US4740732A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Adaptive rewind for tape drive
Assignee: HP Inc
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Filing: 1986-09-03
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Granted: 1988-04-26
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Expires: 2006-09-03
Abstract
Abstract An adaptive rewind system is described for use in tape drive apparatus or other apparatus involving roll goods which are movable between a supply reel and a take-up reel. The system includes (1) comparison means for (a) comparing the voltage at the motor driving the supply reel to a supply reference voltage, and (b) comparing the voltage at the motor driving the take-up reel to the supply reference voltage, and (2) control means adapted to maximize the velocity of the roll goods while being wound from one reel to the other. The control means is adapted to drive at least one of the motors with a voltage essentially equal to the supply reference voltage, while the voltage at the other motor does not exceed the supply reference voltage.
Inventors
- 👤 Peter Way
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:32
CPC Classifications
G; G11; G11B; G11B15/00; G11B15/18; G11B15/46; G11B15/54; H; H02; H02P; H02P5/00; H02P5/46; H02P5/50
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
143 words
A tape drive apparatus of the type having a supply reel for magnetic tape driven by a first electrical motor and a take-up reel driven by a second electrical motor, wherein a motor voltage supply is available to drive said electrical motors, the improvement comprising: (a) comparison means adapted to compare the voltage at said first motor to a supply reference voltage, and further adapted to compare the voltage at said second motor to said supply reference voltage; and (b) control means responsive to the comparison means and adapted to maximize the velocity of said tape while being wound from one said reel to the other said reel by driving at least one of said electrical motors with a voltage essentially equal to said supply reference voltage; wherein the voltage at the other said electrical motor does not exceed said supply reference voltage.
Claim 2
Dependent Claim
143 words
A tape drive apparatus of the type having a supply reel for magnetic tape driven by a first electrical motor and a take-up reel driven by a second electrical motor, wherein a motor voltage supply is available to drive said electrical motors, the improvement comprising: (a) comparison means adapted to compare the voltage at said first motor to a supply reference voltage, and further adapted to compare the voltage at said second motor to said supply reference voltage; and (b) control means responsive to the comparison means and adapted to maximize the velocity of said tape while being wound from one said reel to the other said reel by driving at least one of said electrical motors with a voltage essentially equal to said supply reference voltage; wherein the voltage at the other said electrical motor does not exceed said supply reference voltage.
Claim 3
Dependent Claim
23 words
Tape drive apparatus in accordance with claim 1, wherein said voltages at said first and second electrical motors are monitored by analog-to-digital converters.
Claim 4
Dependent Claim
40 words
Tape drive apparatus in accordance with claim 2, wherein said control means comprises a processor operative for generating a velocity command which is adapted to adjust said voltage at said first and second motors in response to said comparison means.
Claim 5
Dependent Claim
37 words
Tape drive apparatus in accordance with claim 3, wherein said processor is adapted to increase said velocity command when the voltage at each of said first and second electrical motors is less than said supply reference voltage.
Claim 6
Dependent Claim
32 words
Tape driven apparatus in accordance with claim 3, wherein said processor is adapted to decrease said velocity command when the voltage at either of said electrical motors exceeds said supply reference voltage.
Claim 7
Dependent Claim
143 words
In drive apparatus of the type having a supply reel for roll goods driven by a first electrical motor and a take-up reel driven by a second electrical motor, wherein a motor voltage supply is available to drive said electrical motors, the improvement comprising: (a) comparison means adapted to compare the voltage at said first motor to a supply reference voltage, and further adapted to compare the voltage at said second motor to said supply reference voltage; and (b) control means responsive to the comparison means and adapted to maximize the velocity of said roll goods while being wound from one said reel to the other said reel by driving at least one of said electrical motors with a voltage essentially equal to said supply reference voltage; wherein the voltage at the other said electrical motor does not exceed said supply reference voltage.
Claim 8
Dependent Claim
143 words
In drive apparatus of the type having a supply reel for roll goods driven by a first electrical motor and a take-up reel driven by a second electrical motor, wherein a motor voltage supply is available to drive said electrical motors, the improvement comprising: (a) comparison means adapted to compare the voltage at said first motor to a supply reference voltage, and further adapted to compare the voltage at said second motor to said supply reference voltage; and (b) control means responsive to the comparison means and adapted to maximize the velocity of said roll goods while being wound from one said reel to the other said reel by driving at least one of said electrical motors with a voltage essentially equal to said supply reference voltage; wherein the voltage at the other said electrical motor does not exceed said supply reference voltage.
Claim 9
Dependent Claim
22 words
Drive apparatus in accordance with claim 6, wherein said voltages at said first and seocnd electrical motors are monitored by analog-to-digital converters.
Claim 10
Dependent Claim
14 words
Drive apparatus in accordance with claim 6, wherein said roll goods comprise a filament.
Claim 11
Dependent Claim
14 words
Drive apparatus in accordance with claim 6, wherein said roll goods comprise a web.
Claim 12
Dependent Claim
39 words
Drive apparatus in accordance with claim 7, wherein said control means comprises a processor operative for generating a velocity command which is adapted to adjust said voltage at said frist and second motors in response to said comparison means.
Claim 13
Dependent Claim
36 words
Drive apparatus in accordance with claim 10, wherein said processor is adapted to increase sad velocity command when the voltage at both of said first and second electrical motors is less than said supply reference voltage.
Claim 14
Dependent Claim
31 words
Drive apparatus in accordance with claim 10, wherein said processor is adapted to decrease said velocity command when the voltage at either of said electrical motors exceeds said supply reference voltage.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-04-26 | 1991-10-26 | 1992-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-04-26 | 1995-10-26 | 1996-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-04-26 | 1999-10-26 | 2000-04-26 | $7700.00 | Window Closed / Lapsed |