Patent US4229645A successfully refreshed from Google Patents.
US4229645A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Detector and recorder of holes and disruptions in plastic material sheets and webs
Assignee: Anic SpA
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Filing: 1978-05-15
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Granted: 1980-10-21
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Expires: 1998-05-15
Abstract
Abstract A device is disclosed for continuously counting up the pinholes and the rips (continuous disruptions) in a film or web of plastic materials, said device having a gating circuit which is capable of distinguishing the pinholes from the rips thus giving a more reliable indication than was possible with the conventional devices also based on detection of electric discharges.
Inventors
- 👤 Carlo Vigano
- 👤 Francesco Quattrone
- 👤 Erio Toffanetti
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:39
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/02; G01N27/04; G01N27/20; G01N27/205
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
166 words
A device for detecting pin holes on moving films or webs of plastic materials comprising: a high voltage electrode and a grounded roller between which the web passes during coiling; means coupled to the roller for detecting pin holes in the web based on electrical discharges; and means for counting rips in the web, said rip counting means including an inhibiting device coupled to said detecting means and comprising a flip-flop, a first counter for recording pin holes by counting discrete electrical discharges, a second counter for recording consecutive electrical discharges indicative of a rip, gating means responsive to said flip-flop for coupling signals of said detecting means to said first and said second counters, said gating means including means responsive to a rate of occurrence of consecutive discharges to set said flip-flop for switching signals of said detecting means to the second counter, and means for resetting the flip-flop to signal discrete discharges after a preselected length of film having no defects has run past.
Claim 2
Independent Claim
166 words
A device for detecting pin holes on moving films or webs of plastic materials comprising: a high voltage electrode and a grounded roller between which the web passes during coiling; means coupled to the roller for detecting pin holes in the web based on electrical discharges; and means for counting rips in the web, said rip counting means including an inhibiting device coupled to said detecting means and comprising a flip-flop, a first counter for recording pin holes by counting discrete electrical discharges, a second counter for recording consecutive electrical discharges indicative of a rip, gating means responsive to said flip-flop for coupling signals of said detecting means to said first and said second counters, said gating means including means responsive to a rate of occurrence of consecutive discharges to set said flip-flop for switching signals of said detecting means to the second counter, and means for resetting the flip-flop to signal discrete discharges after a preselected length of film having no defects has run past.
Claim 3
Dependent Claim
43 words
A device in accordance with claim 1 further including: means for supplying voltage pulses to the electrode at a frequency which varies in accordance with the feed speed of the web, and, means for counting the length of the web passing the electrode.
Claim 4
Dependent Claim
36 words
A device in accordance with claim 2 further including: a control logic circuit coupled to the counting means and a print-out apparatus controlled by said logic circuit to provide a printed count of pinholes and rips.
Claim 5
Dependent Claim
40 words
A device in accordance with claim 2 wherein: the means for detecting pin holes comprises a transformer, and the device further includes a governor for controlling the frequency of high voltage pulses to the electrode to provide the desired sensitivity.
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) | 1983-10-21 | 1984-04-21 | 1984-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-10-21 | 1988-04-21 | 1988-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-10-21 | 1992-04-21 | 1992-10-21 | $7700.00 | Window Closed / Lapsed |