EP0033167A2
Expired / Lapsed
EP
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Device for the detection of sheet-like objects
Assignee: Canon Production Printing Netherlands BV
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Filing: 1981-01-02
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Granted: —
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Expires: 2001-01-02
Abstract
Abstract Device for the detection of a sheet-like object moving along a transport path (1). Both a light-sensitive element (10) and a light-emitting element (9) are arranged on one side of the transport path (1) and are each located in a channel (7, 8) which channels (7, 8) are not parallel to the plane of the transport path (1). Opposite said elements (9, 10) an optically-black chamber (12) is provided for making the device sensitive for all types of sheet-like materials.
Inventors
- 👤 Jan Bonne Stienstra
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-07 07:23
CPC Classifications
B; B65; B65H; B65H7/00; B65H7/02; B65H7/14; G; G01; G01V; G01V8/00; G01V8/10; G01V8/12
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
119 words
Device for the detection of a sheet-like object which moves along a transport path (1), in which a light-sensitive element (10) and a light-emitting element (9) are arranged on one side of the transport path (1), and the light-emitting (9) and the light-sensitive (10) elements are each located in a channel (7, 8), the axis lines of said channels (7, 8) being not at a right angle (a) with respect to the same perpendicular to the plane of the transport path (1), characterized in that the axis lines of the channels (7, 8) intersect in the plane of the transport path (1) and in that an optically-black chamber (12) is provided on the other side of the transport path.
Claim 2
Dependent Claim
119 words
Device for the detection of a sheet-like object which moves along a transport path (1), in which a light-sensitive element (10) and a light-emitting element (9) are arranged on one side of the transport path (1), and the light-emitting (9) and the light-sensitive (10) elements are each located in a channel (7, 8), the axis lines of said channels (7, 8) being not at a right angle (a) with respect to the same perpendicular to the plane of the transport path (1), characterized in that the axis lines of the channels (7, 8) intersect in the plane of the transport path (1) and in that an optically-black chamber (12) is provided on the other side of the transport path.
Claim 3
Dependent Claim
61 words
Device in accordance with claim 1, characterized in that the height of the transport path (1) is at its maximum identical with the product of the main dimension of the section of each channel (7, 8) and the sinus of the angle (a) which the axes of the channels enclose with the perpendicular to the plane of the transport path (1).
Claim 4
Dependent Claim
62 words
Device in accordance with claim 1 or 2, characterized in that the light-emitting element (9) is connected to an alternating voltage source (20) with a frequency of at least 100 Hz and in that in the detection circuit of the light-sensitive element (10) a low frequency filter (22) is incorporated which is matched to the frequency of the alternating voltage source (20).
Claim 5
Dependent Claim
22 words
Device in accordance with claim 3, characterized in that the alternating voltage source (20) has a frequency between 1 and 5 kHz.
Claim 6
Dependent Claim
39 words
Device in accordance with claim 3 or 4, characterized in that a high frequency filter (23) which is matched to the frequency of the alternating voltage source (20) is incorporated in the detection circuit of the light-sensitive element (10).
References Cited (Backward Citations)
No citation records indexed.
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