Patent US3604941A successfully refreshed from Google Patents.
US3604941A
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System for sensing indicia on moving members
Assignee: Harris Graphics Corp
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Filing: 1969-11-18
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Granted: 1971-09-14
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Expires: 1989-11-18
Abstract
Abstract A system for sensing a register mark, or other indicia, which, for example, may be associated with a high-speed web-fed printing press, provides a signal which indicates the passage of the register mark past a conventional sensor. The signal from a conventional amplifier coupled to the sensor is coupled through an operational amplifier that has a varistor connected between its inverting input and its output to an emitter-follower circuit that has a threshold adjustment resistor in its emitter path to ground. The output of the emitter-follower circuit is coupled to an RC differentiating circuit and the differentiating circuit is coupled to a second operational amplifier. The second operational amplifier has a Zener diode connected between its inverting input and its output and it produces an output voltage which is close to ground when the differentiated signal is of one polarity and an output pulse signal which is independent of width of the sensed signal, and which occurs essentially simultaneously with the occurrence of a peak magnitude of the sensed signal which is provided by the conventional sensor-amplifier combination, when the differentiated signal changes to the other polarity.
Inventors
- 👤 James N Crum
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:51
CPC Classifications
H; H03; H03K; H03K5/00; H03K5/153; H03K5/1532; B; B65; B65H; B65H23/00; B65H23/04; B65H23/046; H03K5/1536
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
107 words
In an indicia-sensing system for sensing indicia on a moving member; sensing means for producing a first time variable level signal which changes from a first level in a first direction to a peak level and then back in a second direction toward said first level on relative movement of the indicia and the sensing means past each other, means for differentiating the first signal produced by the sensing means to obtain a differentiated signal and means responsive to the differentiated signal for producing an output pulse having its leading edge occurring substantially at the point in time when the first signal has reached its peak level.
Claim 2
Dependent Claim
107 words
In an indicia-sensing system for sensing indicia on a moving member; sensing means for producing a first time variable level signal which changes from a first level in a first direction to a peak level and then back in a second direction toward said first level on relative movement of the indicia and the sensing means past each other, means for differentiating the first signal produced by the sensing means to obtain a differentiated signal and means responsive to the differentiated signal for producing an output pulse having its leading edge occurring substantially at the point in time when the first signal has reached its peak level.
Claim 3
Dependent Claim
30 words
In an indicia-sensing system as defined in claim 1 means to prevent the first signal from being coupled to the differentiating means until the first signal crosses a predetermined level.
Claim 4
Dependent Claim
55 words
In an indicia-sensing system as defined in claim 1, a system wherein the differentiated signal undergoes a change of polarity with respect to a reference polarity level and the leading edge of the output pulse occurs substantially when the differentiated signal crosses the reference polarity level and the first signal has reached its peak level.
Claim 5
Dependent Claim
55 words
In an indicia-sensing system as defined in claim 2, a system wherein the differentiated signal undergoes a change of polarity with respect to a reference polarity level and the leading edge of the output pulse occurs substantially when the differentiated signal crosses the reference polarity level and the first signal has reached its peak level.
Claim 6
Dependent Claim
132 words
In s system or sensing register marks on a moving web, a light-source means for directing light onto the register marks and the web, optical sensing means for producing a first time variable level signal pulse which changes in a first direction from a First level to a peak level and then back in a second direction toward said first level in response to the light received by the optical sensing means from a register mark on the web as it moves past the optical sensing means, means for differentiating the first pulse signal to obtain a differentiated signal and means responsive to the differentiated signal for producing an output pulse having its leading edge occurring substantially at the point in time when the first signal pulse has reached its peak level.
Claim 7
Dependent Claim
132 words
In s system or sensing register marks on a moving web, a light-source means for directing light onto the register marks and the web, optical sensing means for producing a first time variable level signal pulse which changes in a first direction from a First level to a peak level and then back in a second direction toward said first level in response to the light received by the optical sensing means from a register mark on the web as it moves past the optical sensing means, means for differentiating the first pulse signal to obtain a differentiated signal and means responsive to the differentiated signal for producing an output pulse having its leading edge occurring substantially at the point in time when the first signal pulse has reached its peak level.
Claim 8
Dependent Claim
53 words
In an indicia-sensing system as defined in claim 5 means to prevent the first signal from being coupled to the differentiating means until the first signal crosses a predetermined level, wherein the predetermined level is a threshold level that prevents erroneous signals caused by optical conditions from being coupled to the differentiating means.
Claim 9
Dependent Claim
61 words
In an indicia-sensing system as defined in claim 5, s system wherein the differentiated signal is a voltage signal which undergoes a change of polarity with respect to a reference polarity level and the leading edge of the output pulse occurs substantially when the differentiated signal crosses the reference polarity level and the first signal pulse has reached its peak level.
Claim 10
Dependent Claim
61 words
In an indicia-sensing system as defined in claim 6, a system wherein the differentiated signal is a voltage signal which undergoes a change of polarity with respect to a reference polarity level and the leading edge of the output pulse occurs substantially when the differentiated signal crosses the reference polarity level and the first signal pulse has reached its peak level.
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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) | 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 |