both said heads from said disk when unloading said heads from said disk; (f) said periodic motion causing said heads to be loaded onto said recording disk with substantially zero velocity.

Claim 3

Dependent Claim 105 words

A loading mechanism for positioning read/write heads with respect to a double-sided, magnetic, rotating, flexible recording medium comprising: (a) first and second magnetic heads, for recording, or alternatively reading information on said medium; (b) first and second load springs wherein a respective spring is attached to a different one of said magnetic heads, (c) abutment means, (d) each said load spring having a different spring force to differentially bias the heads against said medium in a direction wherein the load spring with the lesser force contacts the abutment means, said differential spring force and abutment means maintaining said medium in its normal plane of rotation.

Claim 4

Dependent Claim 105 words

A loading mechanism for positioning read/write heads with respect to a double-sided, magnetic, rotating, flexible recording medium comprising: (a) first and second magnetic heads, for recording, or alternatively reading information on said medium; (b) first and second load springs wherein a respective spring is attached to a different one of said magnetic heads, (c) abutment means, (d) each said load spring having a different spring force to differentially bias the heads against said medium in a direction wherein the load spring with the lesser force contacts the abutment means, said differential spring force and abutment means maintaining said medium in its normal plane of rotation.

Claim 5

Dependent Claim 23 words

The loading mechanism in accordance with claim 2 wherein said abutment means is adjustable for changing the plane of rotation of said disk.

Claim 6

Dependent Claim 188 words

A moveable read-write head arrangement for a rotating, flexible multiple disk file system, comprising: (a) a pair of juxtaposed deflector blades fixed relative to each other and having a gap therebetween for receiving a rotating disk of said file system in said gap; (b) a pair of read/write heads positioned on either side of said gap; (c) a support arm radially aligned with the gap; (d) an abutment means; (e) a pair of flexure springs on the support arm, a different one of said heads being attached to a respective flexure spring; (f) a pair of head load springs on said support arm wherein a different load spring is attached to a different one of said heads and each said load spring having a different spring force to differentially bias said heads against said disk such that the lesser force spring contacts the abutment means; (g) loading-unloading means including a lever mounted on said support arm engageable with said load spring for retracting said heads and for engaging said read/write heads with said disk whereby said abutment means and said differential bias maintain said disk within said slot.

Claim 7

Dependent Claim 188 words

A moveable read-write head arrangement for a rotating, flexible multiple disk file system, comprising: (a) a pair of juxtaposed deflector blades fixed relative to each other and having a gap therebetween for receiving a rotating disk of said file system in said gap; (b) a pair of read/write heads positioned on either side of said gap; (c) a support arm radially aligned with the gap; (d) an abutment means; (e) a pair of flexure springs on the support arm, a different one of said heads being attached to a respective flexure spring; (f) a pair of head load springs on said support arm wherein a different load spring is attached to a different one of said heads and each said load spring having a different spring force to differentially bias said heads against said disk such that the lesser force spring contacts the abutment means; (g) loading-unloading means including a lever mounted on said support arm engageable with said load spring for retracting said heads and for engaging said read/write heads with said disk whereby said abutment means and said differential bias maintain said disk within said slot.

Claim 8

Dependent Claim 27 words

The moveable read-write head in accordance with claim 4 wherein said abutment means is adjustable for changing the plane of rotation of the disk within said slot.

Claim 9

Dependent Claim 55 words

The moveable read/write head arrangement in accordance with claim 4 wherein said loading and unloading means further includes, (a) a cam means for engaging said levers to position said heads against said disk in the loading portion, and (b) for disengaging said levers to position said heads away from said disk in the unloading position.

Claim 10

Dependent Claim 16 words

The moveable read/write head arrangement in accordance with claim 4 wherein said cam means is adjustable.

Claim 11

Dependent Claim 71 words

The moveable read/write head arrangement in accordance with claim 4 wherein said cam means is actuated to the loading-unloading position by a rotary solenoid means, said solenoid means in the energized condition causing said cam means to engage said levers to load said heads onto said disk, and said solenoid means in the unenergized condition causing said cam means to disengage from said levers to unload said heads from said disk.

Claim 12

Dependent Claim 31 words

The moveable read/write head arrangement in accordance with claim 4 wherein means are positioned in the vicinity of said gap for stabilizing said disk when said heads perform a read/write operation.

Claim 13

Independent Claim 161 words

A device for positioning read/write heads with respect to a double-sided, magnetic, rotating, flexible recording medium comprising: (a) first and second magnetic heads for alternatively reading and recording information on said medium; (b) first spring means coupled to said first magnetic head for allowing said first head to positively contact a surface of the recording medium; (c) second spring means coupled to said second magnetic head for allowing said second head to positively contact an opposite surface of the recording medium; (d) said second spring having a greater spring force than said first spring; (e) an adjustable stop means coupled to said first head; (f) means having a periodic motion for loading said heads onto the surfaces of the recording medium, such that said second head is urged against said first head until said stop means prevents said first head from moving further, said periodic motion means causing said heads to be loaded onto said recording medium with substantially zero velocity.

Claim 14

Independent Claim 161 words

A device for positioning read/write heads with respect to a double-sided, magnetic, rotating, flexible recording medium comprising: (a) first and second magnetic heads for alternatively reading and recording information on said medium; (b) first spring means coupled to said first magnetic head for allowing said first head to positively contact a surface of the recording medium; (c) second spring means coupled to said second magnetic head for allowing said second head to positively contact an opposite surface of the recording medium; (d) said second spring having a greater spring force than said first spring; (e) an adjustable stop means coupled to said first head; (f) means having a periodic motion for loading said heads onto the surfaces of the recording medium, such that said second head is urged against said first head until said stop means prevents said first head from moving further, said periodic motion means causing said heads to be loaded onto said recording medium with substantially zero velocity.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1984-02-24	1984-08-25	1985-02-24	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1988-02-24	1988-08-25	1989-02-24	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1992-02-24	1992-08-25	1993-02-24	$7700.00	Window Closed / Lapsed

Head loading and unloading mechanism for magnetic flexible disk

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