US3918090A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Switching arrangement for the automatic detection of a recordable point on a moving recording carrier
Assignee: Siemens AG
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Filing: 1974-12-18
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Granted: 1975-11-04
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Expires: 1994-12-18
Abstract
Abstract A switching arrangement for automatically detecting a recordable point on a moving recording carrier includes a control circuit which is supplied with a first signal for causing detection of the recordable point and with reading pulses produced by data stored on the recording carrier to cause movement of the carrier in the forward direction after the occurrence of the first signal, while at the same time monitoring the occurrence of reading pulses. The control circuit further causes a movement of the carrier in the reverse direction when reading pulses do not occur after a predetermined interval, and causes movement of the carrier in the forward direction after a renewed occurrence of reading pulses. The control circuit provides a second signal which indicates the readiness for writing new data when the recording carrier is moved in the forward direction to such an extent that a predetermined distance is maintained between the data stored last and the data to be newly recorded.
Inventors
- 👤 Martin Ludwig
- 👤 Rudolf Queisser
- 👤 Hubert Schlossbauer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:15
CPC Classifications
G; G11; G11B; G11B20/00; G11B20/10; G11B20/12; G11B20/1201; G11B20/1202; G11B20/1205; G11B2020/10916
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
234 words
A switching arrangement for automatically detecting an information-free recordable location on a moving recording carrier which has spaced information blocks recorded thereon, a carrier drive mechanism operable to selectively move the carrier in forward and reverse directions and a reading device operable to produce reading pulses in response to the movement of information stored on the carrier past the reading device, said arrangement comprising: first means connected to the carrier drive mechanism to control the direction of carrier movement and operable in response to receipt of a search signal to cause movement of the carrier in the forward direction; second means connected to the reading device and to said first means and operable after a predetermined interval from a last reading pulse of an information block to cause said first means to reverse the operation of the drive mechanism, and operable in response to renewed detection of reading pulses with the carrier moving in the reverse direction to again cause said first means to reverse operation of the drive mechanism to move the carrier in the forward direction; and third means connected to the reading device and to said first means and operable after a second predetermined interval after the renewed movement of the carrier in the forward direction to provide a readiness signal to indicate an information-free recordable location and to cause said first means to stop the operation of the drive mechanism.
Claim 2
Dependent Claim
234 words
A switching arrangement for automatically detecting an information-free recordable location on a moving recording carrier which has spaced information blocks recorded thereon, a carrier drive mechanism operable to selectively move the carrier in forward and reverse directions and a reading device operable to produce reading pulses in response to the movement of information stored on the carrier past the reading device, said arrangement comprising: first means connected to the carrier drive mechanism to control the direction of carrier movement and operable in response to receipt of a search signal to cause movement of the carrier in the forward direction; second means connected to the reading device and to said first means and operable after a predetermined interval from a last reading pulse of an information block to cause said first means to reverse the operation of the drive mechanism, and operable in response to renewed detection of reading pulses with the carrier moving in the reverse direction to again cause said first means to reverse operation of the drive mechanism to move the carrier in the forward direction; and third means connected to the reading device and to said first means and operable after a second predetermined interval after the renewed movement of the carrier in the forward direction to provide a readiness signal to indicate an information-free recordable location and to cause said first means to stop the operation of the drive mechanism.
Claim 3
Dependent Claim
16 words
A switching arrangement according to claim 1, wherein said recording carrier comprises a magnetic recording tape.
Claim 4
Dependent Claim
107 words
A switching arrangement according to claim 1, wherein said first means comprises: a first flip-flop connected to the drive mechanism and connected to receive and be set by the search signal; and a second flip-flop connected to receive and be set by the search signal and connected to the drive mechanism for causing the carrier to move in the forward direction; and said second means comprises a first time delay circuit connected to receive the search signal and to the reading device to reset said second flip-flop to cause movement of the carrier in the reverse direction when reading pulses are not received for a predetermined interval.
Claim 5
Dependent Claim
46 words
A switching arrangement according to claim 3, comprising a third time delay circuit connected to receive the search signal and connected to set said second flip-flop and initiate operation of said first time delay element at a time delayed from the setting of said first flip-flop.
Claim 6
Dependent Claim
90 words
A switching arrangement according to claim 3, wherein said first means further comprises means connected to the reading device and connected to set said second flip-flop in response to detection of stored information as the carrier moves in the reverse direction to cause the carrier to again move in the forward direction, and a second timE delay circuit connected to the last-mentioned means and to said first flip-flop to reset said first flip-flop after a predetermined interval of travel of the carrier in the forward direction to stop the carrier.
Claim 7
Dependent Claim
27 words
A switching arrangement according to claim 5, wherein said second time delay circuit includes an output which provides the readiness signal upon resetting of said first flip-flop.
Claim 8
Dependent Claim
37 words
A switching arrangement according to claim 5, wherein said second time delay circuit has a time delay to provide a predetermined interval on the carrier between the last stored information block and the information to be stored.
Claim 9
Dependent Claim
51 words
A switching arrangement according to claim 5, wherein said third means comprises gating means having an input connected to the reading device, an input connected to an output of said second flip-flop, and an output connected to the reset input of said second flip-flop and to said second time delay circuit.
Claim 10
Dependent Claim
73 words
A switching arrangement according to claim 5, wherein said first and second timing circuits comprise respective counters, and further comprising a timing disc bearing periodic timing marks, said disc mounted for rotation by the carrier drive mechanism; and a scanning device connected to said counters and responsive to the timing marks to provide counting pulses and provide a definite association between the position of the carrier and the state of the switching arrangement.
Claim 11
Dependent Claim
44 words
A switching arrangement according to claim 5, wherein said first and second timing circuits comprise respective counters; and further comprising means for providing counting pulses to said counters in accordance with carrier movement to provide the respective time delays upon reaching respective predetermined counts.
Claim 12
Independent Claim
147 words
A method of automatically detecting an information-free recordable location on a recording carrier which has spaced apart information blocks recorded thereon and which may be moved in forward and reverse directions, comprising the steps of: moving the carrier in the forward direction while simultaneously reading information stored on the carrier by generating reading pulses in response to detection of such information; reversing the direction of the carrier when reading pulses are no longer detected for a predetermined interval; searching for information stored by generating and sensing reading pulses with the carrier moving in the reverse direction; reversing movement of the carrier to the forward direction in response to sensing of reading pulses in the reverse direction; moving the carrier in the forward direction for a predetermined time interval corresponding to the desired spacing between blocks of information; and stopping the carrier upon reaching the predetermined time interval.
Claim 13
Independent Claim
147 words
A method of automatically detecting an information-free recordable location on a recording carrier which has spaced apart information blocks recorded thereon and which may be moved in forward and reverse directions, comprising the steps of: moving the carrier in the forward direction while simultaneously reading information stored on the carrier by generating reading pulses in response to detection of such information; reversing the direction of the carrier when reading pulses are no longer detected for a predetermined interval; searching for information stored by generating and sensing reading pulses with the carrier moving in the reverse direction; reversing movement of the carrier to the forward direction in response to sensing of reading pulses in the reverse direction; moving the carrier in the forward direction for a predetermined time interval corresponding to the desired spacing between blocks of information; and stopping the carrier upon reaching the predetermined time interval.
Claim 14
Dependent Claim
32 words
The method of claim 11, wherein the step of moving the carrier are further defined as moving the carrier at a speed which is greater than the normal writing and reading speed.
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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) | 1978-11-03 | 1979-05-05 | 1979-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-03 | 1983-05-05 | 1983-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-03 | 1987-05-05 | 1987-11-04 | $7700.00 | Window Closed / Lapsed |