US3855513A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Perforated-tape reader drive system
Assignee: Siemens AG
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Filing: 1973-04-10
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Granted: 1974-12-17
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Expires: 1993-04-10
Abstract
Abstract A control system for incrementally driving perforated-tape readers in which both a velocity control loop and a position control loop are provided. A speed-controllable motor is initially driven by a velocity signal until it has gone approximately one-half of a tape advance step at which point a position control signal having a specially derived shape is used to move the motor to its final desired position.
Inventors
- 👤 J Brunner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:31
CPC Classifications
G; G06; G06K; G06K13/00; G06K13/18; G06K13/20
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
107 words
A drive system for a perforated tape reader in which the tape is driven by a sprocket comprising: a. a speed controllable dc motor coupled to the sprocket; b. means to develop a position control signal; c. means to develop a velocity control signal; d. means to selectively couple one of said position and velocity control signals to said motor in response to an input level, said velocity signal being coupled in response to an input level above a predetermined value and said position signal in response to an input level below said predetermined level, and e. means to provide an input level to said coupling means.
Claim 2
Dependent Claim
107 words
A drive system for a perforated tape reader in which the tape is driven by a sprocket comprising: a. a speed controllable dc motor coupled to the sprocket; b. means to develop a position control signal; c. means to develop a velocity control signal; d. means to selectively couple one of said position and velocity control signals to said motor in response to an input level, said velocity signal being coupled in response to an input level above a predetermined value and said position signal in response to an input level below said predetermined level, and e. means to provide an input level to said coupling means.
Claim 3
Dependent Claim
41 words
The invention according to claim 1 wherein said means to develop a velocity control signal comprise a tachometer coupled to the shaft of said motor and means to sum said tachometer signal with said input level to develop an output signal.
Claim 4
Dependent Claim
51 words
The invention acccording to claim 2 wherein said position control means comprise function generation means coupled to the shaft of said motor and adapted to provide an output which is stable at each detent position of the sprocket and means to provide said signal through said coupling means to said motor.
Claim 5
Dependent Claim
78 words
The invention according to claim 3 wherein said function generation means comprise: a. means to generate signals proportional to sin (n Alpha /2) and -cos(n Alpha /2); and b. means to combine the signals sin(n Alpha Alpha /2and -cos(n Alpha /2) to develop a signal proportional to sin(n Alpha /2) times the sign of (-cos(n Alpha /2) where Alpha is the angular position of said sprocket and n is the number of steps per revolution of said sprocket.
Claim 6
Dependent Claim
108 words
The invention according to claim 4 and further including: a. means responsiVe to a set signal to provide a first level above said predetermined level as said input level and in response to a reset input a second level below said predetermined level as said input level; and b. means to provide a pulse output to said reset input each time the sign of (-cosine (n Alpha /2)changes, whereby by setting said means said motor will initially be driven through a velocity control loop and upon (-cos(n Alpha /2) crossing zero when the motor has moved one half step will then be switched to the position control loop.
Claim 7
Dependent Claim
45 words
The invention according to claim 4 wherein said means to generate comprises a magnetized disk having n/2 segments coupled to said sprocket and two fixed Hall effect generators placed to be influenced by said disk, said generators being displaced 90 electrical degrees from each other.
References Cited (Backward Citations)
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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) | 1977-12-16 | 1978-06-17 | 1978-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-16 | 1982-06-17 | 1982-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-16 | 1986-06-17 | 1986-12-17 | $7700.00 | Window Closed / Lapsed |