US3777245A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Closed loop stepping motor control for a tape reader
Assignee: Superior Electric Co
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Filing: 1972-06-23
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Granted: 1973-12-04
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Expires: 1992-06-23
Abstract
Abstract A tape reader having a reading station past which tape having transverse rows of holes is moved by a drive system that includes a stepping motor with the system, after a stop command, inhibiting further reading while continuing to move the tape a plurality of rows and then reversing the tape movement for only the extent that it continued moving after the stop command thereby enabling the system to move the tape at a faster rate than if the system was required to have the ability to stop immediately at any one of the rows.
Inventors
- 👤 J May
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:10
CPC Classifications
G; G11; G11B; G11B15/00; G11B15/18; G11B15/20; G05; G05B; G05B19/00; G05B19/02; G05B19/18; G05B19/408; G06; G06K; G06K13/00; G06K13/18; G06K13/20; G05B2219/00; G05B2219/30; G05B2219/41; G05B2219/41326; G05B2219/42; G05B2219/42213
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
119 words
A tape reader comprising a reading station at which means are provided for produCing electrical representation of information longitudinally disposed on tape, and means for moving the tape longitudinally past the station, said moving means including means for initiating and continuing movement of the tape upon a start command, means for receiving a stop command and preventing further representations from appearing while the tape is continued to be moved past the reading station after the stop command and means for longitudinally moving the tape in the reverse direction to locate the start of the tape whose electrical representations were prevented from appearing in position at the reading station to produce electrical representation upon receipt of the next start command.
Claim 2
Dependent Claim
119 words
A tape reader comprising a reading station at which means are provided for produCing electrical representation of information longitudinally disposed on tape, and means for moving the tape longitudinally past the station, said moving means including means for initiating and continuing movement of the tape upon a start command, means for receiving a stop command and preventing further representations from appearing while the tape is continued to be moved past the reading station after the stop command and means for longitudinally moving the tape in the reverse direction to locate the start of the tape whose electrical representations were prevented from appearing in position at the reading station to produce electrical representation upon receipt of the next start command.
Claim 3
Dependent Claim
44 words
The invention as defined in claim 1 in which there are means for measuring the extent of continued movement of the tape after the receipt of the stop command and means for measuring the extent of movement of the tape in the reverse direction.
Claim 4
Dependent Claim
57 words
The invention as defined in claim 2 in which the measuring means includes means for providing a digital signal for each longitudinal increment of tape moved, counter means for adding the increments of tape continued movement and subtracting the increments of tape reversal movement and means for stopping tape movement upon a selected count of the counter.
Claim 5
Dependent Claim
80 words
The invention as defined in claim 3 in which the tape is provided with equally spaced transverse rows of the holes, in which there is at least one increment between rows and in which the selected count of the counter means for operating the stopping means is equal to the number of increments between rows, whereby the first row that is prevented from having its electrical representation appear is positioned at the reading station when the tape is completely stopped.
Claim 6
Dependent Claim
34 words
The invention as defined in claim 4 in which there are means for immediately causing the electrical representation of the row at the reading station to appear upon receipt of the next start command.
Claim 7
Dependent Claim
58 words
The invention as defined in claim 1 in which the moving means includes a sprocket connected to a reversible electric motor, in which there are means for accelerating the motor over a plurality of representations upon receipt of a start command and means for decelerating the motor over a plurality of representations upon receipt of a stop command.
Claim 8
Dependent Claim
42 words
The invention as defined in claim 6 in which the tape moving means includes means for stopping the motor when it is decelerated to a selected speed and means for maintaining the motor stopped for a selected interval before initiating reverse movement.
Claim 9
Dependent Claim
36 words
The invention as defined in claim 7 in which the reverse movement is at an essentially constant speed that approximates the speed at which the motor is decelerated to a stop state prior to its reversal.
Claim 10
Dependent Claim
36 words
The invention as defined in claim 1 in which there are means for delaying the initiating of movement upon receipt of a next start command for a selected time after the terminating of prior tape movement.
Claim 11
Dependent Claim
62 words
The invention as defined in claim 1 in which the tape is provided with equally spaced transverse rows of holes, in which the motor is a stepping motor providing a step for each change of energization thereto and in which there are a plurality of steps required to move from one row of holes at the reading station to the next row.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-03 | 1977-06-04 | 1977-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-03 | 1981-06-04 | 1981-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-03 | 1985-06-04 | 1985-12-04 | $7700.00 | Window Closed / Lapsed |