JPS568157A - Safety device - Google Patents
Safety deviceInfo
- Publication number
- JPS568157A JPS568157A JP7401680A JP7401680A JPS568157A JP S568157 A JPS568157 A JP S568157A JP 7401680 A JP7401680 A JP 7401680A JP 7401680 A JP7401680 A JP 7401680A JP S568157 A JPS568157 A JP S568157A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- signals
- abnormality
- control signals
- timing
- 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.)
- Granted
Links
Landscapes
- Control Or Security For Electrophotography (AREA)
Abstract
PURPOSE:To enhance reliability and safety of a drum type or reciprocating type electrophotographic copying machine, by detecting abnormality of timing signals as the base for forming control signals. CONSTITUTION:A signal-producing source, such as a magnetic tape with pulse signals recorded at equal intervals is provided on a rotary body for driving a photoreceptor, such as photosensitive drum 4. Signals from this source is detected, amplified, and shaped with detecting circuit 18 to form timing pulses, and further, verious kinds of control signals are formed in control signal forming circuit 21. Fail-safe circuit 20 is provided, and receives the output of circuit 18 to detect whether the time length of each timing pulse is normal or not. When abnormality is detected, circuit 20 displays the abnormality and stops the outputs of control signals, thus permitting reliability and safety of the copier to be enhanced.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP55074016A JPS5952426B2 (en) | 1980-06-02 | 1980-06-02 | Safety device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP55074016A JPS5952426B2 (en) | 1980-06-02 | 1980-06-02 | Safety device |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP6241773A Division JPS5723260B2 (en) | 1973-06-01 | 1973-06-01 |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS568157A true JPS568157A (en) | 1981-01-27 |
JPS5952426B2 JPS5952426B2 (en) | 1984-12-19 |
Family
ID=13534877
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP55074016A Expired JPS5952426B2 (en) | 1980-06-02 | 1980-06-02 | Safety device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5952426B2 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59113453A (en) * | 1982-12-20 | 1984-06-30 | Ricoh Co Ltd | Copying machine |
JPS59212852A (en) * | 1983-05-18 | 1984-12-01 | Fuji Xerox Co Ltd | Abnormality detector of copying machine |
JPS59212853A (en) * | 1983-05-18 | 1984-12-01 | Fuji Xerox Co Ltd | Abnormality detector of copying machine |
JPS6190171A (en) * | 1984-10-09 | 1986-05-08 | Fuji Xerox Co Ltd | Detection method of latent image position on photosensitive belt |
-
1980
- 1980-06-02 JP JP55074016A patent/JPS5952426B2/en not_active Expired
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59113453A (en) * | 1982-12-20 | 1984-06-30 | Ricoh Co Ltd | Copying machine |
JPH0581900B2 (en) * | 1982-12-20 | 1993-11-16 | Ricoh Kk | |
JPS59212852A (en) * | 1983-05-18 | 1984-12-01 | Fuji Xerox Co Ltd | Abnormality detector of copying machine |
JPS59212853A (en) * | 1983-05-18 | 1984-12-01 | Fuji Xerox Co Ltd | Abnormality detector of copying machine |
JPS6190171A (en) * | 1984-10-09 | 1986-05-08 | Fuji Xerox Co Ltd | Detection method of latent image position on photosensitive belt |
Also Published As
Publication number | Publication date |
---|---|
JPS5952426B2 (en) | 1984-12-19 |
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