US3575515A — Beam of yarn sheet monitoring apparatus

Claim 1

Independent Claim 369 words

In yarn inspection apparatus for detecting broken yarns in a yarn sheet lying in a feed plane by detection of broken yarn ends moving through a selected inspection axis extending transversely of the yarn sheet and spaced to one side of the feed plane in a direction perpendicular thereto, the apparatus including air pressurized rectilinear elongated tube Means located to the opposite side of said feed plane from said inspection axis in parallelism therewith and transversely spanning the yarn sheet for discharging air toward the yarns to blow any broken yarn ends through said axis; an optical system producing a monitoring light beam along said inspection axis and spanning the yarn sheet comprising a detector head located outwardly adjacent one edge of the yarn sheet; said detector head including a lamp having a filament of selected size for producing light, a semitransparent mirror, and a lens system located along a first optical axis for projecting light from said lamp passing through said mirror and lens system in a first direction in a narrow cross section monitoring beam along said inspection axis, said detector head including a phototransistor located along a branch optical axis and intersecting the same at said mirror to receive light passing through said lens system toward said mirror in a direction opposite said first direction; a retroreflective target assembly located outwardly adjacent the opposite edge of the yearn sheet along said inspection axis including a substantially flat surface of retroreflective material of selected area facing the incident rays projected from said detector head lens system for retroreflecting incident rays of said beam striking said retroreflective material back along their incident ray paths, and a target lens in the path of incident rays of the beam projected by the detector head lens system and disposed in covering relation to said retroreflective surface, each of said detector head lens system and said target lens being adjustable along said inspection axis to provide a spot of light on the target lens having a maximum dimension which is only a fraction of the diameter of the target lens and the target lens being adjustable to reduce said spot of light to a smaller size light pattern on said retroreflective material.

Claim 2

Dependent Claim 369 words

In yarn inspection apparatus for detecting broken yarns in a yarn sheet lying in a feed plane by detection of broken yarn ends moving through a selected inspection axis extending transversely of the yarn sheet and spaced to one side of the feed plane in a direction perpendicular thereto, the apparatus including air pressurized rectilinear elongated tube Means located to the opposite side of said feed plane from said inspection axis in parallelism therewith and transversely spanning the yarn sheet for discharging air toward the yarns to blow any broken yarn ends through said axis; an optical system producing a monitoring light beam along said inspection axis and spanning the yarn sheet comprising a detector head located outwardly adjacent one edge of the yarn sheet; said detector head including a lamp having a filament of selected size for producing light, a semitransparent mirror, and a lens system located along a first optical axis for projecting light from said lamp passing through said mirror and lens system in a first direction in a narrow cross section monitoring beam along said inspection axis, said detector head including a phototransistor located along a branch optical axis and intersecting the same at said mirror to receive light passing through said lens system toward said mirror in a direction opposite said first direction; a retroreflective target assembly located outwardly adjacent the opposite edge of the yearn sheet along said inspection axis including a substantially flat surface of retroreflective material of selected area facing the incident rays projected from said detector head lens system for retroreflecting incident rays of said beam striking said retroreflective material back along their incident ray paths, and a target lens in the path of incident rays of the beam projected by the detector head lens system and disposed in covering relation to said retroreflective surface, each of said detector head lens system and said target lens being adjustable along said inspection axis to provide a spot of light on the target lens having a maximum dimension which is only a fraction of the diameter of the target lens and the target lens being adjustable to reduce said spot of light to a smaller size light pattern on said retroreflective material.

Claim 3

Dependent Claim 58 words

In yarn inspection apparatus an optical system as defined in claim 1, wherein said target assembly includes a mounting plate having a flat surface portion, said retroreflective material being supported on said flat surface portion, a lens tube for supporting said target lens, and an annular mount for movably supporting said lens tube and enshrouding said retroreflective material.

Claim 4

Dependent Claim 72 words

In yarn inspection apparatus, an optical system as defined in claim 1, wherein said detector head lens system comprises a biconcave lens disposed along said first optical axis for receiving light from said lamp transmitted through said semitransparent mirror and a planoconvex lens spaced along said first optical axis from said biconcave lens toward said target assembly for collecting light from the biconcave lens and focusing the same on said target lens.

Claim 5

Dependent Claim 72 words

In yarn inspection apparatus, an optical system as defined in claim 2, wherein said detector head lens system comprises a biconcave lens disposed along said first optical axis for receiving light from said lamp transmitted through said semitransparent mirror and a planoconvex lens spaced along said first optical axis from said biconcave lens toward said target assembly for collecting light from the biconcave lens and focusing the same on said target lens.

Claim 6

Dependent Claim 28 words

In yarn inspection apparatus, an optical system as defined in claim 1, wherein said target lens is a planoconvex lens having a diameter comparable to its focal length.

Claim 7

Dependent Claim 28 words

In yarn inspection apparatus, an optical system as defined in claim 2, wherein said target lens is a planoconvex lens having a diameter comparable to its focal length.

Claim 8

Dependent Claim 20 words

In yarn inspection apparatus, an optical system as defined in claim 3, wherein said target lens is a planoconvex lens.

Claim 9

Dependent Claim 28 words

In yarn inspection apparatus, an optical system as defined in claim 3, wherein said target lens is a planoconvex lens having a diameter comparable to its focal length.

Claim 10

Dependent Claim 42 words

In yarn inspection apparatus, an optical system as defined in claim 3, wherein said biconcave lens has a focal length of about -12.5 millimeters and said planoconvex lens of said detector head lens system has a focal length of about 75 millimeters.

Claim 11

Dependent Claim 24 words

In yarn inspection apparatus, an optical system as defined in claim 5, wherein said target lens has a focal length of about 50 millimeters.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1974-04-19	1974-10-19	1975-04-20	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1978-04-19	1978-10-19	1979-04-20	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1982-04-19	1982-10-19	1983-04-20	$7700.00	Window Closed / Lapsed

Beam of yarn sheet monitoring apparatus

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