US3821557A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for checking movable webs of paper synthetic material metal foils and the like
Assignee: Individual
•
Filing: 1973-03-12
•
Granted: 1974-06-28
•
Expires: 1993-03-12
Abstract
Abstract A device for checking a moving web in which a small beam of radiation is generated which is deflected by deflecting means which includes a small light-weight oscillating element so as to scan the moving web from side to side while radiation sensitive means is provided to intercept the beam as it leaves the web.
Inventors
- 👤 P Lipke
- 👤 R Hiemke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:10
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/84; G01N21/88; G01N21/89; G01N21/8901
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
165 words
A device for checking at least one quality of a web moving along a path comprising: a source of radiation and means for forming a beam of said radiation, beam deflecting means in the path of said beam and deflecting said beam toward one surface of the web, said deflector means including at least one oscillatable element of small mass and drive means for driving said element in oscillation, said element when oscillating causing that portion of said beam between said element and said web to oscillate laterally to the direction of movement of the web between predetermined limits whereby the web is scanned between said limits during movement of the web, and radiation sensitive means positioned to intercept the beam after impingement thereof on the web, said source being a light source and said deflecting means comprising mirror means, said mirror means comprising a plurality of mirrors and one of which forms said element, at least one of said mirrors being a convex mirror.
Claim 2
Independent Claim
165 words
A device for checking at least one quality of a web moving along a path comprising: a source of radiation and means for forming a beam of said radiation, beam deflecting means in the path of said beam and deflecting said beam toward one surface of the web, said deflector means including at least one oscillatable element of small mass and drive means for driving said element in oscillation, said element when oscillating causing that portion of said beam between said element and said web to oscillate laterally to the direction of movement of the web between predetermined limits whereby the web is scanned between said limits during movement of the web, and radiation sensitive means positioned to intercept the beam after impingement thereof on the web, said source being a light source and said deflecting means comprising mirror means, said mirror means comprising a plurality of mirrors and one of which forms said element, at least one of said mirrors being a convex mirror.
Claim 3
Dependent Claim
23 words
A device according to claim 1, in which a moving coil vibrator means serves as a drive means to oscillate said mirror means.
Claim 4
Dependent Claim
45 words
A device according to claim 1 in which said deflecting means directs said beam angularly toward the one surface of the web and the beam reflects off the web, said radiation sensitive means being on the same side of the web as said deflecting means.
Claim 5
Dependent Claim
62 words
A device according to claim 1 in which said mirror means directs the oscillating portion of said beam angularly toward the one surface of the web and said radiation sensitive means comprises photosensitive cell means distributed laterally to the direction of movement of the web and positioned to intercept the beam as the beam reflects from the one surface of the web.
Claim 6
Dependent Claim
22 words
A device according to claim 1 in which said element is a small mirror and said drive means comprises an electromagnetic vibrator.
Claim 7
Dependent Claim
13 words
A device according to claim 1 in which said source comprises a laser.
Claim 8
Dependent Claim
25 words
A device according to claim 1 in which said source is a source of light, and means for polarizing the beam formed from the light.
Claim 9
Dependent Claim
25 words
A device according to claim 1 in which said source is a source of light, and means for varying the wave length of said light.
Claim 10
Dependent Claim
36 words
A device according to claim 1 in which means for range of oscillation of said element is provided during scanning of the web over which correspondingly the speed of oscillation of the beam is substantially uniform.
Claim 11
Dependent Claim
34 words
A device according to claim 1 which includes more than one of said devices in side by side relation for checking webs wider than the width that can be scanned by a single device.
Claim 12
Dependent Claim
35 words
A device according to claim 1 in which said small mirror is flat and said beam is small in cross sectional area and falls first on said small mirror and then on said convex mirror.
Claim 13
Dependent Claim
60 words
A device According to claim 11 in which the beam reflecting off said convex mirror falls on another flat mirror and then again on said convex mirror, the beam when reflected the second time from said convex mirror falling on a still further flat mirror from which the beam is reflected angularly toward the one surface of the moving web.
Claim 14
Dependent Claim
41 words
A device according to claim 12 in which all of said mirrors extend transversely to the direction of movement of the web and said beam prior to falling on said mirror is parallel to the direction of movement of the web.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-27 | 1977-12-27 | 1978-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-27 | 1981-12-27 | 1982-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-27 | 1985-12-27 | 1986-06-28 | $7700.00 | Window Closed / Lapsed |