EP0266209A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Paper check device for a printer
Assignee: Brother Industries Ltd
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Filing: 1987-10-29
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Granted: —
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Expires: 2007-10-29
Abstract
Abstract A paper check device for a printer including paper feed means, a light emitter, a light receiver, reflectance determination means, and paper check means. The paper check means determines that a paper is not on the platen when the platen is detected to be moving and a determined reflectance is in a preset range for a time interval longer than another preset value. The paper check device correctly detects whether the paper is on the platen even if the paper with already printed patters of low reflectance is employed.
Inventors
- 👤 Kiyoshi Brother Kogyo K.K Takahashi
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 19:52
CPC Classifications
B; B41; B41J; B41J29/00; B41J29/42; B41J29/44; Y; Y10; Y10S; Y10S400/00; Y10S400/902
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
106 words
A paper check device for a printer having a platen (M1) and paper feed means (M3) for rotating the platen; the device including a light emitter (M4) for emitting light toward the platen; a light receiver (M5) for receiving light reflected from the platen or from paper (M2) on the platen; means (M6) for determining reflectance of light based on the emitted light and the received light; and paper check means (M7) for determining that the paper is not on the platen when the platen is being rotated and the determined reflectance is in a preset range for a time interval longer than a preset time.
Claim 2
Dependent Claim
106 words
A paper check device for a printer having a platen (M1) and paper feed means (M3) for rotating the platen; the device including a light emitter (M4) for emitting light toward the platen; a light receiver (M5) for receiving light reflected from the platen or from paper (M2) on the platen; means (M6) for determining reflectance of light based on the emitted light and the received light; and paper check means (M7) for determining that the paper is not on the platen when the platen is being rotated and the determined reflectance is in a preset range for a time interval longer than a preset time.
Claim 3
Dependent Claim
55 words
A paper check device according to claim 1, wherein the platen is made of dark material and the paper check means determines that the paper is not on the platen when the platen is being rotated and the determined reflectance is lower than a preset value for a time interval longer than the preset time.
Claim 4
Dependent Claim
37 words
A paper check device according to claim 1 or 2 wherein the device further comprises an alarm device which gives off an alarm when the paper check means determines that the paper is not on the platen.
Claim 5
Dependent Claim
24 words
A paper check device according to claim 1, 2 or 3 including paper feed means for rotating the platen as part of said device.
Claim 6
Dependent Claim
12 words
A printer including a paper check device according to any preceding claim.
Claim 7
Dependent Claim
47 words
A printer according to claim 5 wherein the paper check device is a device according to claim 3 and wherein the alarm device sets the printer in a de-select state and stops printing when the paper check means determines that the paper is not on the platen.
References Cited (Backward Citations)
No citation records indexed.
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