EP0363153A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Sheet edge detector
Assignee: Xerox Corp
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Filing: 1989-10-03
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Granted: —
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Expires: 2009-10-03
Abstract
Abstract An apparatus which determines the location of an edge of an advancing sheet and discriminates between the edge and a hole in the sheet. After the leading edge of the sheet is detected by a sensor (108) and the sheet has moved a first predetermined distance, the absence or presence of the sheet is sensed for a second predetermined distance. If the sheet is not detected as it moves the second predetermined distance, the control logic (114) indicates that the trailing edge has been detected. In the event the sheet is sensed, the control logic indicates that a hole has been detected and the process is repeated to locate the trailing edge.
Inventors
- 👤 Barbara A. Sampath
- 👤 Richard C. Schenk
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-04 19:09
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/65; G03G15/6588; B; B65; B65H; B65H7/00; B65H7/02; B65H7/06; B65H7/14; B65H2301/00; B65H2301/30; B65H2301/33; B65H2301/333; B65H2301/3331; B65H2301/33312; B65H2511/00; B65H2511/10; B65H2511/16; B65H2511/20; B65H2511/50; B65H2511/51; B65H2511/514; B65H2511/515; B65H2515/00; B65H2515/60; B65H2553/00; B65H2553/40; B65H2553/41; B65H2553/412; B65H2701/00; B65H2701/10; B65H2701/13; B65H2701/131; B65H2701/1311; B65H2701/1313; G03G2215/00; G03G2215/00362; G03G2215/00367; G03G2215/00417; G03G2215/00421; G03G2215/0043; G03G2215/00438; G03G2215/00443; G03G2215/00523; G03G2215/00535; G03G2215/00611; G03G2215/00616; G03G2215/00687; G03G2215/007; G03G2215/00717; G03G2215/00721
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
45 words
An apparatus for determining the location of an edge of a sheet, including: means 102, 116, 118 for advancing the sheet; and characterised by means 108, 114 for distinguishing between the edge of the sheet 146 and a hole 150 in the marginal region thereof.
Claim 2
Independent Claim
45 words
An apparatus for determining the location of an edge of a sheet, including: means 102, 116, 118 for advancing the sheet; and characterised by means 108, 114 for distinguishing between the edge of the sheet 146 and a hole 150 in the marginal region thereof.
Claim 3
Dependent Claim
117 words
An apparatus according to claim 1, wherein said distinguishing means includes: control logic 114; and means 108, coupled to said control logic, for detecting the sheet 146, said sheet detecting means sensing the presence of the leading edge of the sheet and, after the sheet advances about a first predetermined distance, the absence of the sheet and transmitting signals corresponding thereto to said control logic, said control logic indicating that the absence of the sheet, after the sheet has advanced about the first predetermined distance, corresponds to the location of the trailing edge of the sheet when said detecting means continues to sense the absence of the sheet as the sheet advances about a second predetermined distance.
Claim 4
Dependent Claim
38 words
An apparatus according to claim 2, wherein said control logic indicates the presence of a hole in the sheet when said detecting means detects the presence of the sheet 146 as the sheet advances the second predetermined distance.
Claim 5
Dependent Claim
27 words
An apparatus according to claim 2 or claim 3, wherein said detecting means includes a photosensor 142, 152 for detecting the presence and absence of the sheet.
Claim 6
Dependent Claim
88 words
An apparatus according to claim 4, wherein said photosensor includes: a light source 142; and a light detector 152 positioned to receive the light rays from said light source and generating a signal when the light rays from said light source are transmitted thereto, said advancing means being adapted to move the sheet between said light source and said light detector so that, when the sheet is interposed between said light source and said light detector, the light rays from said light source are blocked by the sheet.
Claim 7
Dependent Claim
24 words
An apparatus according to claim 5, wherein: said light source 142 includes a light emitting diode; and said light detector 152 includes a photodiode.
Claim 8
Dependent Claim
36 words
An electrophotographic printing machine of the type in which it is necessary to discriminate between an edge of the copy sheet and a hole therein, including the apparatus of any one of claims 1 to 6.
Claim 9
Dependent Claim
31 words
A printing machine according to claim 7, further including means 110, 112, responsive to control logic indicating that the trailing edge of the sheet has been detected, for inverting the sheet.
Claim 10
Independent Claim
34 words
A method of determining the edge of a sheet, including the steps of: advancing the sheet; and characterised by distinguishing between the edge of the sheet and a hole in the marginal region thereof.
Claim 11
Independent Claim
34 words
A method of determining the edge of a sheet, including the steps of: advancing the sheet; and characterised by distinguishing between the edge of the sheet and a hole in the marginal region thereof.
Claim 12
Dependent Claim
119 words
A method according to claim 14, wherein said step of distinguishing includes the steps of: detecting the presence of the leading edge of the sheet and, after the sheet advances about a first predetermined distance, the absence of the sheet; and indicating that the absence of the sheet, after the sheet has advanced about the first predetermined distance, corresponds to the location of the trailing edge of the sheet when the absence of the sheet is continued to be sensed as the sheet advances about a second predetermined distance, wherein said step of indicating indicates the presence of a hole in the sheet when the presence of the sheet is sensed as the sheet advances the second predetermined distance.
References Cited (Backward Citations)
No citation records indexed.
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