JPS5681414A - Detecting device for length of paper leaf - Google Patents
Detecting device for length of paper leafInfo
- Publication number
- JPS5681414A JPS5681414A JP15804979A JP15804979A JPS5681414A JP S5681414 A JPS5681414 A JP S5681414A JP 15804979 A JP15804979 A JP 15804979A JP 15804979 A JP15804979 A JP 15804979A JP S5681414 A JPS5681414 A JP S5681414A
- Authority
- JP
- Japan
- Prior art keywords
- paper leaf
- counters
- counter
- counting
- photoelectric
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Length Measuring Devices By Optical Means (AREA)
Abstract
PURPOSE: To determine the exact length of the paper leaf by a method wherein the counts of the transit period of the front and rear edges of the paper leaf are detected by four phototransmission-type detectors arranged in parallel and perpendicularly to the direction of carriage of the paper leaf and at somewhat shorter intervals than the sizes thereof and are processed by a comprehensive determination circuit and thereby the tilt and corner fold of the paper leaf are checked up.
CONSTITUTION: Light sources 1W4 and photoelectric elements 1'W4' are arranged perpendicularly and in parallel to the direction of carriage of the paper leaf P shown by an arrow and at some-what smaller intervals than the sizes of P. The output of the photoelectric elenent 1'W4' is inputted to counters 17W20 through amplifiers 5W8, detecting circuits 9W12 and logical sum circuits 13W16, respectively. When the tip of P reaches the photoelectric element 3', for instance, the counters 18 and 19 start counting, and when the tip of P reaches 4', the counter 18 stops counting, while the counter 20 starts counting. When the rear edge of P passes 1', for instance, the counter 17 starts counting, while the counter 19 stops. When the rear edge of P passes 2', the counters 17 and 20 stop. Receiving count signals AWD from these counters, the comprehensive determination circuit 21 checks up the tilt and corner fold of P and determines the exact length thereof.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15804979A JPS5681414A (en) | 1979-12-07 | 1979-12-07 | Detecting device for length of paper leaf |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15804979A JPS5681414A (en) | 1979-12-07 | 1979-12-07 | Detecting device for length of paper leaf |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5681414A true JPS5681414A (en) | 1981-07-03 |
Family
ID=15663168
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP15804979A Pending JPS5681414A (en) | 1979-12-07 | 1979-12-07 | Detecting device for length of paper leaf |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5681414A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007004137A (en) * | 2005-05-27 | 2007-01-11 | Canon Inc | Image forming apparatus |
US20100134551A1 (en) * | 2008-12-02 | 2010-06-03 | Canon Kabushiki Kaisha | Printing apparatus |
-
1979
- 1979-12-07 JP JP15804979A patent/JPS5681414A/en active Pending
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007004137A (en) * | 2005-05-27 | 2007-01-11 | Canon Inc | Image forming apparatus |
US20100134551A1 (en) * | 2008-12-02 | 2010-06-03 | Canon Kabushiki Kaisha | Printing apparatus |
US8419155B2 (en) * | 2008-12-02 | 2013-04-16 | Canon Kabushiki Kaisha | Printing apparatus |
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