US3605111A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Trace-interrupting multichannel recorder
Assignee: Clevite Corp
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Filing: 1970-03-19
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Granted: 1971-09-14
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Expires: 1990-03-19
Abstract
Abstract A multichannel strip chart recorder has a commutator to sequentially sample signals at a plurality of channels and apply the samples to a single-pen recording device. A spring-biased actuator holds the pen off the chart during commutation. A solenoid overcomes the spring allowing the pen to record a dot for each signal sample. Thus, each signal is recorded as a trace made up of a series of dots. Trace-identifying symbols are preprinted sequentially and repetitively along an edge of the chart in predetermined relation to the chart sprocket holes. As each symbol moves into approximate alignment with the path of the recording pen tip the solenoid action is inhibited by signals from electro-optical devices sensing the positions of sprocket holes and notches at the edge of the chart so that the trace identified with that symbol is interrupted. When the signal at one channel has higher frequency content than the signals at other channels, the commutator sequence may be arranged to sample that signal more often than the signals at other channels.
Inventors
- 👤 Ronald H Schmoll
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:05
CPC Classifications
G; G01; G01D; G01D9/00; G01D9/02; G01D9/20; G01D9/24; G01D9/28; G01D9/32; G01D9/34
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
256 words
A chart recorder adapted to mark traces on a moving chart representing signals of varying magnitudes at each of a plurality of input circuits comprising: a. recording means having a chart-marking element, and means for moving said marking element along a recording line transverse to the direction of chart motion to positions representing the varying magnitude of a signal applied to said means; b. a commutator adapted to connect each input circuit to said recording means in predetermined sequence; c. trace control means adapted selectively to permit and to prevent marking on the chart by said marking element without interfering with movement of said marking element along said recording line; d. means for actuating said trace-control means to prevent marking during switching from one input circuit to another input circuit by said commutator, and to permit marking only during the time that the marking element is in the position representing the magnitude of the signal at the input circuit then connected by said commutator; e. a plurality of trace identifying symbols, a different one thereof identified with each of said input circuits, preprinted sequentially and repetitively along an edge of said chart; and f. trace-interrupting means, controlled, at least in part, by the chart during each time that one of said identifying symbols is in approximate alignment with said recording line, influencing the action of said trace control means to prevent marking of the trace of the signal from the input circuit identified with the symbol which is then in approximate alignment with said recOrding line.
Claim 2
Dependent Claim
256 words
A chart recorder adapted to mark traces on a moving chart representing signals of varying magnitudes at each of a plurality of input circuits comprising: a. recording means having a chart-marking element, and means for moving said marking element along a recording line transverse to the direction of chart motion to positions representing the varying magnitude of a signal applied to said means; b. a commutator adapted to connect each input circuit to said recording means in predetermined sequence; c. trace control means adapted selectively to permit and to prevent marking on the chart by said marking element without interfering with movement of said marking element along said recording line; d. means for actuating said trace-control means to prevent marking during switching from one input circuit to another input circuit by said commutator, and to permit marking only during the time that the marking element is in the position representing the magnitude of the signal at the input circuit then connected by said commutator; e. a plurality of trace identifying symbols, a different one thereof identified with each of said input circuits, preprinted sequentially and repetitively along an edge of said chart; and f. trace-interrupting means, controlled, at least in part, by the chart during each time that one of said identifying symbols is in approximate alignment with said recording line, influencing the action of said trace control means to prevent marking of the trace of the signal from the input circuit identified with the symbol which is then in approximate alignment with said recOrding line.
Claim 3
Dependent Claim
35 words
A chart recorder as described in claim 1 in which the sequence of connections of said input circuits by said commutator is such that one input circuit is connected more often than other input circuits.
Claim 4
Dependent Claim
55 words
A chart recorder as described in claim 1 in which the chart has cutout areas along an edge thereof at predetermined locations relative to the identifying symbols, and the trace-interrupting means include means for sensing each of said cutout areas as it moves into approximate alignment with a predetermined position relative to said recording line.
Claim 5
Dependent Claim
24 words
A chart recorder as described in claim 3 in which the means for sensing cutout areas comprise a light source and a light-sensitive device.
Claim 6
Dependent Claim
42 words
A chart recorder as described in claim 1 in which the traces are ink traces applied by a pen positioned by said recording means, and the trace-control means comprise means for moving the pen into and out of contact with the chart.
Claim 7
Dependent Claim
142 words
A chart recorder as described in claim 5 in which the chart is a strip chart having sprocket holes along an edge, the trace-identifying symbols are preprinted with spacing equal to the spacing of the sprocket holes, and there are N input circuits; and in which the trace-interrupting means comprise: the said sprocket holes, a notch in the edge of the chart after every N sprocket hole, a light-operated sensor producing a pulse upon passage of each sprocket hole, a light-operated sensor producing a pulse upon passage of each notch, means associated with said commutator supplying control signals indicating which of said input circuits is connected by said commutator, and circuit means controlled by said pulses and said control signals for influencing said trace-control means to hold the pen out of contact with the chart to prevent marking as described in claim
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) | 1974-09-13 | 1975-03-15 | 1975-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-13 | 1979-03-15 | 1979-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-13 | 1983-03-15 | 1983-09-14 | $7700.00 | Window Closed / Lapsed |