Patent EP0053728A1 successfully refreshed from Google Patents.
EP0053728A1
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EP
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Apparatus for detecting defects of printing sheets
Assignee: Komori Corp
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Filing: 1981-10-31
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Granted: —
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Expires: 2001-10-31
Abstract
Abstract Such defects as a folded back or bent portion and a notch along one or both side edges of a printing sheet is detected by a detector located on one or both sides of a front edge of a correctly fed printing sheet for detecting absence of the sheet and a timing signal generator which produces a timing signal while all length of the sheet passes by the detector. An output signal which stops printing operation is produced when the detector detects absence of the sheet while the timing signal is being produced. According to this invention it is possible to prevent formation of defective printed matter and damage of a printing press fed with defective printing sheets.
Inventors
- 👤 Chiyomatsu Uno
- 👤 Tamio Kuroda
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 04:50
CPC Classifications
B; B65; B65H; B65H7/00; B65H7/02; B65H7/14; B41; B41F; B41F33/00; B41F33/04; B41F33/14; B65H7/06
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
117 words
Apparatus for detecting defects at a side edge of a printing sheet (2) comprising: a) a detector (20; 35; 44, 45) provided at one side of a front edge of a correctly fed printing sheet (2) for detecting presence or absence of said printing sheet (2); b) a detection timing means (28, 30, 32) for producing a detection timing signal (b) while all length of said printing sheet (2) passes by said detector (20; 35; 44; 45); and c) means (37; 42, 46, 47, 49; 55) for producing an output signal (e; h; k) when said detector (20; 35; 44, 45) detects absence of said printing sheet (2) while said detection timing signal (b) is being produced.
Claim 2
Dependent Claim
117 words
Apparatus for detecting defects at a side edge of a printing sheet (2) comprising: a) a detector (20; 35; 44, 45) provided at one side of a front edge of a correctly fed printing sheet (2) for detecting presence or absence of said printing sheet (2); b) a detection timing means (28, 30, 32) for producing a detection timing signal (b) while all length of said printing sheet (2) passes by said detector (20; 35; 44; 45); and c) means (37; 42, 46, 47, 49; 55) for producing an output signal (e; h; k) when said detector (20; 35; 44, 45) detects absence of said printing sheet (2) while said detection timing signal (b) is being produced.
Claim 3
Dependent Claim
46 words
The apparatus according to claim 1 wherein said detector (20; 35; 44, 45) comprises light emitting means (20a; 35a) and light receiving means (20b; 35b) which receives light emitted by said light emitting means (20a; 35a) and transmitted through of reflected by said printing sheet (2).
Claim 4
Dependent Claim
102 words
The apparatus according to claim 1 or 2 wherein said detection timing means (28, 30, 32) comprises a sector shaped member (28, 30) rotated one revolution when a printing sheet (2) is fed to a printing press, and a timing sensor (32) disposed to face a peripheral portion (28a, 30a) of said sector shaped member (28, 30) for producing said detection timing signal (b) while said peripheral portion (28a, 30a) passes by said timing sensor (32), said peripheral portion (28a, 30a) having a length corresponding to a time in which said printing sheet (2) passes by said detector (20; 35; 44, 45).
Claim 5
Dependent Claim
20 words
The apparatus according to claim 3 wherein said sector shaped member (28, 30) comprises two sectors which are adjustably overlapped.
Claim 6
Independent Claim
67 words
The apparatus according to one of the claims 1, 3 or 4, wherein said detector (20; 35; 44, 45) comprises an electroconductive feed plate (44) on which said printing sheet (2) is correctly fed, and an electroconductive member (45) urged upon said printing sheet (2) whereby when said sheet (2) contains a defective portion electric current flows between said feed plate (44) and said electroconductive member (45).
Claim 7
Dependent Claim
58 words
The apparatus according to claim 5 which further comprises a first switch (46) which is held closed during printing operation of a printing press and a second switch (47) which is closed by said detection timing signal, said first and second switches (46, 47) being connected in series with said electroconductive member (45) for producing said output signal.
References Cited (Backward Citations)
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